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Ib Chemistry Questions

In: Science

Submitted By anapaulina97
Words 2417
Pages 10
1. The equilibrium between nitrogen dioxide, NO2, and dinitrogen tetroxide, N2O4, is shown below.

2NO2(g) [pic] N2O4(g) Kc = 0.01

What happens when the volume of a mixture at equilibrium is decreased at a constant temperature?

I. The value of Kc increases

II. More N2O4 is formed

III. The ratio of [pic] decreases

A. I and II only

B. I and III only

C. II and III only

D. I, II and III
(Total 1 mark)

2. Which statement about chemical equilibria implies they are dynamic?

A. The position of equilibrium constantly changes.

B. The rates of forward and backward reactions change.

C. The reactants and products continue to react.

D. The concentrations of the reactants and products continue to change.
(Total 1 mark)

3. Methanol may be produced by the exothermic reaction of carbon monoxide gas and hydrogen gas.

CO(g) + 2H2(g) [pic] CH3OH(g) ∆HO = –103 kJ

(a) State the equilibrium constant expression, Kc, for the production of methanol.

......................................................................................................................................

......................................................................................................................................
(1)

(b) State and explain the effect of changing the following conditions on the amount of methanol present at equilibrium:

(i) increasing the temperature of the reaction at constant pressure.

...........................................................................................................................

...........................................................................................................................

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