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
Start by measuring a specific volume of hydrochloric acid using a graduated cylinder. Pour the acid into a suitable container, such as a polystyrene cup, to minimize heat loss.
Step 2
Measure initial temperature
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Use a thermometer to measure the initial temperature of the hydrochloric acid in the container. Record this value to establish a baseline.
Step 3
Add metal sample
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Take a sample of the first metal you want to test. Ensure that the metal has a consistent surface area, such as using a powder or lump, and add it to the acid in the container. Stir the solution gently.
Step 4
Record highest temperature
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After adding the metal, monitor the solution for temperature changes. Measure the highest temperature reached during the reaction and record this value.
Step 5
Repeat for other metals
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Repeat the process for the other two metals, ensuring each test uses the same mass and form (powder or lump) of metal and the same volume and concentration of hydrochloric acid.
Step 6
Analyze results
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Answer
Compare the maximum temperatures achieved during each reaction. The metal that produces the highest temperature change is the most reactive, indicating the order of reactivity among the metals tested.
