What attractive force(s) must be overcome to boil liquid ammonia NH3?
Q. ion dipole forces, hydrogen bonds, covalent bonds, dispersion forces, and/or ion- ion forces
Asked by AK - Tue Dec 2 15:06:24 2008 - - 1 Answers - 0 Comments
Which substance exhibits hydrogen bonding in the liquid state: PH3, H2, H2S, CH4, or NH3?
Q. Which substance exhibits hydrogen bonding in the liquid state: PH3, H2, H2S, CH4, or NH3?
Asked by Danielle - Mon Jun 15 20:35:25 2009 - - 2 Answers - 0 Comments

A. Hydrogen bonding occurs when H is covalently bonded to N, O or F. Therefore, the compound that exhibits hydrogen bonding is ammonia, NH3. === Follow up === Yes, the Old Science Guy is incorrect. H2S does not exhibit hydrogen bonding. Again, hydrogen bonding occurs only when H is covalently bonded to N, O or F. It's the combination of the small size of the anion and the high electronegativity that polarizes the H-X bond sufficiently. If there was going to be another element which bonded to H and produced hydrogen bonding it would be chlorine, not sulfur. Chlorine is more electronegative than sulfur and it is smaller than sulfur. Yet there is not hydrogen bonding in HCl. So there would be none in H2S.
Answered by pisgahchemist - Mon Jun 15 20:40:52 2009

What liquid make a good solvent for iodine?
Q. HCl, H20, CH3OH, NH3, CS2
Asked by allie - Tue Feb 20 20:50:56 2007 - - 2 Answers - 0 Comments

A. Iodine is more soluble in an alcohol such as CH3OH (methanol). Solutions made with alcohol as the solvent are called "tinctures." In the old days we were always covered with orange stripes from the "tincture of iodine" that the schools and mothers would use to treat all of our cuts.
Answered by physandchemteach - Tue Feb 20 21:16:18 2007

When the following equation is balanced, what is the mole ratio of H20 to Be3N2?
Q. When the following equation is balanced, what is the mole ratio of H20 to Be3N2? Be3N2 + H2O (liquid) ~~> Be(OH)2 + NH3 (gas) How is this equation balance? 3:1 3:2 2:3 6:1 1:3
Asked by cc221112 - Wed Feb 4 16:16:37 2009 - - 1 Answers - 0 Comments

A. 3H2O : Be3N2
Answered by Eric MP S - Wed Feb 4 16:27:28 2009

Which is the best conductor in the liquid state?
Q. 1. H2O 2. H2Te 3. Br2 4. PH3 5. H2S 6. GeH4 7. CH4 8. Cl2 9.NH3 10. KBr
Asked by mel m - Sun Nov 16 00:12:15 2008 - - 2 Answers - 0 Comments
Which of the following are soluble in each other?
Q. Which of the following are soluble in each other? Label as soluble or insoluble (i) NaCl and liquid NH3 ___ (ii) C3H8 and C8H18 ___ (iii) CH3Cl and C2H5OH ___ (iv) H2O and liquid H2S ___
Asked by Kat B - Wed Jun 24 22:39:54 2009 - - 1 Answers - 0 Comments

A. They are all Soluble---i) polar, polar---ii) non polar, non polar---iii) polar, polar---iiv) polar,polar
Answered by coolerbeers - Thu Jun 25 16:03:39 2009

Can anyone explain why this reaction occurred with pH paper?
Q. My teacher did an experiment where she put an orange yellow paper on the board and sprayed Windex on it. The paper turned red. Why did this happen? I know NH3 is in Windex and that Windex is a base, but what happened to the paper? What caused this to happen? Then she sprayed another liquid that was unknown and it turned the paper back to its original color. What happened to the paper here?
Asked by Amanda F - Tue May 12 22:46:41 2009 - - 2 Answers - 0 Comments

A. The Windex has acid in it turning the the paper (Orange litmus paper) red Your teacher must have sprayed a alkaline which neutralizes the acid and turns the litmus paper back to its original colour.
Answered by unknown - Tue May 12 22:56:09 2009

Determine the standard heat of formation of liquid hydrazine, N2H4?
Q. Determine the standard heat of formation of liquid hydrazine, N2H4(l) from the following data: a) 2 NH3(g) + 3 N2O (g) 4N2(g) + 3 H2O(l) ; H(degree) = -1010 kJ b) N2O (g) + 3 H2(g) N2H4(l) + H2O(l) ; H(degree) = -317 kJ c) 2 NH3(g) + O2(g) N2H4(l) + H2O(l) ; H(degree) = -143 kJ d) H2(g) + O2(g) H2O(l) ; H(degree) = -286 kJ
Asked by unknown - Tue Sep 1 19:06:35 2009 - - 1 Answers - 0 Comments

