the process in which a gas changes directly to a solid or from a solid directly into a gas is called???
Q. sublimation crystallization efflorescence deliquescence also, Calcium chloride is an example is sublimation crystallization efflorescence deliquescence also, Hydrogen peroxide is H2O2 decomposes rapidly is household bleach all of these
Asked by Robyn F - Sun Jul 13 14:54:25 2008 - - 2 Answers - 0 Comments
A. A solid going directly to a gas is "sublimation". The reverse of sublimation is "deposition". Calcium chloride does not undergo sublimation, but it does pick up water from the air. Efflorescence is the loss of water from a hydrated substance. This can happen to CaCl2 after it has picked up water. Deliquescence is when a substance picks up so much water from the air that the solid dissolves in the water. Calcium chloride is deliquescent. Hydrogen peroxide is indeed H2O2, it can decompose readily and it can function as a bleach.
Answered by pisgahchemist - Sun Jul 13 15:12:18 2008
Q. sublimation crystallization efflorescence deliquescence also, Calcium chloride is an example is sublimation crystallization efflorescence deliquescence also, Hydrogen peroxide is H2O2 decomposes rapidly is household bleach all of these
Asked by Robyn F - Sun Jul 13 14:54:25 2008 - - 2 Answers - 0 Comments
A. A solid going directly to a gas is "sublimation". The reverse of sublimation is "deposition". Calcium chloride does not undergo sublimation, but it does pick up water from the air. Efflorescence is the loss of water from a hydrated substance. This can happen to CaCl2 after it has picked up water. Deliquescence is when a substance picks up so much water from the air that the solid dissolves in the water. Calcium chloride is deliquescent. Hydrogen peroxide is indeed H2O2, it can decompose readily and it can function as a bleach.
Answered by pisgahchemist - Sun Jul 13 15:12:18 2008
when we're at the space without a special suit our blood boils.. is it hot or just change into gas?
Q. When we go to the space we need a special suit cus up there there's no any air, and our body needs certain atmospheric pressure to survive, so that pressure is provided by the special suit. Now, as we know this pressure helps some elements to stay in certain state, for example some materials are liquids because of this pressure that keeps it's molecules together, and as we know, the closer the molecules are the more solid the material gets... and viceversa, when the molecules are far enough it becomes gas. According to what I know when we go to the space there's no any pressure on or molecules to keep them together together right ? so our blood starts to boils, cus the molecules start getting further one from the others... the same things… [cont.]
Asked by Nevermind7694 - Sun Jul 19 12:19:50 2009 - - 3 Answers - 0 Comments
A. Boiling point decreases with Pressure. Since there is no pressure the boiling point drops to 0.
Answered by unknown - Sun Jul 19 12:24:44 2009
Q. When we go to the space we need a special suit cus up there there's no any air, and our body needs certain atmospheric pressure to survive, so that pressure is provided by the special suit. Now, as we know this pressure helps some elements to stay in certain state, for example some materials are liquids because of this pressure that keeps it's molecules together, and as we know, the closer the molecules are the more solid the material gets... and viceversa, when the molecules are far enough it becomes gas. According to what I know when we go to the space there's no any pressure on or molecules to keep them together together right ? so our blood starts to boils, cus the molecules start getting further one from the others... the same things… [cont.]
Asked by Nevermind7694 - Sun Jul 19 12:19:50 2009 - - 3 Answers - 0 Comments
A. Boiling point decreases with Pressure. Since there is no pressure the boiling point drops to 0.
Answered by unknown - Sun Jul 19 12:24:44 2009
if work is done on a system during an adiabatic process, does the internal energy of the system increase?
Q. (ie. does the system heat up?) a. Yes, work done On a system adds energy to it, and if that energu is not lost, it goes directly into the system's internal energy. b. No. as an example, enough work done to compress a gas will turn it into a frozen solid. c. No. work dones on a system is equal to negative work done by the system, therefore energy is removed from the system. d. yes. even though the work done removes heat from the system, the amount o heat absorbed form outside of the system wil compensate. can you help me with this physic question? thanks a lot!!! (ie. does the system heat up?) a. Yes, work done On a system adds energy to it, and if that energu is not lost, it goes directly into the system's internal energy. b. No. as an… [cont.]
Asked by cute_ami - Thu Aug 10 18:27:22 2006 - - 2 Answers - 0 Comments
A. "Adiabatic" means that no heat passes into the system. Since change in heat=change in internal energy+work done by system and the work is done ON the system (making the work done BY the system less than zero), the change in internal energy must be postitve. So yes, the internal energy will increase.
Answered by Benjamin N - Thu Aug 10 19:03:44 2006
Q. (ie. does the system heat up?) a. Yes, work done On a system adds energy to it, and if that energu is not lost, it goes directly into the system's internal energy. b. No. as an example, enough work done to compress a gas will turn it into a frozen solid. c. No. work dones on a system is equal to negative work done by the system, therefore energy is removed from the system. d. yes. even though the work done removes heat from the system, the amount o heat absorbed form outside of the system wil compensate. can you help me with this physic question? thanks a lot!!! (ie. does the system heat up?) a. Yes, work done On a system adds energy to it, and if that energu is not lost, it goes directly into the system's internal energy. b. No. as an… [cont.]
