What is the energy of combustion per unit mass of the unknown substance?
Q. The complete combustion of salicylic acid releases 21.90 kJ of energy per gram of salicylic acid. In a particular bomb calorimeter (initially at room temperature), the combustion of 0.1424 g of salicylic acid, in the presence of excess oxygen, causes the temperature of the calorimeter to rise by 1.72 C. When a 0.3576-g sample of an unknown organic substance is similarly burned in the same calorimeter, the temperature rises by 3.88 C. What is the energy of combustion per unit mass of the unknown substance?
Asked by jack p - Fri Feb 13 13:58:07 2009 - - 1 Answers - 0 Comments
A. It's straight math: E(SA) ~ 1.72/0.1424 ("~" meaning "is proportional to") E(unknown) ~ 3.88/0.3576 E(unknown) = E(SA) * 3.88/1.72 * 0.1424/0.3576
Answered by kirchwey - Fri Feb 13 14:56:31 2009
Q. The complete combustion of salicylic acid releases 21.90 kJ of energy per gram of salicylic acid. In a particular bomb calorimeter (initially at room temperature), the combustion of 0.1424 g of salicylic acid, in the presence of excess oxygen, causes the temperature of the calorimeter to rise by 1.72 C. When a 0.3576-g sample of an unknown organic substance is similarly burned in the same calorimeter, the temperature rises by 3.88 C. What is the energy of combustion per unit mass of the unknown substance?
Asked by jack p - Fri Feb 13 13:58:07 2009 - - 1 Answers - 0 Comments
A. It's straight math: E(SA) ~ 1.72/0.1424 ("~" meaning "is proportional to") E(unknown) ~ 3.88/0.3576 E(unknown) = E(SA) * 3.88/1.72 * 0.1424/0.3576
Answered by kirchwey - Fri Feb 13 14:56:31 2009
What has a mass of one atomic mass unit, but neutral in charge?
Q. What has a mass of one atomic mass unit, but neutral in charge?
Asked by Jejeje J - Thu Feb 14 22:13:29 2008 - - 1 Answers - 0 Comments
A. neutron
Answered by grimmyTea - Thu Feb 14 22:23:11 2008
Q. What has a mass of one atomic mass unit, but neutral in charge?
Asked by Jejeje J - Thu Feb 14 22:13:29 2008 - - 1 Answers - 0 Comments
A. neutron
Answered by grimmyTea - Thu Feb 14 22:23:11 2008
What is the smallest unit of mass and energy?
Q. Since they have the smallest units of length and time, do they also know the smallest unit of mass/energy?
Asked by Mr. LOL - Wed Mar 4 13:57:19 2009 - - 2 Answers - 0 Comments
A. I was unable to find anything definitive but the list of prefixes below suggest that a yocto gram or joule would be a practical limit to either mass or energy. You might wish to examine the link at the bottom of the page the link below directs you to.
Answered by Stephen Y - Wed Mar 4 14:25:00 2009
Q. Since they have the smallest units of length and time, do they also know the smallest unit of mass/energy?
Asked by Mr. LOL - Wed Mar 4 13:57:19 2009 - - 2 Answers - 0 Comments
A. I was unable to find anything definitive but the list of prefixes below suggest that a yocto gram or joule would be a practical limit to either mass or energy. You might wish to examine the link at the bottom of the page the link below directs you to.
Answered by Stephen Y - Wed Mar 4 14:25:00 2009
the carat is the unit of mass used by jewelries. 1carat is exactly 200mg. How many C atoms in a 24carat diamon
Q. the carat is the unit of mass used by jewelries. i crat is exactly 200mg. how many C atoms are present in a 24carat diamond?
Asked by cathychem - Wed Jun 25 11:06:17 2008 - - 3 Answers - 0 Comments
A. this is a simple unit analysis problem: 24carats x 200mg/carat x 1g/1000mg x 1moleC/12gC x 6.022x10^23atoms/mole = 2.4x10^23atoms
Answered by B-Mar - Wed Jun 25 11:31:44 2008
Q. the carat is the unit of mass used by jewelries. i crat is exactly 200mg. how many C atoms are present in a 24carat diamond?
Asked by cathychem - Wed Jun 25 11:06:17 2008 - - 3 Answers - 0 Comments
A. this is a simple unit analysis problem: 24carats x 200mg/carat x 1g/1000mg x 1moleC/12gC x 6.022x10^23atoms/mole = 2.4x10^23atoms
Answered by B-Mar - Wed Jun 25 11:31:44 2008
Is the Pound a unit of mass or force in the US?
