(a)[1]
Deduce how long it takes, from the start of the experiment, for the mass of the reaction mixture to fall by 1.0 g.
(b)[2]
Draw a line on the grid to illustrate how the mass of the reaction mixture varies with time when acid of a greater concentration is used.
(c)[2]
Describe what effect each of the following has on the rate of reaction between calcium carbonate and hydrochloric acid: • The reaction is carried out at a higher temperature. • The reaction is carried out using large pieces of calcium carbonate instead of small pieces of calcium carbonate.
(d)[1]
Calculate the mass of calcium carbonate needed so that $25\text{ cm}^3$ of carbon dioxide gas is produced.
(e)[2]
Arrange the four metals in order of reactivity, with the least reactive metal first.