CSEC Chemistry · January 2013 · Paper 2 · Question 1(a)

Derrick performed four experiments to investigate factors affecting the rate of hydrogen gas production from zinc metal and dilute hydrochloric acid. Experiment 1 used granulated zinc, 0.1 mol dm⁻³ HCl at 30 °C, measuring hydrogen volume after 2 minutes. Subsequent experiments varied acid concentration (Exp 2), zinc form (Exp 3), and temperature (Exp 4). Gas volumes were collected over 2 minutes and are summarized in Table 1 and Figure 1.

Define the term 'rate of reaction'.

This question uses a figure or table from the paper — you'll see it when you practise.