Choose the correct answer for each question.

- The only intermolecular forces existing between oxygen molecules are:
- permanent dipole forces
- hydrogen bonding forces
- London dispersion forces
- ion-ion attractive forces
- nuclear forces

- Which of the following substances will have the greatest vapor pressure at 0°C?
- NaCl
- H
_{2}O - NH
_{3} - CH
_{4} - H
_{2}O and NH_{3}

- Place the following in order of increasing strength:

1. hydrogen bonding

2. covalent bonding

3. London dispersion forces- 1, 2, 3
- 3, 2, 1
- 1, 3, 2
- 2, 1, 3
- 3, 1, 2

- Which of the following hydrocarbons has the highest boiling point?
- CH
_{4} - C
_{2}H_{6} - C
_{3}H_{8} - C
_{4}H_{10} - These are all gases and do not boil

- CH
- A metal has crystallized with a face-centered cubic lattice. The edge of the unit cell is 366 pm. What is the diameter of the metal atom?
- 518 pm
- 259 pm
- 267912 pm
- 0.0296 pm
- 3.98 x 10
^{-5}pm

- For a solution in a closed container at equilibrium, which of the following pairs represent processes that must be occuring at equal rates?
- evaporation and crystallization
- fusion and boiling
- evaporation and sublimation
- crystallization and sublimation
- evaporation and condensation

The normal boiling point of X is most likely:- 22°C
- 28°C
- 50°C
- 80°C
- 90°C

At a pressure of 1.3 atm and 20°C, compound X exists as:- a solid only
- a solid and a liquid
- a liquid and a gas
- a solid and a gas
- a liquid only

The triple point of compound X occurs at a temperature of:- -10°C
- 23°C
- 50°C
- 80°C
- 29°C

As the pressure increases, the melting point of compound X will:- increase
- decrease
- stay the same
- increase and then decrease
- decrease and then increase

- An example of an amorphous solid is:
- ice
- quartz
- plastic
- diamond
- gold

- Buckminsterfullerene is one of the allotropic forms of:
- silicon
- semimetals
- oxygen
- carbon
- steel

- Which of the following statements is false?

1. Liquids with large intermolecular forces tend to have very low boiling points

2. Liquids with large intermolecular forces tend to have considerable surface tension

3. When a substance changes from a solid to a liquid, the molecules remain intact

4. The hardness of diamond is due to strong dipole-dipole attraction- 1 and 3
- 2 and 4
- 3 and 4
- 1 and 4
- 2 and 3

- Which of the following
an endothermic process?**is not**- crystallization
- vaporization
- melting
- sublimation
- combustion

- How much energy is needed to convert 50.0 g of ice at -5.00°C to water at 25°C?
- Specific heat(ice) = 2.10 J/(g°C)
- Specific heat(water) = 4.18 J/(g°C)
- Heat of fusion = 333 J/g
- Heat of vaporization = 2258 J/g

- 22.4 kJ
- 21.9 kJ
- 37.3 kJ
- 175 J
- 18.0 J

- Specific heat(ice) = 2.10 J/(g°C)
- The correct order for increasing boiling point among the noble gases is:

1. He

2. Ne

3. Ar

4. Kr

5. Xe

This phenomenon is best explained in terms of:- hydrogen bonding
- dipole-dipole interaction
- covalent bonding
- Hund's rule
- London dispersion forces

Chromium metal crystallizes as a body-centered cubic lattice. If the atomic radius of chromium is 125 pm, what is the volume of the unit cell?- 289 cm
^{3} - 2.41 x 10
^{7}cm^{3} - 2.41 x 10
^{-23}cm^{3} - 4.41 x 10
^{7}cm^{3} - 4.41 x 10
^{-23}cm^{3}

- 289 cm
- Chromium metal crystallizes as a body-centered cubic lattice. If the atomic radius of chromium is 125 pm what is the density of chromium metal?
- 2.09 g/cm
^{3} - 7.18 g/cm
^{3} - 7.81 g/cm
^{3} - 2.76 g/cm
^{3} - 18.90 g/cm
^{3}

- 2.09 g/cm
- Aluminum crystallized in a face-centered cubic lattice. How many aluminum atoms can be found per unit cell in this structure?
- 1
- 2
- 3
- 4
- 8

- The triple point of CO
_{2}is 5.2 atm and -57°C. In a laboratory at EDHS, on a day when the pressure is 758 torr and the temperature in the room is 20°C, a solid sample of carbon dioxide will:- freeze
- boil
- melt
- remain solid
- sublime

- How many milliliters of 6.0 M HNO
_{3}are needed to prepare 500 mL of 0.50 M HNO_{3}?- 0.25 mL
- 40 mL
- 15.76 mL
- 300 mL
- None of these are correct

- Which of the following compounds is expected to be the most soluble in water?
- CH
_{3}-CH_{2}-CH_{2}-CH_{3} - CH
_{4} - CH
_{3}-OH - CH
_{3}-CH_{2}-O-CH_{2}-CH_{3} - CH
_{3}-CH_{2}-CH_{2}-CH_{2}-OH

