Question

True or False

1.For the following reaction at equilibrium:
                       CaCO₃(s) ⇌ CaO(s) + CO₂(g)
                       increasing the total pressure by adding Ar(g) will shift the equilibrium to the left.

2.For the following reaction at equilibrium:
                       H₂(g) + F₂(g) ⇌ 2HF(g)
                       removing H₂ will increase the amount of F₂ present once equilibrium is reestablished.

3.Increasing the temperature of an exothermic reaction shifts the equilibrium position to the right.

4.For the following reaction at equilibrium:
                       CaCO₃(s) ⇌ CaO(s) + CO₂(g)
                       adding more CaCO₃ will shift the equilibrium to the left.

5. For the following reaction at equilibrium:
                       2 H₂(g) + O₂(g)⇌ 2 H₂O(g)
                       the equilibrium will shift to the left if the volume is halved.

Answer 1

1) given

CaC03 (s) ---> CaO (s) + C02 (g)

we know that

the total pressure does not have any effect on the equilibrium constant

so

there is no shift in the equilibrium

so

the given statement is false

2)

given reaction is

H2 + F2 --> 2HF

Changing the concentration of a chemical will shift the equilibrium to the side that would reduce that change in concentration

so

as H2 is removed

the equilibrium will shift to reduce the change

that is

the equilibrium will shift to produce more H2

that is

the equilibrium will shift to the left side

as a result

more F2 will be formed

so

the given statement is true

3) the exothermic reaction is

reactants ---> products + heat

increase in temperature means adding heat

so

to reduce the change

less heat will be produced

that is

the equilibrium will shift to the left

so

the given statement is false

4)

CaC03 (S) ---> CaO (s) + C02 (g)

solids have no effect on equilibrium

so

the given statemnt is false

5)

2H2 + 02 ---> 2 H20

we know that

When there is an increase in volume, the equilibrium will shift to favor the direction that produces more moles of gas

so in this case

the equilibrium will shift to the left

so

the given statement is true

so

the answers are

1) false

2) true

3) false

4) false

5) true