Asked by cute_ami - Thu Aug 10 18:27:22 2006 - - 2 Answers - 0 Comments
A. "Adiabatic" means that no heat passes into the system. Since change in heat=change in internal energy+work done by system and the work is done ON the system (making the work done BY the system less than zero), the change in internal energy must be postitve. So yes, the internal energy will increase.
Answered by Benjamin N - Thu Aug 10 19:03:44 2006
How would you answer these questions?
Q. Hey i have a few chemistry questions that i dont really understand..please help thanks :) true or false.. 1.unsaturated oils can be detected by bromine water turning from orange to blue. 2. Solid fats tend to be solids at room temperature 3. Emulsions are mixtures of liquids 4. The word immiscible means the same as insoluble 5. Milk is an emulsion of fats and water 6. An example of a type of E-number is an emulsifier fill in the gaps... 1.Sometimes steam ___ is used because it does not raise the temperature too far. 2. An example of an oil extracted using this method is___ oil which is used in perfumes and bath product. 3. Vegetable oils are very important in our diets because they contain a great deal of ___. 4. Many vegetable oils… [cont.]
Asked by kong - Sat Jun 27 06:06:10 2009 - - 5 Answers - 0 Comments
A. Twenty two different questions!!! ... I think you are abusing the points saystem of this site. For paying your points, you are allowed to ask a question or two. I really think you are trying to push peoples goodwill in helping. Sorry. Post them properly and you'll get more response. twenty two different questions for one lot of your asking points!!!
Answered by unknown - Sat Jun 27 07:26:41 2009
Q. Hey i have a few chemistry questions that i dont really understand..please help thanks :) true or false.. 1.unsaturated oils can be detected by bromine water turning from orange to blue. 2. Solid fats tend to be solids at room temperature 3. Emulsions are mixtures of liquids 4. The word immiscible means the same as insoluble 5. Milk is an emulsion of fats and water 6. An example of a type of E-number is an emulsifier fill in the gaps... 1.Sometimes steam ___ is used because it does not raise the temperature too far. 2. An example of an oil extracted using this method is___ oil which is used in perfumes and bath product. 3. Vegetable oils are very important in our diets because they contain a great deal of ___. 4. Many vegetable oils… [cont.]
Asked by kong - Sat Jun 27 06:06:10 2009 - - 5 Answers - 0 Comments
A. Twenty two different questions!!! ... I think you are abusing the points saystem of this site. For paying your points, you are allowed to ask a question or two. I really think you are trying to push peoples goodwill in helping. Sorry. Post them properly and you'll get more response. twenty two different questions for one lot of your asking points!!!
Answered by unknown - Sat Jun 27 07:26:41 2009
I need a good example of sublimaton?
Q. Becides dry ice Sublimation is when a solid directly changes into a gas. What about iodine, what does it do ?
Asked by Deitrick - Wed Oct 3 14:51:46 2007 - - 2 Answers - 0 Comments
A. Iodine is the other classic example
Answered by Chemmunicator - Wed Oct 3 14:57:00 2007
Q. Becides dry ice Sublimation is when a solid directly changes into a gas. What about iodine, what does it do ?
Asked by Deitrick - Wed Oct 3 14:51:46 2007 - - 2 Answers - 0 Comments
A. Iodine is the other classic example
Answered by Chemmunicator - Wed Oct 3 14:57:00 2007
Please answer my science question?
Q. Upon heating, ice can melt and turn into a liquid. This is an example of--- a)solid gas b)water gas c)no change d)chemical change e)physical change
Asked by MOMMY - Fri Sep 18 14:41:01 2009 - - 3 Answers - 0 Comments
Q. Upon heating, ice can melt and turn into a liquid. This is an example of--- a)solid gas b)water gas c)no change d)chemical change e)physical change
