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Chem Ch. 12&13 Quiz

QuestionAnswer
1) Choose the statement below that is TRUE. A) A solution will form between two substances if the solute-solvent interactions are of comparable strength to the solute-solute and solvent-solvent interactions.
2) Give the major force between ethanol and water. C) hydrogen bonding
3) Give the major force between acetone and chloroform. A) dipole-dipole
4) Which of the following compounds will be most soluble in pentane (C5H12)? B) benzene (C6H6)
5) Which of the following compounds will be most soluble in ethanol (CH3CH2OH)? C) ethylene glycol (HOCH2CH2OH)
6) Which of the following compounds is most soluble in hexane (CH3CH2CH2CH2CH2CH2CH3)? E) 1-pentanol
7) Choose the situation below that would result in a ΔHsolution near 0. D) When |ΔHsolute| is close to |ΔHhydration|
8) Choose the situation below that would result in an exothermic ΔHsolution. C) When |ΔHsolute| < |ΔHhydration|
9) Choose the situation below that would result in an endothermic ΔHsolution. A) When |ΔHsolute| > |ΔHhydration|
10) Which of the following ions should have the most exothermic ΔHhydration? C) Al3⁺
11) Determine DHsolute for KBr if the DHsolution (KBr) = +19.9 kJ/mol and the ΔHhydration(KBr)=-670. kJ/mol. C) +690 kJ/mol
12) Dynamic equilibrium can be defined as A) rate of dissolution = rate of deposition
13) Dissolving is C) rate of dissolution > rate of deposition
14) A solution containing less than the equilibrium amount is called __________. A) an unsaturated solution
15) A solution is formed at room temperature by vigorously dissolving enough of the solid solute so that some solid remains at the bottom of the solution. Which statement below is TRUE? C) The solution is considered saturated.
16) Which of the following statements is generally TRUE? D) The solubility of a solid is highly dependent on temperature.
17) A solid can be purified through what technique? A) recrystallization
18) Identify the compound whose solubility is least affected by temperature. E) NaCl
19) Identify the compound whose solubility decreases with increasing temperature. A) Na2SO4
20) Which of the following statements is TRUE? C) The solubility of a gas is highly dependent on both pressure and temperature.
21) Which of the following statements is TRUE? B) In general, the solubility of a gas in water decreases with increasing temperature.
22) Identify the gas that is dissolved in carbonated sodas. A) carbon dioxide
23) Which of the following should have the largest Henry's law constant (kH) in water? B) CO
32) Which of the following concentration units are temperature dependent? D) molarity
33) Identify the colligative property. E) all of the above
65) Give the reason that antifreeze is added to a car radiator. A) The freezing point is lowered and the boiling point is elevated.
66) Place the following aqueous solutions of nonvolatile, nonionic compounds in order of decreasing osmotic pressure. I. 0.011 M sucrose II. 0.00095 M glucose III. 0.0060 M glycerin A) I > III > II
67) Place the following solutions in order of increasing osmotic pressure. I. 0.15 M C2H6O2 II. 0.15 M MgCl2 III. 0.15 M NaCl E) I < III < II
70) Identify the solute with the highest van't Hoff factor. E) FeCl3
71) Identify the solute with the lowest van't Hoff factor. A) nonelectrolyte
Highest boiling point A) 0.100 m AlCl3
Highest boiling point B) 0.100 m Li2SO4
Lowest Vapor Pressure C) 0.060 m K2CO3
Highest Vapor Pressure E) They all have about the same vapor pressure.
Lowest Freezing Point B) 0.075 m (NH4)3PO4
Highest Freezing Point C) 0.200 m HOCH2CH2OH
79) Fluids used for an intravenous transfusion must be __________ with bodily fluids. A) isosmotic
80) Solutions having osmotic pressures less than those of body fluids are called __________. C) hyposmotic
81) Define smoke as a colloid. B) a solid dispersed in a gas
82) Identify the classification of milk. D) emulsion
83) Identify the classification of opal. E) solid emulsion
84) Identify the classification of whipped cream. C) foam
1) Which cation in each set is expected to have the larger (more negative) hydration energy? I Be2+ or Ca2+ II Rb+ or Zn2+ B) Be2+ in set I and Zn2+ in set II
6) To make a 0.500 M solution, one could take 0.500 moles of solute and add C) enough solvent to make 1.00 L of solution.
9) To make a 2.00 m solution, one could take 2.00 moles of solute and add B) 1.00 kg of solvent.
28) Which of the following solutions will have the lowest freezing point? D) 0.015 m BaCl2
2) Identify the methods used to monitor a reaction as it occurs in the reaction flask. E) all of the above
15) Give the characteristic of a first order reaction having only one reactant. E) The rate of the reaction is directly proportional to the concentration of the reactant.
16) Give the characteristic of a zero order reaction having only one reactant. A) The rate of the reaction is not proportional to the concentration of the reactant.
17) Give the characteristic of a second order reaction having only one reactant. B) The rate of the reaction is proportional to the square of the concentration of the reactant.
22) What are the units of k in a zero order reaction? A) M/s
23) What are the units of k in a first order reaction? E) 1/s
24) What are the units of k in a second order reaction? C) M-1s-1
39) Which of the following represents the integrated rate law for a first-order reaction? A)ln[A]t ---------- = - kt [A]0
42) What data should be plotted to show that experimental concentration data fits a first-order reaction? C) ln[reactant] vs. time
43) What data should be plotted to show that experimental concentration data fits a second-order reaction? D) 1/[reactant] vs. time
44) What data should be plotted to show that experimental concentration data fits a zeroth-order reaction? E) [reactant] vs. time
48) Which of the following statements is FALSE? D) The half life of a first order reaction is dependent on the initial concentration of reactant.
49) How many half-lives are required for the concentration of reactant to decrease to 25% of its original value? E) 2
50) How many half-lives are required for the concentration of reactant to decrease to 12.5% of its original value? A) 3
51) How many half-lives are required for the concentration of reactant to decrease to 1.56% of its original value? A) 6
52) If the concentration of a reactant is 6.25%, how many half-lives has it gone through? D) 4
Created by: isha2326
 

 



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