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The Principles of Generally Chemistry by Silberberg - Chap - 12 and 13 | CHEM 117, Exams of Chemistry

Old Dominion UniversityChemistry
Prof. John Cooper

Chapters 12 & 13 from the principals of generaly chem by silberburg Material Type: Exam; Professor: Cooper; Class: PRINCIPLES OF CHEMISTRY; Subject: Chemistry and Biochemistry; University: Old Dominion University; Term: Spring 2009;

Typology: Exams

Pre 2010

Uploaded on 03/17/2009

ahugg002
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116/117 TEST#1, COOPER, SPRING 2009
_________________________________
(students honor pledge signature)
Constants You May Need
Cwater vapor = 33 J/(mol C) Cice = 38 J/(mol C) Cliquid water = 75 J/(mol C)
TFP(water) = 0C at 1 atm TBP(water) = 100C at 1 atm 760 torr = 1 atm
Hvaporization (water) = 41 kJ/mol Hfusion (water) =6 kJ/mol
MWdiethylether = 74 g/mol MWethanol = 46 g/mol MW(water) = 18 g/mol
AWbarium = 137 g/mol Kb (water) = 0.5 C/m Kf (water) = 1.9 C/m
Select the best answer and mark clearly on opscan. Hand in scan sheet, test, and all work.
Each question is worth 5 points.
1. Which of the following is not an intermolecular force?
a) covalent b) ion-dipole c) dipole-dipole d) dispersion e) none
2. Which of the following is exothermic?
a) melting b) vaporizing c) condensing d) subliming e) none
3. Which substance would have a higher heat of vaporization?
a) argon b) methane (CH4) c) methanol (CH3OH) d) water e) NaCl
4. What is the strongest force holding methanol (CH3OH) in the liquid state at 25C?
a) dipole-dipole b) ionic c) dispersion d) hydrogen bonding e) all of these contribute
5. Which substance would have the higher solubility in water?
a) He b) O2 c) N2 d) CO e) NO
6. Which of the following is most accurate?
a) hydrogen bonding increases surface tension
b) dispersion forces increase surface tension
c) both hydrogen bonding and dispersion forces increase surface tension
d) neither hydrogen bonding nor dispersion forces increase surface tension
e) Surface tension depends only on the liquids polarity
7. An increase in temperature would decrease the conductivity of which substance?
a) iron b) helium c) water d) silicon e) all of these
8. Which of the following exhibit hydrogen bonding?
a) H2S b) CH3OH c) NH3 d) both a and b e) both b and c
9. A water soluble salt has a very large lattice energy and a very low hydration energy. What best
accounts for its solubility?
a) solvation energy b) weak ionic bonding c) entropy d) heat of vaporization e) all of these
10. For the previous question, which best describes dissolving the salt?
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Download The Principles of Generally Chemistry by Silberberg - Chap - 12 and 13 | CHEM 117 and more Exams Chemistry in PDF only on Docsity!

116/117 TEST#1, COOPER, SPRING 2009

_________________________________

(students honor pledge signature) Constants You May Need Cwater vapor = 33 J/(mol C) Cice = 38 J/(mol C) Cliquid water = 75 J/(mol C) TFP(water) = 0C at 1 atm TBP(water) = 100C at 1 atm 760 torr = 1 atm Hvaporization (water) = 41 kJ/mol Hfusion (water) =6 kJ/mol MWdiethylether = 74 g/mol MWethanol = 46 g/mol MW(water) = 18 g/mol AWbarium = 137 g/mol Kb (water) = 0.5 C/m Kf (water) = 1.9 C/m Select the best answer and mark clearly on opscan. Hand in scan sheet, test, and all work. Each question is worth 5 points.