Asked by MOMMY - Fri Sep 18 14:41:01 2009 - - 3 Answers - 0 Comments
2. The atmosphere of Earth is an example of a ____ solution.?
Q. liquid-liquid gas-liquid gas-gas solid-liquid Which of the following will cause a greater amount of oxygen to dissolve in 100 g of water? Heat the water. Decrease the oxygen gas pressure. Increase the oxygen gas pressure. all of the above 4. Which of the following mixtures is NOT an example of a substance? drinking water air brass pizza 5. The amount of table sugar that will dissolve in 1 kg of water can be increased by ___. stirring the solution heating the solution breaking the sugar into smaller pieces doing any of the above 6. A solution with a pH of 13 is a ___. weak acid weak base strong acid strong base
Asked by XxmilkywayyxX - Thu Apr 23 10:22:13 2009 - - 3 Answers - 0 Comments
A. gas-gas in crease oxygen pressure (increasing heat decreases solubility of a gas) pizza (it is a heterogeneous mixture, the others are homogeneous) doing any of the above strong base
Answered by AndrewG - Mon Apr 27 03:25:22 2009
Q. liquid-liquid gas-liquid gas-gas solid-liquid Which of the following will cause a greater amount of oxygen to dissolve in 100 g of water? Heat the water. Decrease the oxygen gas pressure. Increase the oxygen gas pressure. all of the above 4. Which of the following mixtures is NOT an example of a substance? drinking water air brass pizza 5. The amount of table sugar that will dissolve in 1 kg of water can be increased by ___. stirring the solution heating the solution breaking the sugar into smaller pieces doing any of the above 6. A solution with a pH of 13 is a ___. weak acid weak base strong acid strong base
Asked by XxmilkywayyxX - Thu Apr 23 10:22:13 2009 - - 3 Answers - 0 Comments
A. gas-gas in crease oxygen pressure (increasing heat decreases solubility of a gas) pizza (it is a heterogeneous mixture, the others are homogeneous) doing any of the above strong base
Answered by AndrewG - Mon Apr 27 03:25:22 2009
Help me please science homework solids liquids gas?
Q. Please help me with these questions, I can't find it online: Questions - This is a solid that might form when two solutions are mixed - One of their goals was to turn base metals into gold - Tomato juice is an example of this - These mixtures are heterogeneous, but do not settle - This statement summarizes a pattern of many observations iron and nickel are examples of this -Mechanical mixtures and suspensions share this property -In ancient Greece, these persons though about sustances in the world -This type of change produces new substances -Daltion suggested that atoms of different elsements combine this
Asked by Random Person - Wed Mar 25 05:16:58 2009 - - 1 Answers - 0 Comments
A. Those arent questions, more like clues. Rephrase?
Answered by rafaledeguerre - Wed Mar 25 05:32:03 2009
Q. Please help me with these questions, I can't find it online: Questions - This is a solid that might form when two solutions are mixed - One of their goals was to turn base metals into gold - Tomato juice is an example of this - These mixtures are heterogeneous, but do not settle - This statement summarizes a pattern of many observations iron and nickel are examples of this -Mechanical mixtures and suspensions share this property -In ancient Greece, these persons though about sustances in the world -This type of change produces new substances -Daltion suggested that atoms of different elsements combine this
Asked by Random Person - Wed Mar 25 05:16:58 2009 - - 1 Answers - 0 Comments
A. Those arent questions, more like clues. Rephrase?
Answered by rafaledeguerre - Wed Mar 25 05:32:03 2009
chemistry help with my input!?
Q. Alright, soo I'm having trouble in Chemistry, please help me. I put the answer I think it is in (parenthesis) so you know, I really did try, because I am trying hard in this class! Thank you for your help! Oh, and if you can explain please do, i really need to understand. 1: As a crystal of copper sulfate is heated, its weight___ increases decreases because crystals contain water and the water evaporates remains the same none of the above (decreases because crystals contian water and the water evaporates) 2: As additional salt is added to a dilute solution of salt, the boiling point of the solution ___ increases decreases because salt tends to lower the boiling point of a solution remains the same none of the above (increases) … [cont.]
Asked by Blair S - Fri Jan 23 10:32:27 2009 - - 3 Answers - 0 Comments
A. 1. Remains the same. Heating a compound does not change the amount of matter in it - therefore there is no change in weight. 2. Increases - this is simply a property of solutions. The more amount of solute one adds, the higher the boiling point elevation. 3. Decreases - liquid-gas solutions obey different rules than liquid-liquid solutions. An increase in temperature of a liquid-gas solution results in a decrease in solubility (the opposite is true for liquid-liquid). 4. Remains the same, assuming you have an ideal distillation (practically impossible, but for all intents are purpose you assume you do in theoretical examples). 5. Decreases - sodium carbonate effloresces to form lower hydrates. 6. Increase as per explanation. 7.… [cont.]
Answered by Azza - Fri Jan 23 10:47:36 2009
Q. Alright, soo I'm having trouble in Chemistry, please help me. I put the answer I think it is in (parenthesis) so you know, I really did try, because I am trying hard in this class! Thank you for your help! Oh, and if you can explain please do, i really need to understand. 1: As a crystal of copper sulfate is heated, its weight___ increases decreases because crystals contain water and the water evaporates remains the same none of the above (decreases because crystals contian water and the water evaporates) 2: As additional salt is added to a dilute solution of salt, the boiling point of the solution ___ increases decreases because salt tends to lower the boiling point of a solution remains the same none of the above (increases) … [cont.]
