Chemistry 0620 · IGCSE · Rate of reaction

Rate of reaction — practice question

When large chunks of solid sulfur burn in an excess of oxygen, sulfur dioxide gas is formed.
(a)[1]

Complete the equation by filling in the missing state symbol. $\text{S}$(....) $+ \text{O}_2$(g) $\rightarrow \text{SO}_2$(g)

(b)[1]

Deduce how long the reaction takes to finish.

(c)[1]

Describe how the rate of reaction is affected when powdered sulfur is used instead of large pieces of sulfur.

(d(i))[2]

Describe the effect, if any, of each change below on the rate of this reaction. Keep all other conditions unchanged. The temperature is decreased. The pressure of the gases is increased.

(d(ii))[1]

Select the correct concentration unit from the list. $\text{dm}^3/\text{mol}$ $\text{mol}/\text{dm}$ $\text{mol}/\text{dm}^2$ $\text{mol}/\text{dm}^3$

(e(i))[1]

State one harmful effect of sulfur dioxide.

(e(ii))[1]

State one additional method of reducing sulfur dioxide emissions from fossil fuels.

(f)[3]

Explain these results using kinetic particle theory.

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