Some students investigated the thermal decomposition of metal carbonates - AQA - GCSE Chemistry Combined Science - Question 3 - 2020 - Paper 1
Question 3
Some students investigated the thermal decomposition of metal carbonates.
The word equation for the reaction is:
metal carbonate → metal oxide + carbon dioxide.
T... show full transcript
Worked Solution & Example Answer:Some students investigated the thermal decomposition of metal carbonates - AQA - GCSE Chemistry Combined Science - Question 3 - 2020 - Paper 1
Step 1
Weigh test tube
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Answer
Begin the experiment by weighing the empty test tube accurately and record the mass.
Step 2
Add metal carbonate
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Answer
Add a known mass of copper carbonate to the test tube, ensuring it is fully intact and no spillage occurs.
Step 3
Heat
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Answer
Heat the test tube containing copper carbonate with a Bunsen burner for a fixed period, as outlined in the table.
Step 4
Allow to cool
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After heating, allow the test tube and its contents to cool to room temperature.
Step 5
Weigh test tube and metal oxide
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Answer
Reweigh the test tube along with the remaining contents (metal oxide) and record the new mass.
Step 6
Determine mass of carbon dioxide produced
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Calculate the change in mass by subtracting the final mass (after heating) from the initial mass (before heating). This change in mass represents the mass of carbon dioxide released during the decomposition of copper carbonate.
Step 7
Repeat with different metal carbonates
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To validate the hypothesis, repeat the procedure using different metal carbonates, ensuring to measure and record the mass changes for each to compare the results.