Asked by Blair S - Fri Jan 23 10:32:27 2009 - - 3 Answers - 0 Comments
A. 1. Remains the same. Heating a compound does not change the amount of matter in it - therefore there is no change in weight. 2. Increases - this is simply a property of solutions. The more amount of solute one adds, the higher the boiling point elevation. 3. Decreases - liquid-gas solutions obey different rules than liquid-liquid solutions. An increase in temperature of a liquid-gas solution results in a decrease in solubility (the opposite is true for liquid-liquid). 4. Remains the same, assuming you have an ideal distillation (practically impossible, but for all intents are purpose you assume you do in theoretical examples). 5. Decreases - sodium carbonate effloresces to form lower hydrates. 6. Increase as per explanation. 7.… [cont.]
Answered by Azza - Fri Jan 23 10:47:36 2009
Chemistry help.. Chem reactions in aqueous solutions?
Q. So there's precipitation, acid-base, gas forming, and redox.. Can anyone tell me how to tell the difference? Examples... Precipitation HCl (aq) + AgNO3 (aq) --> AgCl (s) + HNO3(aq) Acid-base HC2H3O2 (aq) + KOH (aq)--> KC2H3O2 (aq) + H2O (l) Gas-forming 2HCl (aq) + Na2S (aq) --> 2NaCl (aq) + H2S (g) Oxidation-reduction: Fe (s) + Ni(NO3)2(aq) --> Fe(NO3)2(aq) + Ni (s) How do I know which elements will change into a solid, liquid, gas or aqueous solution?? Is there a list anywhere? Thanks.
Asked by Azure - Fri Oct 23 22:35:29 2009 - - 1 Answers - 0 Comments
A. you just have to know the solubility rules but you can find a table by googling solublity tables
Answered by mintyfresh - Fri Oct 23 22:40:28 2009
Q. So there's precipitation, acid-base, gas forming, and redox.. Can anyone tell me how to tell the difference? Examples... Precipitation HCl (aq) + AgNO3 (aq) --> AgCl (s) + HNO3(aq) Acid-base HC2H3O2 (aq) + KOH (aq)--> KC2H3O2 (aq) + H2O (l) Gas-forming 2HCl (aq) + Na2S (aq) --> 2NaCl (aq) + H2S (g) Oxidation-reduction: Fe (s) + Ni(NO3)2(aq) --> Fe(NO3)2(aq) + Ni (s) How do I know which elements will change into a solid, liquid, gas or aqueous solution?? Is there a list anywhere? Thanks.
Asked by Azure - Fri Oct 23 22:35:29 2009 - - 1 Answers - 0 Comments
A. you just have to know the solubility rules but you can find a table by googling solublity tables
Answered by mintyfresh - Fri Oct 23 22:40:28 2009
Can you explain this in layman's terms?
Q. A dye-sublimation printer (or dye-sub printer) is a computer printer which employs a printing process that uses heat to transfer dye to a medium such as a plastic card, printer paper or poster paper. The process is usually to lay one color at a time using a ribbon that has color panels. Most dye-sublimation printers use CMYO colors which differs from the more recognised CMYK colors in that the black dye is eliminated in favour of a clear overcoating. This overcoating (which has numerous names depending on the manufacturer) is effectively a thin laminate which protects the print from discoloration from UV light and the air while also rendering the print water-resistant. Many consumer and professional dye-sublimation printers are designed… [cont.]
Asked by Lynn - Fri Nov 2 12:54:09 2007 - - 1 Answers - 0 Comments
A. 'Sublimation' is a term from chemistry. You know how if you heat up ice it turns to water, a liquid, and then to a gas. Sublimation is when a solid turns directly into a gas. Like dry ice when it melts. So a 'dye sublimation' printer is one where instead of a liquid ink you have a solid 'dye' which turns to a gas to transfer to the paper. There's a tiny electric heating element behind each color. The heating element heats up just for an instant and 'sublimates' a little dye which is transferred to the paper where it hardens again. This is similar to an ink-jet printer where it is -liquid- ink that boils off and transfers to the paper. Your typical inkjet printer has four colors, Cyan, Magenta, Yellow and Black. Cyan is halfway… [cont.]
Answered by Mr. Knowitall - Fri Nov 2 13:07:06 2007
Q. A dye-sublimation printer (or dye-sub printer) is a computer printer which employs a printing process that uses heat to transfer dye to a medium such as a plastic card, printer paper or poster paper. The process is usually to lay one color at a time using a ribbon that has color panels. Most dye-sublimation printers use CMYO colors which differs from the more recognised CMYK colors in that the black dye is eliminated in favour of a clear overcoating. This overcoating (which has numerous names depending on the manufacturer) is effectively a thin laminate which protects the print from discoloration from UV light and the air while also rendering the print water-resistant. Many consumer and professional dye-sublimation printers are designed… [cont.]
Asked by Lynn - Fri Nov 2 12:54:09 2007 - - 1 Answers - 0 Comments
A. 'Sublimation' is a term from chemistry. You know how if you heat up ice it turns to water, a liquid, and then to a gas. Sublimation is when a solid turns directly into a gas. Like dry ice when it melts. So a 'dye sublimation' printer is one where instead of a liquid ink you have a solid 'dye' which turns to a gas to transfer to the paper. There's a tiny electric heating element behind each color. The heating element heats up just for an instant and 'sublimates' a little dye which is transferred to the paper where it hardens again. This is similar to an ink-jet printer where it is -liquid- ink that boils off and transfers to the paper. Your typical inkjet printer has four colors, Cyan, Magenta, Yellow and Black. Cyan is halfway… [cont.]
