Chemistry Multiple Choice

1 In which direction will the point of equilibrium shift when a catalyst is added to the following equilibrium system?

KNO3 + 34.7 kJ K+1 (aq) + NO3-1 (aq)

a.Shift to the right
b.Shift to the left
c.No shift

2.The magnitude of Keq depends on
a.Initial concentration of reactants
b.Presence of a catalyst
c.Temperature
d.Volume of reaction vessel

3.In which direction will the point of equilibrium shift when the pressure is decreased in the following equilibrium?

H2 (g) + Cl2 (g) 2 HCl (g)
a.Shift to the right
b.Shift to the left
c.No shift

4.The equilibrium constant can change significantly with a change in
a.Concentration
b.Catalyst
c.Temperature
d.Pressure

5.In the following equilibrium, when sodium ion is removed, the concentration of chloride ion will
Na+1 (aq) + Cl-1 (aq) NaCl (s)

a.Increase
b.Decrease
c.Remain the same
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1. In which direction will the point of equilibrium shift when a catalyst is added to the following equilibrium system?

KNO3 + 34.7 kJ ---> K+ (aq) + NO3- (aq)

c.No shift

Catalyst won't affect equilibrium and the rates, as it only speeds up the reaction by decreasing the activiation energy.

2.The magnitude of Keq depends on

c.Temperature

Fact.

3.In which direction will the point of equilibrium shift when the pressure is decreased in the following equilibrium?

H2 (g) + Cl2 (g) ---> 2 HCl (g)

c.No shift

When pressure is decreased, equilibrium shifts to the greatest number of moles; there are equal number of moles on both sides.


4.The equilibrium constant can change significantly with a change in

c.Temperature

Only temperature effects rate constant.


5.In the following equilibrium, when sodium ion is removed, the concentration of chloride ion will
Na+ (aq) + Cl- (aq)---> NaCl (s)

a.Increase

If Na+ is taken out, equilibrium will shift to the left to increase [Cl-].