Q. The pound is an old imperial measure, mass-wise it it 454g or 0.454 kg. It is also used as a measure of force in pressure such as PSI and in torque such as pound-feet. But it cannot be both a unit of Mass and a unit of force. In the UK we all use SI and tend to think of pounds as a unit of force. What is the case in the US? If the pound is a unit of force what do you use for Mass? Surely you can't use the pound for both? Do you?
Asked by Michael G - Tue Feb 26 05:16:12 2008 - - 8 Answers - 0 Comments
A. In the US, the formal unit for mass is slug. It is rarely used. The formal unit for force is pound. It is noted as lb or if there is confusion lb (f), with (f) denoting a subscript "f." It is very common in the US to use a contrived unit for mass known as the pound -mass. This has units of lb (m). One lb (m) when accelerated by gravity gives rise to one lb (f). When a person is weighed on a scale, the reading is in pounds. The scale reads a force, lb (f). The mass of the person is the mass-equivalent ,lb (m).
Answered by titaniumsandwedge - Tue Feb 26 05:48:56 2008
Q. The pound is an old imperial measure, mass-wise it it 454g or 0.454 kg. It is also used as a measure of force in pressure such as PSI and in torque such as pound-feet. But it cannot be both a unit of Mass and a unit of force. In the UK we all use SI and tend to think of pounds as a unit of force. What is the case in the US? If the pound is a unit of force what do you use for Mass? Surely you can't use the pound for both? Do you?
Asked by Michael G - Tue Feb 26 05:16:12 2008 - - 8 Answers - 0 Comments
A. In the US, the formal unit for mass is slug. It is rarely used. The formal unit for force is pound. It is noted as lb or if there is confusion lb (f), with (f) denoting a subscript "f." It is very common in the US to use a contrived unit for mass known as the pound -mass. This has units of lb (m). One lb (m) when accelerated by gravity gives rise to one lb (f). When a person is weighed on a scale, the reading is in pounds. The scale reads a force, lb (f). The mass of the person is the mass-equivalent ,lb (m).
Answered by titaniumsandwedge - Tue Feb 26 05:48:56 2008
Which two particles each have a mass approximately equal to one Atomic mass unit?
Q. Which two particles each have a mass approximately equal to one Atomic mass unit? 1.) electron and neutron 2.)electron and positron 3.)Proton and electron 4.)proton and neutron What is a positron? I have never heard of that until now...
Asked by Audri - Mon May 4 12:37:48 2009 - - 7 Answers - 0 Comments
A. Answer is 4, proton and neutron. Electrons have much smaller mass approximately 1/1835 atomic mass units (amu) A positron is a theoretical particle that is suppose to be about the size of an electron but would have a positive charge just like a proton. You will not seriously study positrons in an ordinary high school or lower level college chemistry or physics class, they are the in the realm of theoretical physics.
Answered by Upward Bound Precalc Tutor - Mon May 4 12:45:52 2009
Q. Which two particles each have a mass approximately equal to one Atomic mass unit? 1.) electron and neutron 2.)electron and positron 3.)Proton and electron 4.)proton and neutron What is a positron? I have never heard of that until now...
Asked by Audri - Mon May 4 12:37:48 2009 - - 7 Answers - 0 Comments
A. Answer is 4, proton and neutron. Electrons have much smaller mass approximately 1/1835 atomic mass units (amu) A positron is a theoretical particle that is suppose to be about the size of an electron but would have a positive charge just like a proton. You will not seriously study positrons in an ordinary high school or lower level college chemistry or physics class, they are the in the realm of theoretical physics.
Answered by Upward Bound Precalc Tutor - Mon May 4 12:45:52 2009
I need a twelve letter word for the quantity of heat required to raise a unit mass of material 1K or 1C?
Q. I need a twelve letter word for the quantity of heat required to raise a unit mass of material 1K or 1C
Asked by The Answerer - Wed Feb 7 23:41:21 2007 - - 4 Answers - 0 Comments
A. specific heat
Answered by calpain20002000 - Wed Feb 7 23:44:32 2007
Q. I need a twelve letter word for the quantity of heat required to raise a unit mass of material 1K or 1C
Asked by The Answerer - Wed Feb 7 23:41:21 2007 - - 4 Answers - 0 Comments
A. specific heat
Answered by calpain20002000 - Wed Feb 7 23:44:32 2007
The atomic mass unit is presently based on assigning an exact integral mass (in amu) to an isotope of?
