Plan an investigation to find the order of reactivity of three metals - AQA - GCSE Chemistry Combined Science - Question 3 - 2022 - Paper 1
Question 3
Plan an investigation to find the order of reactivity of three metals.
You should use the temperature change when each metal reacts with hydrochloric acid.
Worked Solution & Example Answer:Plan an investigation to find the order of reactivity of three metals - AQA - GCSE Chemistry Combined Science - Question 3 - 2022 - Paper 1
Step 1
Measure volume of (hydrochloric) acid
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Answer
Begin by measuring a specific volume of hydrochloric acid using a graduated cylinder. Pour this acid into a suitable container such as a polystyrene cup, which will help to minimize heat loss.
Step 2
Measure the initial temperature
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Answer
Using a thermometer, measure the initial temperature of the hydrochloric acid before adding any metal.
Step 3
Add the first metal sample
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Select a metal to test (e.g., zinc, magnesium), and add a measured mass of this metal into the hydrochloric acid. Stir the solution gently to ensure thorough mixing.
Step 4
Record temperature change
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Measure the highest temperature reached after adding the metal, or alternatively measure the temperature at specific time intervals to determine the temperature change.
Step 5
Repeat with other metals
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Repeat the same procedure for the other two metal samples, ensuring that each metal is of the same mass and in a similar physical state (e.g., powder, lump). Maintain the same volume and concentration of hydrochloric acid for fair testing.
Step 6
Analyze results
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Answer
Use the temperature changes recorded to arrange the metals in order of reactivity. The metal that causes the largest temperature increase is the most reactive.
