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Unit 10: Kinetics/Equilibrium
Test Description: Unit 10 Review
Instructions: Answer all questions to get your test result.
1) In a sealed container that is half full of water, equilibrium will be reached when the water molecules:
A
are equal in number for both the liquid and the gas phase
B
stop evaporating
C
evaporate and condense at the same rate
D
begin to condense
2) Given NO2 (g) + CO(g) <--> NO(g) + CO2(g) what action will shift the reaction to the LEFT?
A
removing some CO2 gas from the flask
B
increasing the NO concentration in the flask
C
raising the total pressure inside the flask
D
pumping CO gas into the closed flask
3) Given NH4Cl(g) + heat <--> NH3(g) + HCl what kind of change will shift the reaction to the right?
A
a decrease in pressure
B
an increase in the concentration of HCl
C
a decrease in temperature
D
an increase in the pressure of NH3
4) When a reaction is at equilibrium and more reactant is added, which changes as the result?
A
the forward reaction rate decreases
B
the forward reaction rate increases
C
the reverse reaction rate decreases
D
the reverse reaction rate increases
5) In which of the following reactions involving gases would the forward reaction be favored by an increase in pressure?
A
A + B ↔ C + D
B
A + B ↔ AB
C
AC ↔ A + C
D
2A + B ↔ C + 2D
6) Given 4 HCl (l) + O2 (g) <--> 2H2O (l) + 2 Cl2 (g) + 113 kJ which action will favor the reverse reaction?
A
increase the pressure
B
increase the system\'s temperature
C
increase the oxygen concentration
D
decrease the pressure
7) Assume that the potential energy of the products in a chemical reaction is 60 kilocalories. This reaction would be exothermic if the potential energy of the reactants were
A
50 kcal
B
20 kcal
C
30 kcal
D
80 kcal
8) In which system will there be a decrease in entropy as bromine undergoes a change in phase?
A
Br2(s) → Br2(g)
B
Br2(l) → Br2(g)
C
Br2(s) → Br2(l)
D
Br2(g) → Br2(l)
9) Given the reaction at equilibrium: N2(g) + 3H2(g) <--> 2NH3(g) if the pressure is increased at constant temp. there will be an increase in:
A
H2(g), only
B
N2(g), only
C
both N2(g) and H2(g)
D
NH3(g), only
10) When an exothermic reaction occurs in a water solution, the temperature of the solution
A
decreases because energy is given off by the reaction
B
decreases because energy is absorbed by the reaction
C
increases because energy is absorbed by the reaction
D
increases because energy is given off by the reaction
*select an answer for all questions
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