Q. The options are Hydrogen, Oxygen, Sodium, Carbon, and Helium and the Answer is Carbon i just want to know why? Please help.
Asked by Ana - Sat Sep 15 13:00:20 2007 - - 1 Answers - 0 Comments
A. Carbon 12. There really is no rhyme or reason why. Scientists just need some arbitrary point for the definition so other masses can be related to the standard. It's the same for the standard kilogram. A block was chosen to be assigned a mass of exactly one kilogram and the masses of other objects can be quantified based on the definition. But one reason why scientists chose carbon might be because it is the most versatile element, capable of forming millions, if not billions of unique compounds.
Answered by Science Geek - Sat Sep 15 13:13:41 2007
Q. The options are Hydrogen, Oxygen, Sodium, Carbon, and Helium and the Answer is Carbon i just want to know why? Please help.
Asked by Ana - Sat Sep 15 13:00:20 2007 - - 1 Answers - 0 Comments
A. Carbon 12. There really is no rhyme or reason why. Scientists just need some arbitrary point for the definition so other masses can be related to the standard. It's the same for the standard kilogram. A block was chosen to be assigned a mass of exactly one kilogram and the masses of other objects can be quantified based on the definition. But one reason why scientists chose carbon might be because it is the most versatile element, capable of forming millions, if not billions of unique compounds.
Answered by Science Geek - Sat Sep 15 13:13:41 2007
What is the element whose common isotopic form is the basis of the atomic mass unit?
Q. What is the element whose common isotopic form is the basis of the atomic mass unit?
Asked by Krista J - Thu Jan 10 20:34:30 2008 - - 4 Answers - 0 Comments
A. C-12
Answered by skipper - Thu Jan 10 20:40:15 2008
Q. What is the element whose common isotopic form is the basis of the atomic mass unit?
Asked by Krista J - Thu Jan 10 20:34:30 2008 - - 4 Answers - 0 Comments
A. C-12
Answered by skipper - Thu Jan 10 20:40:15 2008
Do we usually assign a unit to the formula mass of a compound?
Q. I'm really not getting it. One chemistry teacher say the Relative Atomic Masses do not have units, another chemistry teacher says they do and the unit is gram per mole.
Asked by Ruby - Sun Jun 21 04:44:51 2009 - - 2 Answers - 0 Comments
A. there is nothing to be confused about it. Mass is expressed in grams as the mass of one atom is very small it is normally express ed as compared to carbon atom taken as 12. So when you express it as a number it implies the relative atomic mass as compared to carbon as slandered taken at 12. And other method is to express it in gram mole it refers to the mass of avogadro number of molecules for different substances,and it is expressed in grams for Oxygen 32 and nitrogen 28 and so on.if the gas is mono atomic like neon or helium it will be equal to atomic mass and for diatomic it will be molecular mass. so these are two different methods both are correct.
Answered by DPG - Sun Jun 21 05:01:13 2009
Q. I'm really not getting it. One chemistry teacher say the Relative Atomic Masses do not have units, another chemistry teacher says they do and the unit is gram per mole.
Asked by Ruby - Sun Jun 21 04:44:51 2009 - - 2 Answers - 0 Comments
A. there is nothing to be confused about it. Mass is expressed in grams as the mass of one atom is very small it is normally express ed as compared to carbon atom taken as 12. So when you express it as a number it implies the relative atomic mass as compared to carbon as slandered taken at 12. And other method is to express it in gram mole it refers to the mass of avogadro number of molecules for different substances,and it is expressed in grams for Oxygen 32 and nitrogen 28 and so on.if the gas is mono atomic like neon or helium it will be equal to atomic mass and for diatomic it will be molecular mass. so these are two different methods both are correct.
Answered by DPG - Sun Jun 21 05:01:13 2009
What is the force on a unit mass due to gravity called?
Q. What is the force on a unit mass due to gravity called?
Asked by Paula - Sun Sep 9 02:51:51 2007 - - 4 Answers - 0 Comments
A. Gravitational Force
Answered by Gnome Friend - Sun Sep 9 02:59:59 2007
Q. What is the force on a unit mass due to gravity called?
Asked by Paula - Sun Sep 9 02:51:51 2007 - - 4 Answers - 0 Comments
A. Gravitational Force
Answered by Gnome Friend - Sun Sep 9 02:59:59 2007
Which of the following would be expected to expend the greatest amount of energy for locomotion per unit mass?