- CH
- Find the mass percent of ZnSO
_{4}in a solution whose density is 1.25 g/mL and whose molarity is 1.19 M.- 15.4 %
- 0.2 %
- 23.0 %
- 78%
- 31.1%

- Find the mole fraction of the ZnSO
_{4}in a solution whose density is 1.25 g/mL and whose molarity is 1.19 M ZnSO_{4}.- 1.02
- 0.575
- 0.0199
- 4.09
- 0.174

- Find the molality of a solution of ZnSO
_{4}whose density is 1.25 g/mL and whose molarity is 1.19 M.- 1.12
*m* - 5.31
*m* - 0.970
*m* - 0.0571
*m* - None of these

- 1.12
- Which of the following solute/solvent pairs best represents the principle of "like dissolves like"?
- carbon dioxide in water
- lipids (fats) in water
- salt in hexane
- hydrogen chloride in water
- potassium iodide in benzene

- The vapor pressure of water at 25.0°C is 23.8 torr. Determine the mass of sodium chloride needed to add to 400 mL of water to change the vapor pressure to 22.8 torr. Assume the density of water to be 1.0 g/mL.
- 0.12 g
- 54 g
- 117 g
- 8.15 g
- None of these

- Of the following compounds, which are not likely to increase in solubility as the temperature of the solution increases?

1. CH_{4}

2. NaBr

3. CO_{2}

4. Glucose, C_{6}H_{12}O_{6}

5. CuSO_{4}- 1 and 4
- 2 and 3
- 1 and 3
- 4 only
- 5 only

- At a given temperature the vapor pressure of pure liquid diethyl ether and isopropyl alcohol are 730 torr and 310 torr, respectively. A solution prepared by mixing isopropyl alcohol and diethyl ether obeys Raoult's law. At this temperature, what is the vapor pressure of diethyl ether over a solution in which its mole fraction is 0.270?
- 197 torr
- 281 torr
- 1040 torr
- 15.7 torr
- 0.912 torr

- Which of the following properties is dependent on the amount
__and__identity of the solute particles?- Freezing point of the solution
- Boiling point of the solution
- Osmotic pressure
- Solution density
- None of these

- How many grams of Al
_{2}(SO_{4})_{3}do you need to make 87.62 g of 0.0162*m*Al_{2}(SO_{4})_{3}solution?- 5.54 g
- 0.483 g
- 0.0751 g
- 194 g
- 1005 g

- When 18.0 grams of a substance is dissolved in 500 grams of water, the freezing point is depressed by 0.31°. What is the molar mass of the solute?
- 3.0 g
- 108 g
- 216 g
- 54 g
- 1018 g

- You are given the problem of lowering the freezing point of H
_{2}O from 0°C to 0°F (-17.8°C), what volume of methyl alcohol (CH_{3}OH) should you add to 10.0 liters of H_{2}O? The density of CH_{3}OH is 0.787 g/mL. Assume the density of the water to be exactly 1.00 g/mL.- 32.05 mL
- 316 mL
- 402 mL
- 4.02 L
- None of these

- Two sodium chloride solutions are separated by a semipermeable membrane. The concentration of solution "A" is 0.50 M and the concentration of solution "B" is 0.250 M. Over time, there will be a measurable movement of:
- water from solution A to B
- water from solution B to A
- sodium chloride from solution A to B
- sodium chloride from solution B to A
- Two of these are correct

- The expected (ideal) van't Hoff factor for a dilute solution of sodium sulfate is:
- 1
- 2
- 3
- 4
- 5

- A 0.250 M solution of CaCl
_{2}has an observed osmotic pressure of 10.1 atm at 23°C. Determine the observed van't Hoff factor for this experiment.- 1.67
- 2.73
- 1.22
- 0.976
- 0.002

- How many grams of calcium chloride are needed to prepare 300 mL of a 0.250 M solution?
- 832 g
- 5.66 g
- 566 g
- 112 g
- 8.32 g

- Calculate the osmotic pressure (in torr) of 7.50 liters of an aqueous 0.210 M solution of silver nitrate at 25°C, assuming 100% dissociation.
- 10.3 torr
- 7.81 x 10
^{3}torr - 0.86 torr
- 655 torr
- 1100 torr

- Which of the following solutions would be expected to experience the largest deviation from the expected van't Hoff factor?
- 1.5 M NaCl
- 0.5 M CH
_{3}OH - 1.0 M glucose
- 0.010 M NaCl
- Both NaCl solutions would have the same deviation

- What is the percentage by mass of ethanol (C
_{2}H_{5}OH) in a 1.5*m*solution?- 65%
- 29%
- 18.8%
- 6.5%
- 0.057%

- The rate law for a particular reaction is determined to be R = k[A]
^{2}[B]^{2}. What is the overall order for this reaction?- zero
- first
- second
- third
- fourth

- KClO
_{3}decomposes according to the reaction:2KClOIf the rate of decomposition of potassium chlorate at a certain time is determined to be 2.4 x 10_{3}→ 2KCl + 3O_{2}^{-2}mol s^{-1}. What is the rate of formation of O_{2}at the same time?- 2.4 x 10
^{-2}mol s^{-1} - 1.2 x 10
^{-2}mol s^{-1} - 3.6 x 10
^{-2}mol s^{-1} - 7.2 x 10
^{-2}mol s^{-1} - 1.6 x 10
^{-2}mol s^{-1}