A. Add 3*b to c and you get: 2NH3 + 3N2O + 1/2O2 + 9H2 = 4N2H4 + 4H2O H=-3*317-143 = -1094 kJ Now subtract a): 4N2 + 3H2O +1/2O2 + 9H2 = 4N2H4 + 4H2O H = -1094 kJ + 1010 kJ = -84 kJ. Cancel H2O 4N2 +1/2O2 + 9H2 = 4N2H4 + H2O H = -84 kJ. Now subtract d) 4N2 + 8H2 = 4N2H4 H = -84 + 286 = 202 kJ Divide by 4: N2 + 2H2 = N2H4 H = 202/4 = 50.5 kJ/mol
Answered by unknown - Thu Sep 3 12:03:18 2009

What is the heat of reaction at constant pressure? CH4(g) + NH3(g) --> HCN(g) + 3H2(g)?
Q. Hydrogen cyanide is a highly poisonous, volatile liquid. It can be prepared by the following reaction: CH4(g) + NH3(g) --> HCN(g) + 3H2(g) What is the heat of reaction at constant pressure? Use the following thermochemical equations. N2(g) + 3H2(g) --> 2NH3(g) change H = -91.8 kJ C(graphite) + 2H2(g) --> CH4(g) change H = - 74.9 kJ h2(g) + C(graphite) + N2(g) --> 2HCN(g) change H = 270.3kJ
Asked by El Vez - Tue Oct 28 02:23:11 2008 - - 1 Answers - 0 Comments

A. Use Hess's Law: H = Hf(products) - Hf(reactants) H = (270.3)/2 - {(-74.9) + (-91.8)/2} = 256.0 kJ
Answered by mRNA - Tue Oct 28 02:38:25 2008

List the most important (strongest) intermolecular force(s) that must be overcome to...?
Q. List the most important (strongest) intermolecular force(s) that must be overcome to (a) remove water of hydration from CuSO4 5H2O (b) melt solid MgF2 (c) vaporize liquid NH3
Asked by K.K - Fri Jan 23 21:23:26 2009 - - 1 Answers - 0 Comments

A. a) London Dispersion Forces b) ionic bonding c) hydrogen bonding
Answered by ninjamayn - Fri Jan 23 21:50:20 2009

2 chemistry questionss! please help.?
Q. When the electrons of an excited atom return to a lower energy state, the energy emitted can result in the production of (1) alpha particles (2) isotopes (3) protons (4) spectra Which phase change is an exothermic process? (1) CO2 (solid) --> CO2 (gas) (2) Cu (solid) --> Cu (liquid) (3) NH3 (gas) --> NH3 (liquid) (4) Hg (liquid) --> Hg (gas) please explain whyy =]
Asked by Hey - Sun Jun 1 13:10:56 2008 - - 3 Answers - 0 Comments

A. First one: (4), spectra. Spectra is another way of saying light. When you look at streetlamps, the orange light is caused when electricity causes electrons in the sodium within the light to be excited to a higher energy state. When they return, light is emitted. Second one: (3), NH3(g) --> NH3(l) An exothermic process is one during which heat is given out. The other three involve changes to a more energergetic state and so would require an input of energy, making them all endothermic.
Answered by cstspeedy - Sun Jun 1 13:26:05 2008

__ NH3(g) + __ O2 (g) __ NO(g) + __ H2O (l)?
Q. Using LeChatelier's principle, predict the direction of the net reaction in the following system, as a result of stress that is applied to the following (unbalanced) exothermic reaction 1. Remove H2O (l)- it is liquid is there any shift 2.Increase the volume of the reaction vessel 3.Add N2 gas 4.Add O2 gas 5.Add a catalyst 6.Decrease the tempeature of the reaction
Asked by la - Tue Dec 2 02:10:43 2008 - - 1 Answers - 0 Comments

A. 4,5,4,6 1. Not affected since water is liquid and not gas. 2. Volume increases means pressure decreases so shift left. 3. Shift right cos Add N2 does not affect anythjing but increases pressure 4. Shift right cos more O2 to react so shift right. 5. Will not shift. 6. Since exothermic, will shift right
Answered by eljx2004 - Tue Dec 2 02:33:53 2008

What is organic, inorganic, binary covalent compounds?
Q. 1. Which of the following is an inorganic compound? H2CO2 NaCN HC2H3O2 NaC2O4 C6H12O6 2. Which of the following is a binary covalent compound? NO2 NaNO3 C2H5O CaO Na2O 3. Which of the following substances is not made of molecules? NH3 CO O2 ClO2 CuCl2 4. Which of the following is an organic compound? CaCO3 SiO2 N2O4 NaC2H3O2 Cu(OH)2 5. Which of the following substances must be covalent? KBr CaCl2 Cs2O NaF F2 6. Which of the following is a characteristic of covalent compounds? always contain both cations and anions made of molecules liquid forms conduct electricity well bonding involves transfer of electrons between atoms usually made of metals and nonmetals
Asked by Pops P - Thu Nov 2 04:20:37 2006 - - 1 Answers - 0 Comments