Q. 1.a whale 2.a bony fish 3.a terrestrial reptile 4.a robin 5.a tadpole
Asked by jD - Mon Apr 20 02:28:53 2009 - - 1 Answers - 2 Comments
A. I guess it's the tadpole. Since it is still in its young stage, the tadpole's body uses much energy to build itself into an adult frog and a locomotion adds more to the energy demand.
Answered by Play RebirthRO - Mon Apr 20 06:03:02 2009
Q. 1.a whale 2.a bony fish 3.a terrestrial reptile 4.a robin 5.a tadpole
Asked by jD - Mon Apr 20 02:28:53 2009 - - 1 Answers - 2 Comments
A. I guess it's the tadpole. Since it is still in its young stage, the tadpole's body uses much energy to build itself into an adult frog and a locomotion adds more to the energy demand.
Answered by Play RebirthRO - Mon Apr 20 06:03:02 2009
What is the standard for the atomic mass unit?
Q. What is the standard for the atomic mass unit?
Asked by B.Hulin - Wed Oct 22 06:59:22 2008 - - 1 Answers - 0 Comments
A. Atomic mass unit is compared to carbon 12. As it is the most stable isotope.
Answered by -road - Wed Oct 22 07:05:23 2008
Q. What is the standard for the atomic mass unit?
Asked by B.Hulin - Wed Oct 22 06:59:22 2008 - - 1 Answers - 0 Comments
A. Atomic mass unit is compared to carbon 12. As it is the most stable isotope.
Answered by -road - Wed Oct 22 07:05:23 2008
Why is it more convinient to use the Unified Mass Unit (u) to express the mass of an atom?
Q. 1u= 1.660559x10^-27 kg..why is it more convinient to use it in atoms?
Asked by Emilster - Sun Jan 18 05:31:28 2009 - - 2 Answers - 0 Comments
A. Because when you're dealing with the mass of a an atom, like, say, the mass of helium, it would be easier to say that it has a mass of roughly 4u than to say that it has a mass of 6.64x10^-27kg. Also, when you convert the mass of an atom to the Unified Mass Unit, you can easily just use that value as its molar mass. For example, the Atomic Mass Unit (Unified Mass Unit) is 4u, right? Well there are 4g of helium per mole. That's just the way that Avogadro's number (6.0223x10^23 atoms per mole) was worked out . He made it so that the molecular mass (Unified Mass Unit) of each element would be its molar mass.
Answered by DarkSun - Sun Jan 18 06:42:28 2009
Q. 1u= 1.660559x10^-27 kg..why is it more convinient to use it in atoms?
Asked by Emilster - Sun Jan 18 05:31:28 2009 - - 2 Answers - 0 Comments
A. Because when you're dealing with the mass of a an atom, like, say, the mass of helium, it would be easier to say that it has a mass of roughly 4u than to say that it has a mass of 6.64x10^-27kg. Also, when you convert the mass of an atom to the Unified Mass Unit, you can easily just use that value as its molar mass. For example, the Atomic Mass Unit (Unified Mass Unit) is 4u, right? Well there are 4g of helium per mole. That's just the way that Avogadro's number (6.0223x10^23 atoms per mole) was worked out . He made it so that the molecular mass (Unified Mass Unit) of each element would be its molar mass.
Answered by DarkSun - Sun Jan 18 06:42:28 2009
What is the base unit for mass??? (multiple choice) please help me!?
Q. If you can, please send me a link that says this information. if you don'tt and just answer the question,that'ss alright too. Thanks:) So the question was...The base unit for mass is the 1. kilogram. 2. centimeter. 3. degree. 4. meter.
Asked by chikitomybabi - Thu Sep 25 17:23:57 2008 - - 9 Answers - 0 Comments
A. kg. the others are all length or angles.
Answered by TheManWithThePlan - Thu Sep 25 17:28:14 2008
Q. If you can, please send me a link that says this information. if you don'tt and just answer the question,that'ss alright too. Thanks:) So the question was...The base unit for mass is the 1. kilogram. 2. centimeter. 3. degree. 4. meter.
