Essay about Ib Chemistry Questions

2418 Words Dec 27th, 2015 10 Pages
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
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(ii) increasing the pressure of the reaction at constant temperature.

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(c) The conditions used in industry during the production of methanol are a temperature of 450 °C and pressure of up to 220 atm. Explain why these conditions are used rather than those that could give an even greater amount of methanol.

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