Answered by Mr. Knowitall - Fri Nov 2 13:07:06 2007
How many pages is this in microsoft word?
Q. In science there is a lot of changes in matter, There are two types, Physical and Chemical Matter is anything that has mass and volume. To understand changes in matter, you need to know what the sample of matter was like before the change and what it is like after the change. You also need to be able to describe and classify matter. States of Matter: Solid Liquid Gas Any kind of matter can be classified as a mixture or a pure substance. Mixture--matter that has two or more kinds of particles and thus may have different properties in different samples Pure substance--a substance that has the same properties in any sample you choose. There are two kinds of pure substances: elements and compounds. A physical change in a… [cont.]
Asked by Leandra.AKA.Lala ! - Wed Apr 30 19:44:53 2008 - - 3 Answers - 0 Comments
A. It is 5 pages long
Answered by Phantom Unknown - Wed Apr 30 19:52:27 2008
Q. In science there is a lot of changes in matter, There are two types, Physical and Chemical Matter is anything that has mass and volume. To understand changes in matter, you need to know what the sample of matter was like before the change and what it is like after the change. You also need to be able to describe and classify matter. States of Matter: Solid Liquid Gas Any kind of matter can be classified as a mixture or a pure substance. Mixture--matter that has two or more kinds of particles and thus may have different properties in different samples Pure substance--a substance that has the same properties in any sample you choose. There are two kinds of pure substances: elements and compounds. A physical change in a… [cont.]
Asked by Leandra.AKA.Lala ! - Wed Apr 30 19:44:53 2008 - - 3 Answers - 0 Comments
A. It is 5 pages long
Answered by Phantom Unknown - Wed Apr 30 19:52:27 2008
Is it good to drink milk? The text is too long but worthwhile read....?
Q. es esta pagina link The most important information dissemination my. Not that, but I can make your text too long jajaja. If I write bad is that I am leading a translator jaja
Asked by chica - Mon Nov 19 11:02:22 2007 - - 10 Answers - 14 Comments
A. wow. Looks like you had allot of thought to this. My thoughts to this. People have been drinking milk for positively centuries and millenia. If you like it, drink it. If you don't, don't.
Answered by Terri - Mon Nov 19 11:12:18 2007
Q. es esta pagina link The most important information dissemination my. Not that, but I can make your text too long jajaja. If I write bad is that I am leading a translator jaja
Asked by chica - Mon Nov 19 11:02:22 2007 - - 10 Answers - 14 Comments
A. wow. Looks like you had allot of thought to this. My thoughts to this. People have been drinking milk for positively centuries and millenia. If you like it, drink it. If you don't, don't.
Answered by Terri - Mon Nov 19 11:12:18 2007
ipc questions [10pts]?
Q. 5.the chemical symbol for sulfuric acid is H2SO4 .How many atoms are contained in each molecule of sulfuric acid? 6.The chemical formula for table sugar is c12H22o11.How many oxygen atoms are in each sugar molecule? 7.which of the following is an example of gas-liquid mixture? 8.You put 1 gram of salt into 1 liter of water and stir .The resulting liquid is an example of 9.which state of matter will hold its shape without a container? 10.the resistance of a fluid to flow is referred to as 11.the kinetic theory states that the higher the temperature ,the faster the 12.the kinetic theory is useful for 13.the abiliy to change or to move matter is referred to as 14.the change of a substance from a solid directly to a gas is… [cont.]
Asked by emokolorz - Tue Feb 26 22:55:51 2008 - - 2 Answers - 0 Comments
A. Why don't you post what you think the answers are ... and we'll correct your work! Otherwise it just looks like you want us to do your homework for you .. and not HELP (this is Homework HELP you know).
Answered by Feisty - Wed Feb 27 17:27:35 2008
Q. 5.the chemical symbol for sulfuric acid is H2SO4 .How many atoms are contained in each molecule of sulfuric acid? 6.The chemical formula for table sugar is c12H22o11.How many oxygen atoms are in each sugar molecule? 7.which of the following is an example of gas-liquid mixture? 8.You put 1 gram of salt into 1 liter of water and stir .The resulting liquid is an example of 9.which state of matter will hold its shape without a container? 10.the resistance of a fluid to flow is referred to as 11.the kinetic theory states that the higher the temperature ,the faster the 12.the kinetic theory is useful for 13.the abiliy to change or to move matter is referred to as 14.the change of a substance from a solid directly to a gas is… [cont.]
Asked by emokolorz - Tue Feb 26 22:55:51 2008 - - 2 Answers - 0 Comments
A. Why don't you post what you think the answers are ... and we'll correct your work! Otherwise it just looks like you want us to do your homework for you .. and not HELP (this is Homework HELP you know).
