Solubility
Which one of the following would be the most soluble in CH3OH?
a. I2 b. HBr c. Kr d. CO2
HBr
CaCl2
CH3CH2OH
K3PO4
C6H12O6
C6H13OH
LiNO3
1
4
1
1
2
What is the equation for rate and rate law
rate= change in concentration/change in time;
rate law: k [A]^m [B]^n
What is the overall reaction order for a reaction that follows the rate law rate= k [NO]2[H2]4
6
Why is butane (C4H10) not miscible with water?
a. butane is more dense than water
b. butane is polar
c. water prefers interacting with other molecules
d. butane is larger than water
water prefers interacting with other molecules
A solution is prepared by dissolving 23.7 g of CaCl2 (MW=111 g/mol) in 375 g of water. What is the molality of the CaCl2 solution?
a. 0.569 m
b. 1.12 m
c. 1.14 m
d. 5.94 m
a. 0.569 m
Which of the following plays a part in determining the rate of a chemical reaction? Select all that apply
a. temperature
b. concentration of reactants
c. presence of a catalyst
ALL
A catalyst changes
i) the forward activation energy Ea(f).
ii) the reverse activation energy Ea(r).
iii) the rate of the reaction
all
What is the nature of the intermolecular forces that exist between molecules of CH4 and C6H6 when they dissolve in each other?
London Dispersion
If you drink a 500 mL glass of tap water that is 0.01 part per million (ppm) lead, how many grams of lead
have you consumed? (Assume the density of the solution is 1.0 g/mL.)
a. 5 × 10-8 g
b. 5 × 10-6 g
c. 0.005 g
d. 5 g
b. 5 × 10-6 g
The reaction of butyl chloride with water proceeds according to the equation below. Which statement is correct?
C4H8Cl12(l) + 2 H2O(l) → C4H10O2(aq) + 2 HCl(aq)
a. C4H8Cl2 and C4H10O2 both disappear at the same rate.
b. C4H8Cl2 disappears at the same rate that HCl appears.
c. HCl appears at twice the rate that C4H10O2 appears.
d. C4H8Cl2 disappears at twice the rate that C4H10O2 appears.
c. HCl appears at twice the rate that C4H10O2 appears.
The equilibrium constant for the following reaction is K=4.2 × 1052 at 25 °C.
1/8 S8(s) + O2(g) ⇌ SO2(g)
this means that
a. at equilibrium there will be mostly S8(s) and O2(g) present.
b. at equilibrium the concentration of SO2(g) will be extremely low.
c. the reaction is very fast.
d. at equilibrium the reaction lies far to the right.
d. at equilibrium the reaction lies far to the right.
33. Which one of the following steps in the dissolution of sodium chloride is endothermic? Select all.
Separation of the water molecules.
Separation of the ions in the solid salt.
Hydration (solvation) of the ions from the salt by water molecules.
Separation of the water molecules.
Separation of the ions in the solid salt.
Water has a freezing point constant (Kf ) of 1.86 °C/m. What is the freezing point of a 0.100 molal solution of NaCl?
a. -0.372 °C
b. 0.186 °C
c. -1.86 °C
d. 0.372 °C
a. -0.372 °C
Time (s) [A] (mol/L)
0.0 0.200
10.0 0.140
20.0 0.100
30.0 0.071
40.0 0.050
What is the average rate (mol L-1 s-1) between 10 s and 20 s?
4.0 × 10-3
What is the correct equilibrium expression for the reaction below
H2O (l) + CO32- (aq) <=> OH- (s) + HCO3- (aq)
Keq= [HCO3-]/[CO32-]
N2 gas is relatively _________ in water. Increasing the N2 pressure over the water will ________ its solubility.
a. insoluble, decrease
b. soluble, decrease
c. insoluble, no effect
d. insoluble, increase
d. insoluble, increase
40. Determine the boiling point of a solution prepared by dissolving 56.0 g of Na2SO4 (FW = 142) in 350 g of water. The Kb for water is 0.52 ºC/m.
a. 98.2 °C
b. 100.6 °C
c. 101.8 °C
d. 104.1 °C
a. 98.2 °C
b. 100.6 °C
c. 101.8 °C
d. 104.1 °C
2 A + B → C
Exp. Initial [A] Initial [B] Initial Rate
1 0.015 0.022 0.125
2 0.030 0.044 0.500
3 0.060 0.044 1.000
4 0.060 0.088 2.000
a. rate = k[A]2[B]2
b. rate = k[A][B]
c. rate = k[A][B]2
d. rate = k[A]2[B]
b. rate = k[A][B]
The reaction A + 2 B → AB2 is thought to proceed according to the following mechanism:
B + B → B2 (slow)
B2 + A → AB2 (fast)
Which rate law would be consistent with this mechanism?
a. rate = k[A][B]2
b. rate = k[B]2
c. rate = k[A][B]
d. rate = k[A]2[B]
b. rate = k[B]2