Reactions of metals with dilute acids

2 marks · Normal

State two variables, apart from the type of metal, that must be controlled in an experiment comparing how quickly different metals react with dilute acid.

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Also accept: Concentration of acid; amount (volume) of acid; number of moles (amount) of metal; surface area of metal; temperature of acid.

Common mistakes: Repeating 'type of metal' or listing unconnected variables.

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Marking points

B1 · 1 mark · Names a suitable control variable, e.g. acid concentration, acid volume, number of moles of metal, surface area, or temperature of acid.

B2 · 1 mark · Names a second suitable control variable (different from the first).

Worked solution

Examples: Volume of acid, concentration of acid, number of moles of metal, surface area of metal, or initial temperature of the acid must be controlled for a fair test.