Answered by Feisty - Wed Feb 27 17:27:35 2008
How many global warmings have occurred in the past?
Q. Unlike most apparently intractable problems, which have a tendency to go away when examined closely and analytically, the climate change predicament just seems to get bigger and scarier the more we learn about it. Now we discover that not only are the oceans and the atmosphere conspiring against us, bringing baking temperatures, more powerful storms, floods and ever-climbing sea levels, but the crust beneath our feet seems likely to join in too. Looking back to other periods in our planet's history when the climate was swinging about wildly, most notably during the last ice age, it appears that far more than the weather was affected. The solid earth also became restless, with an increase in volcanic activity, earthquakes, giant… [cont.]
Asked by GREAT_AMERICAN - Wed Aug 8 16:36:02 2007 - - 11 Answers - 0 Comments
A. There have been countless warmings and coolings of the planet during it's existence.
Answered by Brian - Wed Aug 8 16:39:58 2007
Q. Unlike most apparently intractable problems, which have a tendency to go away when examined closely and analytically, the climate change predicament just seems to get bigger and scarier the more we learn about it. Now we discover that not only are the oceans and the atmosphere conspiring against us, bringing baking temperatures, more powerful storms, floods and ever-climbing sea levels, but the crust beneath our feet seems likely to join in too. Looking back to other periods in our planet's history when the climate was swinging about wildly, most notably during the last ice age, it appears that far more than the weather was affected. The solid earth also became restless, with an increase in volcanic activity, earthquakes, giant… [cont.]
Asked by GREAT_AMERICAN - Wed Aug 8 16:36:02 2007 - - 11 Answers - 0 Comments
A. There have been countless warmings and coolings of the planet during it's existence.
Answered by Brian - Wed Aug 8 16:39:58 2007
methods of purification-chem question?
Q. hello friends, here are some chemistry questions plz help me in answering them. 1. Why sand cannot dissolve in water? explain me everything and in easy words ;] 2. why is it that the slower the evaporation, the bigger the crystals? 3.what is meant by ''water of crystilization''? and is it like when for example water evaporates and leaves behind salt crystals, there is still some water in salt crystals? 4.why is decanting not an effective way of purification? tell me how particles work n evrything plz explain by step by step 5. separating funnel is one of the method to separet two immiscible liquids and the ''separation is never entorely completed'' . what is meant by that phrase adn why is it like that? 6.sublimation is one of the… [cont.]
Asked by anne - Thu Nov 5 03:53:15 2009 - - 1 Answers - 0 Comments
A. 1. Sand is a covalently bonded substance which will not dissolve in water unlike salt which is ionic. 2. Evaporation is not 100% effective, and the faster you go the more of the crystallising substance will be stuck with the water when it evaporates. 3. ? 4. Water's surface tension will pull in some particles that are too big to sink. 5. ? 6. ?
Answered by unknown - Thu Nov 5 04:31:56 2009
Q. hello friends, here are some chemistry questions plz help me in answering them. 1. Why sand cannot dissolve in water? explain me everything and in easy words ;] 2. why is it that the slower the evaporation, the bigger the crystals? 3.what is meant by ''water of crystilization''? and is it like when for example water evaporates and leaves behind salt crystals, there is still some water in salt crystals? 4.why is decanting not an effective way of purification? tell me how particles work n evrything plz explain by step by step 5. separating funnel is one of the method to separet two immiscible liquids and the ''separation is never entorely completed'' . what is meant by that phrase adn why is it like that? 6.sublimation is one of the… [cont.]
Asked by anne - Thu Nov 5 03:53:15 2009 - - 1 Answers - 0 Comments
A. 1. Sand is a covalently bonded substance which will not dissolve in water unlike salt which is ionic. 2. Evaporation is not 100% effective, and the faster you go the more of the crystallising substance will be stuck with the water when it evaporates. 3. ? 4. Water's surface tension will pull in some particles that are too big to sink. 5. ? 6. ?
Answered by unknown - Thu Nov 5 04:31:56 2009
Can u help me with these science questions??
Q. 1. The substance being dissolved to form a solution is the ___. (1 point) solvent solute precipitate mixture 2. The atmosphere of Earth is an example of a ___ solution. (1 point) liquid-liquid gas-liquid gas-gas solid-liquid 3. Which of the following will cause a greater amount of oxygen to dissolve in 100 g of water? (1 point) Heat the water. Decrease the oxygen gas pressure. Increase the oxygen gas pressure. all of the above 4. Which of the following mixtures is NOT an example of a substance? (1 point) drinking water air brass pizza 5. The amount of table sugar that will dissolve in 1 kg of water can be increased by ___. (1 point) stirring the solution heating the solution breaking the sugar into smaller pieces doing any… [cont.]