Asked by chikitomybabi - Thu Sep 25 17:23:57 2008 - - 9 Answers - 0 Comments
A. kg. the others are all length or angles.
Answered by TheManWithThePlan - Thu Sep 25 17:28:14 2008
How to compute for the atomic mass unit?
Q. How to compute for the atomic mass unit?
Asked by casey_04 - Mon Jun 16 10:57:50 2008 - - 4 Answers - 0 Comments
Q. How to compute for the atomic mass unit?
Asked by casey_04 - Mon Jun 16 10:57:50 2008 - - 4 Answers - 0 Comments
What is the SI unit for mass?
Q. What is the SI unit for mass?
Asked by Daniel M - Mon Aug 18 19:50:51 2008 - - 6 Answers - 0 Comments
A. Kilograms
Answered by Nikki - Mon Aug 18 19:54:10 2008
Q. What is the SI unit for mass?
Asked by Daniel M - Mon Aug 18 19:50:51 2008 - - 6 Answers - 0 Comments
A. Kilograms
Answered by Nikki - Mon Aug 18 19:54:10 2008
how much energy is produced from each unit mass of carbohydrates?
Q. how much energy is produced from each unit mass of carbohydrates?
Asked by jogo - Wed Jun 24 04:55:22 2009 - - 1 Answers - 0 Comments
A. The generally accepted figure is 4 kcal/gram as food energy.
Answered by oeman50 - Wed Jun 24 06:52:56 2009
Q. how much energy is produced from each unit mass of carbohydrates?
Asked by jogo - Wed Jun 24 04:55:22 2009 - - 1 Answers - 0 Comments
A. The generally accepted figure is 4 kcal/gram as food energy.
Answered by oeman50 - Wed Jun 24 06:52:56 2009
What is the element whose common isotope form is the basis of the atomic mass unit?
Q. What is the element whose common isotope form is the basis of the atomic mass unit?
Asked by Alessandro G - Mon Apr 23 21:32:55 2007 - - 1 Answers - 0 Comments
A. The carbon -12 isotope is the basis of the atomic mass unit. 1 atomic mass unit is defined as (1/12)th of C-12.
Answered by vick - Mon Apr 23 22:11:24 2007
Q. What is the element whose common isotope form is the basis of the atomic mass unit?
Asked by Alessandro G - Mon Apr 23 21:32:55 2007 - - 1 Answers - 0 Comments
A. The carbon -12 isotope is the basis of the atomic mass unit. 1 atomic mass unit is defined as (1/12)th of C-12.
Answered by vick - Mon Apr 23 22:11:24 2007
Heat and mass balances, process simulations, and unit operations in metallurgical processes.?
Q. I'm looking for answer about of heat and mass balances, process simulations, and unit operations in metallurgical processes. what is the properly answer for this question.
Asked by arthur - Sat Feb 9 12:17:05 2008 - - 1 Answers - 1 Comments
A. you dont have a question, you have a collection of nouns. 1. mass in = mass out (thats mass balance) sometimes chemistry is involved. in which case this gets complicated. 2. process simulations (theoretical chemical reactions) require input chemicals, catalysts, machinery to contain it, move it, and process it. 3.Unit operations are the sequence of processes broken out separately. like, shredding incoming steeel scrap. followed by magnetic screening of scrap stream. followed by mixing admixtures (chemicals added to convert scrap into quality steel). this is quite complicated to the unitiated. you may have better luck lookin these up individuallyon the internet or in a local library. wer
Answered by drwer2 - Sat Feb 9 19:43:42 2008
Q. I'm looking for answer about of heat and mass balances, process simulations, and unit operations in metallurgical processes. what is the properly answer for this question.
Asked by arthur - Sat Feb 9 12:17:05 2008 - - 1 Answers - 1 Comments
A. you dont have a question, you have a collection of nouns. 1. mass in = mass out (thats mass balance) sometimes chemistry is involved. in which case this gets complicated. 2. process simulations (theoretical chemical reactions) require input chemicals, catalysts, machinery to contain it, move it, and process it. 3.Unit operations are the sequence of processes broken out separately. like, shredding incoming steeel scrap. followed by magnetic screening of scrap stream. followed by mixing admixtures (chemicals added to convert scrap into quality steel). this is quite complicated to the unitiated. you may have better luck lookin these up individuallyon the internet or in a local library. wer
Answered by drwer2 - Sat Feb 9 19:43:42 2008
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