Self assessment
Question 1 of 5
Consider the equilibrium:
PCl5(g) PCl3(g) + Cl2(g), ΔH = +124 kJ mol–1
Which of the following is true when the temperature of the reaction is increased?
A
The concentration of PCl5(g) increases.
B
The concentration of PCl3(g) increases.
C
The concentration of chlorine increases.
D
K c increases.
Consider the equilibrium:
2SO2(g) + O2(g) 2SO3(g), ΔH = –197 kJ mol–1
Which of the following increases if the reaction is heated?
A
The concentration of SO2(g).
B
The concentration of O2(g).
C
The concentration of SO3(g).
D
The value of Kp.
In an equilibrium for which the forward reaction is exothermic, which of the following is a consequence of heating the reaction?
A
The rate of the forward reaction increases.
B
The rate of the back reaction increases.
C
The rate of the back reaction stays the same.
D
The rate of the back reaction slows down.
Consider the equilibrium:
2HI(g) H2(g) + I2(g)
Which of the following result in a change in the value of Kc?
A
Adding a catalyst.
B
Heating the reaction.
C
Cooling the reaction.
D
Increasing the pressure.
Consider the equilibrium:
CO2(g) + 2H2(g) CH3OH(g), ΔH = –92 kJ mol–1
Which of the following is a consequence of adding a catalyst to the reaction mixture?
A
K p increases.
B
The equilibrium establishes faster.
C
The rate of the forward reaction increases.
D
The rate of the back reaction increases.