A. 1. NaCN 2. NO2 3. CuCl2 4. NaC2H3O2 5. F2 6. bonding involves transfer of electrons between atoms
Answered by titanium007 - Thu Nov 2 06:01:12 2006

Which Intermolecular force...?
Q. What intermolecular force is needed to overcome... 1. Convert liquid NH3 to NH3 vapor 2. Melting ice 3. Remove water of hydration from MnCl2.4H2O 4. Melt solid I2
Asked by NG Yut Sei - Mon Apr 30 09:31:43 2007 - - 1 Answers - 0 Comments

A. 1) NH3: hydrogen bonding 2) ice: hydrogen bonding needs to be overcome 3) coordinate covalent bonds between water and Mn 4) I2: London dispersion forces
Answered by ihatedecaf - Mon Apr 30 12:24:22 2007

Organic Chemistry help...?
Q. Which is NOT a satisfactory procedure for the synthesis of 3-methyl-1-butene? a.1,2-Dibromo-3-methylbut ane with NaI in acetone b. 2-Bromo-3-methyl butane and (CH3)3COK in t-butanol c. 3-methyl-1-butyne and Li in liquid NH3 d. 3-methyl-2-butanol (3-methylbutan-2-ol) and concentrated H2SO4 e. 3-methyl-1-butyne and H2/Ni2B
Asked by tiffanee86 - Sat Apr 7 21:04:23 2007 - - 1 Answers - 0 Comments

A. I think A is not a satisfactory procedure... reagent to be used is applicable for substitution reaction... also the substrate 1,2 dibromo-3-methylbutane... is quite inert...its difficult to remove the 2 bromines
Answered by kirin - Sat Apr 7 21:43:22 2007

Chem Questions on the Calculation of Density?
Q. I need help with my chem lab questions: "the density of ammonia, NH3 is .77 g/I what is the mass of 11 L?" "if the accepted value for the Density of liquid A is 0.79 g/ml, calculate your percent error using density you calculated for liquid A"
Asked by Moriahhhh - Mon Sep 28 21:31:14 2009 - - 4 Answers - 0 Comments

A. 0.77g/L * 11L = 8.47gNH3 (0.79-0.77)/0.79 * 100% = 2.53%error
Answered by unknown - Mon Sep 28 21:44:00 2009

Which of the following liquids would make a good solvent for bromine, Br2?
Q. 1. CH3OH 2. CS2 3. H2O 4.NH3
Asked by mjbennett07 - Thu May 14 15:03:26 2009 - - 2 Answers - 0 Comments
A chemistry question,can you help?
Q. which attraction force(s) must be overcome in order to boil liquid ammonia, NH3? (A) Dispersion forces (B) ion-dipole forces (c) hydrogen bonds (d) covalent bonds (e) ion-ion forces
Asked by amilo99 - Sun Feb 15 00:57:36 2009 - - 4 Answers - 0 Comments

A. to boil a compound, you need to break the attractive forces between different molecules. The "intermolecular" forces. not A. dispersion forces overcome intermolecular forces to seperate particles in solution. not B. ion-dipole forces are intramolecular (within a single molecule) forces. Definitely C. hydrogen bonding occurs between the H of one molecule and the N of another due to the permanent dipole moment within ammonia. Hydrogen bonding is an intermolecular attractive force between molecules not D. you are NOT breaking the covalent bonds between N and H to undergo a phase change. That would be a "chemical reaction" phase change are NOT chemical reactions. not E. this implys that there is some force of attraction… [cont.]
Answered by m w - Sun Feb 15 18:04:40 2009

Chemister Acid/Base?
Q. 87. like water, ammonia undergoes autoionization in liquid ammonia: NH3+ NH3--> NH4+ + NH2- a) identify the Bronsted acids and Bronsted bases in this reaction. b) What species correspond to H+ and OH-, and what is the condition for a neutral solution?
Asked by -=Ward Rose=- - Sun Mar 2 11:28:19 2008 - - 1 Answers - 0 Comments

A. NH3 => base NH4+ => acid NH3 => acid NH2- => base for NH3/ NH4+ => OH- /H+ for NH3/ NH2- => H+ / OH-
Answered by Dr.A - Sun Mar 2 11:39:03 2008

Which GAS would most likely obey HENRY'S LAW?
Q. Henry's law states that as the pressure on liquid increases, the solubility of the gas increases, which makes sense because in a coke bottle, the gas is not released but when opened, it comes out. the gases are HCl , SO2, NH3, O2 .. in any liquid i guess.. thankss =]
Asked by luhb u much!! - Sun Jan 25 14:43:59 2009 - - 1 Answers - 0 Comments

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