Asked by Molly's Dark Halo - Wed Apr 29 15:10:33 2009 - - 1 Answers - 0 Comments
A. Is this your homework or something, I think you should do it yourself. Sorry.
Answered by unknown - Wed Apr 29 15:22:57 2009
Q. 1. The substance being dissolved to form a solution is the ___. (1 point) solvent solute precipitate mixture 2. The atmosphere of Earth is an example of a ___ solution. (1 point) liquid-liquid gas-liquid gas-gas solid-liquid 3. Which of the following will cause a greater amount of oxygen to dissolve in 100 g of water? (1 point) Heat the water. Decrease the oxygen gas pressure. Increase the oxygen gas pressure. all of the above 4. Which of the following mixtures is NOT an example of a substance? (1 point) drinking water air brass pizza 5. The amount of table sugar that will dissolve in 1 kg of water can be increased by ___. (1 point) stirring the solution heating the solution breaking the sugar into smaller pieces doing any… [cont.]
Asked by Molly's Dark Halo - Wed Apr 29 15:10:33 2009 - - 1 Answers - 0 Comments
A. Is this your homework or something, I think you should do it yourself. Sorry.
Answered by unknown - Wed Apr 29 15:22:57 2009
Could you proofread this?
Q. One of my greatest strengths as a teacher is my ability to differentiate lessons to meet the needs of every child. I take the time to get to know each of my students as individuals and find out what is important and interesting to them. I use different types of formative and summative assessments to monitor the strengths of my students, and I am able to maintain meaningful records of my students work and performance. I refer to my records while designing lesson plans and coming up with activities. Because every child learns differently, it is important to adapt teaching methods and strategies to meet the needs of every child. Another one of my strengths as a teacher is my ability to develop creative and engaging lessons. I very… [cont.]
Asked by Jewelee - Tue May 5 11:03:23 2009 - - 11 Answers - 0 Comments
A. Needs some slight refinement. No grammar errors. No spelling errors. Thesis is supported throughout. I recommend a thesaurus (they always make for some more interesting sentences). Wouldn't hurt to talk about why your method is more effective. Think about your experiences as a student and teachers that you had. What do you do differently that makes your method better? How does the method improve what the children learn as compared to said teacher? And so on.
Answered by unknown - Tue May 5 11:16:08 2009
Q. One of my greatest strengths as a teacher is my ability to differentiate lessons to meet the needs of every child. I take the time to get to know each of my students as individuals and find out what is important and interesting to them. I use different types of formative and summative assessments to monitor the strengths of my students, and I am able to maintain meaningful records of my students work and performance. I refer to my records while designing lesson plans and coming up with activities. Because every child learns differently, it is important to adapt teaching methods and strategies to meet the needs of every child. Another one of my strengths as a teacher is my ability to develop creative and engaging lessons. I very… [cont.]
Asked by Jewelee - Tue May 5 11:03:23 2009 - - 11 Answers - 0 Comments
A. Needs some slight refinement. No grammar errors. No spelling errors. Thesis is supported throughout. I recommend a thesaurus (they always make for some more interesting sentences). Wouldn't hurt to talk about why your method is more effective. Think about your experiences as a student and teachers that you had. What do you do differently that makes your method better? How does the method improve what the children learn as compared to said teacher? And so on.
Answered by unknown - Tue May 5 11:16:08 2009
Need help mastering these chemistry question. Need help to see if these are right!! Thanks?
Q. Write a balanced equation for each of the following reactions Then classify each as: synthesis (S), decomposition (D), combustion (C), single displacement (SD), or double displacement (DD) example zinc metal reacts with aqueous silver nitrate to produce solid silver and an aqueous solution of zinc nitrate Balanced Equation: Zn(s) +2AgNO3(aq) 2Ag(s) +Zn(NO3)2(aq) SD I dont really know where to put the (s),(d),(c),(SD),or(DD) in the chem rxn D? 1. Solid iron(III)hydroxide breaks into solid iron(III) oxide and water vapor when heated Balanced equation:?? 2Fe(Oh)3 Fe2O3+3H20 __?__2. Ammonia gas (NH3) plus sulfuric acid yields aqueous ammonium sulfate. Balanced equation:?? 2NH3 + H2SO4 (NH4)2SO4 SD? 3. Magnesium and nitric acid… [cont.]
Asked by A b e r z o m b i ee - Wed Nov 28 22:45:32 2007 - - 2 Answers - 0 Comments
A. Although the equations written are correct, as far the example given by you and the wording in the questions are concerned, the states of the substances are missing. There is also one mistake in the type of the reaction. You also require some information about determining the type of reactions. (S) Synthesis reactions are also known as combination reactions. The general formula of these types of reactions can be stated as; X + Y ---> XY Your second reaction is this type of reaction: 2NH3(g) + H2SO4(aq) (NH4)2SO4(aq) By evaporating the solution after completion of the reaction you obtain solid ammonium sulfate. (D) Decomposion reactions are the reverse of the synthesis reactions. The general formula of these types of reactions can be… [cont.]