- 2.4 x 10
- For a reaction between X and Y, the following data was obtained:What is the rate law for this reaction?
**[X]**_{0}**[Y]**_{0}**Initial Rate**0.10 0.10 2.0 x 10 ^{3}0.20 0.10 4.0 x 10 ^{3}0.10 0.20 8.0 x 10 ^{3}- R = k[X][Y]
- R = k[X]
^{2}[Y]^{2} - R = k[X][Y]
^{2} - R = k[X]
^{2}[Y] - R = k[Y]
^{2}

- For the following reaction:A → B + Cthat is second order, a linear plot will result when time is plotted against:
- ln[A]
- [A]
- 1/[A]
- ln[B]
- ln[B][C]

- For a first order reaction with a rate constant k = 1.2 x 10
^{-3}s^{-1}, how long will it take for the amount of reactant to be decreased from 0.10 mol to 0.05 mol?- 580 seconds
- 6.7 seconds
- 8.3 x 10
^{3}seconds - 8.3 x 10
^{2}seconds - none of these

- For a first order reaction with a rate constant k = 3.13 x 10
^{2}s^{-1}, how long does it take for the concentration of the only reactant to become 40% of the original amount?- 0.00128 seconds
- 0.00293 seconds
- 0.0450 seconds
- 0.00479 seconds
- 43.2 seconds

- For a second order reaction with a rate constant k = 3.13 x 10
^{2}L mol^{-1}s^{-1}, how long does it take for the concentration of the only reactant to become 70% of the original amount?- 0.00137 seconds
- 0.00746 seconds
- 0.00114 seconds
- 0.0761 seconds
- 0.912 seconds

- Catalysts lower the activation energy of a reaction by:
- adding heat to the reaction system
- providing an alternate pathway for the reaction
- increasing the energy content of the reactants
- changing the value of Δ
*H*for the reaction - none of these

- The following data give the concentration of gaseous butadiene as a function of time at 500 K. Determine the order of the reaction, and the value of the rate constant.
t(sec) C(moles/liter) 195 1.62 x 10 ^{-2}604 1.47 x 10 ^{-2}1246 1.29 x 10 ^{-2}2180 1.10 x 10 ^{-2}4140 0.89 x 10 ^{-2}4655 0.80 x 10 ^{-2}6210 0.68 x 10 ^{-2}8135 0.57 x 10 ^{-2}- first order, k = 1.4 x 10
^{2}s^{-1} - first order, k = 1.4 x 10
^{-2}L mol^{-1}s^{-1} - second order, k = 1.4 x 10
^{-2}L mol^{-1}s^{-1} - second order, k = 1.4 x 10
^{2}L mol^{-1}s^{-1} - zero order, k = -1.4 x 10
^{-2}mol L^{-1}s^{-1}

- first order, k = 1.4 x 10
- The reaction X
_{2}Y → 2X + Y is determined to be first order. What is the integrated rate law for this reaction?- ln[2X + Y] = kt - ln[2X + Y]
_{0} - (1/[X
_{2}Y]) = -kt + (1/[X_{2}Y]_{0}) - [X
_{2}Y] = -kt + [X_{2}Y]_{0} - ln[X
_{2}Y] = -kt + ln[X_{2}Y]_{0} - (1/[2X + Y]) = -kt + (1/[2X + Y]
_{0})

- ln[2X + Y] = kt - ln[2X + Y]
- A certain first-order reaction is 50.0% complete in 4.25 minutes. What is the rate constant for this reaction?
- 0.163 min
^{-1} - 2.95 min
- 6.13 min
- [A]
_{0}/(2t_{1/2}) - 0.0252 min
^{-1}

- 0.163 min
- A certain first order decomposition reaction reaches 65% completion in 18.9 seconds. What is the rate constant for this reaction?
- 18 s
^{-1} - 19.8 s
^{-1} - 9.56 x 10
^{-2}s^{-1} - 2.38 x 10
^{-2}s^{-1} - 5.55 x 10
^{-2}s^{-1}

- 18 s
- The activation energy for the reaction:

Xis 125 kJ/mol and Δ_{2}(*g*) + Y_{2}(*g*) → 2XY(*g*)*E*for the reaction is -45 kJ/mol. The activation energy for the decomposition of XY is:- 45 kJ/mol
- 80 kJ/mol
- 170 kJ/mol
- -80 kJ/mol
- -125 kJ/mol

- Increasing the temperature at which a reaction occurs speeds up the reaction by:
- increasing the frequency of collisions
- increasing the energy of collisions
- activating catalysts
- improving the orientation of collisions
- two of these

- Which of the following statements is TRUE for the catalyzed and uncatalyzed versions of the same reaction?
- The activation energies are the same
- The reaction pathway is the same
- The energy content of the reactants is higher for the uncatalyzed reaction
- Δ
*E*is the same - The energy content of the activated complex is higher for the catalyzed reaction