(a(i))[1]
Explain why the rate of reaction decreases as the reaction progresses.
(a(ii))[1]
Explain why the rate of reaction eventually becomes zero.
(b)[2]
Explain, in terms of collision theory, why the rate of reaction increases if powdered zinc is used.
(c)[3]
Calculate the volume of $\text{H}_2$ formed at r.t.p. using the steps given.
(d(i))[2]
Write a symbol equation for this reaction.
(d(ii))[1]
State the test for hydrogen gas and the positive result.