Answered by Guray T - Thu Nov 29 11:47:36 2007
Q. Write a balanced equation for each of the following reactions Then classify each as: synthesis (S), decomposition (D), combustion (C), single displacement (SD), or double displacement (DD) example zinc metal reacts with aqueous silver nitrate to produce solid silver and an aqueous solution of zinc nitrate Balanced Equation: Zn(s) +2AgNO3(aq) 2Ag(s) +Zn(NO3)2(aq) SD I dont really know where to put the (s),(d),(c),(SD),or(DD) in the chem rxn D? 1. Solid iron(III)hydroxide breaks into solid iron(III) oxide and water vapor when heated Balanced equation:?? 2Fe(Oh)3 Fe2O3+3H20 __?__2. Ammonia gas (NH3) plus sulfuric acid yields aqueous ammonium sulfate. Balanced equation:?? 2NH3 + H2SO4 (NH4)2SO4 SD? 3. Magnesium and nitric acid… [cont.]
Asked by A b e r z o m b i ee - Wed Nov 28 22:45:32 2007 - - 2 Answers - 0 Comments
A. Although the equations written are correct, as far the example given by you and the wording in the questions are concerned, the states of the substances are missing. There is also one mistake in the type of the reaction. You also require some information about determining the type of reactions. (S) Synthesis reactions are also known as combination reactions. The general formula of these types of reactions can be stated as; X + Y ---> XY Your second reaction is this type of reaction: 2NH3(g) + H2SO4(aq) (NH4)2SO4(aq) By evaporating the solution after completion of the reaction you obtain solid ammonium sulfate. (D) Decomposion reactions are the reverse of the synthesis reactions. The general formula of these types of reactions can be… [cont.]
Answered by Guray T - Thu Nov 29 11:47:36 2007
Basic chemistry question about molecules?
Q. I just started general chemistry in high school and I have a few questions to ask. They are not hard so I am sure someone will be able to answer them. 1) What is the difference between a molecule and a compound? Be detailed please and give an example. 2)Does a molecule have to be made of the same atoms? For example, a molecule of 5 oxygen atoms is "a molecule" . But what about 3 atoms of hydrogen fused w/ 7 atoms of helium. Would that still be considered a molecule? Explain fully please. I am really trying to understand this basic information well. 3)What is the difference between a "mixture" and a "pure substance" ? 4)Explain the law of constant composition (also called law of definite proportions) 5)My book talks about 3 states of… [cont.]
Asked by Rosario N - Sun Jul 12 12:47:16 2009 - - 1 Answers - 0 Comments
A. A compound is a group of molecules. No, any group of atoms chemically bonded is a molecule. Regardless of what atoms are in it. edit to be clearer on 2. With mixtures think trail mix. Each type of thing in it a different molecule. Pure substance is a compound with only one type of molecule in it Plasma is an ionized gas. its when the electrons get so much energy they break off from their nucleus's and form a cloud of free moving electrons and nucleuses. edit: Plasma is quite complicated and we still don't know everything about it, therefore it could be deemed to confusing for a first chemistry course.
Answered by Sarteka - Sun Jul 12 12:53:23 2009
Q. I just started general chemistry in high school and I have a few questions to ask. They are not hard so I am sure someone will be able to answer them. 1) What is the difference between a molecule and a compound? Be detailed please and give an example. 2)Does a molecule have to be made of the same atoms? For example, a molecule of 5 oxygen atoms is "a molecule" . But what about 3 atoms of hydrogen fused w/ 7 atoms of helium. Would that still be considered a molecule? Explain fully please. I am really trying to understand this basic information well. 3)What is the difference between a "mixture" and a "pure substance" ? 4)Explain the law of constant composition (also called law of definite proportions) 5)My book talks about 3 states of… [cont.]
Asked by Rosario N - Sun Jul 12 12:47:16 2009 - - 1 Answers - 0 Comments
A. A compound is a group of molecules. No, any group of atoms chemically bonded is a molecule. Regardless of what atoms are in it. edit to be clearer on 2. With mixtures think trail mix. Each type of thing in it a different molecule. Pure substance is a compound with only one type of molecule in it Plasma is an ionized gas. its when the electrons get so much energy they break off from their nucleus's and form a cloud of free moving electrons and nucleuses. edit: Plasma is quite complicated and we still don't know everything about it, therefore it could be deemed to confusing for a first chemistry course.
Answered by Sarteka - Sun Jul 12 12:53:23 2009
From Yahoo Answer Search: 'give an examples of solid into gas'
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Emre Baloglu
Sun, 01 Nov 2009 04:47:29 GM
If a . gas. is quickly compressed, then it's temperature is increased. Work has been done by compressing the . gas. , which has been converted . into. internal energy. If the . gas. is then allowed to cool, heat equal to the amount of energy supplied by the . ... and thus entropy is increasing the movement from . solid. \rightarrow liquid \rightarrow . gas. also marks an increase in entropy, as particles are moving more and more randomly. If anyone has any interesting . examples. send them to ...
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