  1. Which of the following is not an intermolecular force? a) covalent b) ion-dipole c) dipole-dipole d) dispersion e) none
  2. Which of the following is exothermic? a) melting b) vaporizing c) condensing d) subliming e) none
  3. Which substance would have a higher heat of vaporization? a) argon b) methane (CH 4 ) c) methanol (CH 3 OH) d) water e) NaCl
  4. What is the strongest force holding methanol (CH 3 OH) in the liquid state at 25C? a) dipole-dipole b) ionic c) dispersion d) hydrogen bonding e) all of these contribute
  5. Which substance would have the higher solubility in water? a) He b) O 2 c) N 2 d) CO e) NO
  6. Which of the following is most accurate? a) hydrogen bonding increases surface tension b) dispersion forces increase surface tension c) both hydrogen bonding and dispersion forces increase surface tension d) neither hydrogen bonding nor dispersion forces increase surface tension e) Surface tension depends only on the liquids polarity
  7. An increase in temperature would decrease the conductivity of which substance? a) iron b) helium c) water d) silicon e) all of these
  8. Which of the following exhibit hydrogen bonding? a) H 2 S b) CH 3 OH c) NH 3 d) both a and b e) both b and c
  9. A water soluble salt has a very large lattice energy and a very low hydration energy. What best accounts for its solubility? a) solvation energy b) weak ionic bonding c) entropy d) heat of vaporization e) all of these
  10. For the previous question, which best describes dissolving the salt?

a) exothermic b) endothermic c) the liquid temperature remains the same d) b and c e) none

  1. Which has the highest dispersion forces? a) C 2 H 6 b) C 3 H 8 c) C 4 H 10 d) C 5 H 12 e) all alkanes (CnH2n+2) have similar dispersion
  2. Which alcohol is most soluble in water? a) CH 3 OH b) CH 3 CH 2 OH c) CH 3 CH 2 CH 2 OH d) CH 3 CH 2 CH 2 CH 2 OH e) all are similar
  3. Which aqueous solution has the lowest vapor pressure? a) 0.1 m NaCl b) 0.1 m CaCl2 c) 0.4 m glucose d) 0.3 m FeCl3 e) 0.4 m HCl
  4. Which aqueous solution has the highest freezing point? a) 0.1 m NaCl b) 0.1 m CaCl2 c) 0.4 m glucose d) 0.3 m FeCl3 e) 0.4 m HCl
  5. Which aqueous solution has the highest osmotic pressure? a) 0.1 m NaCl b) 0.1 m CaCl2 c) 0.4 m glucose d) 0.3 m FeCl3 e) 0.4 m HCl 16.What is the concentration in ppm of a solution which contains 1g of solute and 1000kg of solution? a) 0.01 b) 0.1 c) 1 d) 10 e) 1000 17.How much heat is needed to convert 18 g of water vapor at 100C to ice at -100C? Assume 1 atm pressure. a) 53kJ b) -53kJ c) -55kJ d) 58 kJ e) -58kJ 18.For a sealed 10.0L container which contains 10.0 ml of water, what is the mass (g) of water in the vapor phase once the container reaches equilibrium at 10C. a) 0.1 b) 0.5 c) 1 d) 10 e) 0. 19.What is the mol fraction of diethyl ether in the vapor phase above a solution which is 20% by mass diethyl ether in ethanol at room temperature in? At, room temperature, the vapor pressure of diethyl ether is 480 torr and the vapor pressure of ethanol is 50 torr. a) 0.2 b) 0.4 c) 0.6 d) 0.8 e) 1 20.If the volume of a Barium atom is 4.3x10-23 cm3/barium atom, and barium forms a bcc lattice, what is the approximate density of barium (g/cm^3 )? a) 3.6 b) 5.3 c) 2.8 d) 4.1 e) 1. 21.What is the boiling point ( C ) of an aqueous 1 m NaCl solution? a) 100.1 b) 100.5 c) 99.5 d) 99.05 e) 101 22.If the osmotic pressure of a solution at room temperature (25C) is 5 torr, and the solution was made by diluting 10 mg of a protein to a volume of 1 ml with water, what is the molecular weight of the protein? a) 37207 g/mol b) 37414 g/mol c) 3721 g/mol d) 374 g/mol e) 37 g/mol