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Kinetics/Equilibrium Review
Test Description: Kinetics/Equilibrium Review
Instructions: Answer all questions to get your test result.
1) 2C(s) + H2(g) + 227.4 kJ <--> C2H2(g). If 682.2 kJ are absorbed, for how many moles of C2H2(g) are produced?
A
3
B
6
C
4
D
2
2) A student observed that the temperature of water increased when a salt was dissolved in it. The student should conclude that dissolving the salt caused
A
an endothermic reaction
B
formation of an acidic colution
C
an exothermic reaction
D
formation of a basic solution
3) Which change represents an increase in entropy?
A
H2O(l) --> H2O(s)
B
H2O(g) --> H2O(l)
C
Br2(s) --> Br2(g)
D
Br2(g) --> Br2(l)
4) N2(g) + 3H2(g) <--> 2NH3(g) + 92 kJ. A larger yield of NH3 is obtained when
A
temperature and pressure are increased
B
temperature is decreased and pressure is increased
C
temperature is icreased and pressure is decreased
D
temperature and pressure are decreased
5) The delta H of a chemical reaction refers to the change in
A
phase
B
potential energy
C
activation energy
D
entropy
6) H2(g) + I2(g) + heat <--> 2HI(g). What is the result of an increase in temperature
A
The equilibrium shifts to the right and concentration of HI decreases
B
The equilibrium shifts to the left and concentration of H2 increases
C
The equilibrium shifts to the left and concentration of H2 decreases
D
The equilibrium shifts to the right and concentration of HI increases
7) Which equilibrium system at constant temperature shifts to the right when pressure is increased
A
2SO3(g) <--> 2SO2(g) + O2(g)
B
2H2(g) + O2(g) <--> 2H2O(g)
C
2NO(g) <--> N2(g) + O2(g)
D
2CO2(g) <--> 2CO(g) + O2(g)
8) A(g) + B(g) <--> C(g) + D(g). At constant temperature and pressure, an increase in the concentration of A(g) causes
A
a decrease in the concentration of D(g)
B
an increase in the concentration of B(g)
C
a decrease in the concentration of C(g)
D
a decrease in the concentration of B(g)
9) Which phrase best describes the following reaction...2H2O(l) + heat <--> 2H2(g) + O2(g)
A
exothermic, releasing energy
B
endothermic, absorbing energy
C
endothermic, releasing energy
D
exothermic, absorbing energy
10) In most aqueous reactions as temperature increases, the effectiveness of collisions between reacting particles
A
increases
B
remains the same
C
decreases
*select an answer for all questions
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