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
Start by weighing the empty test tube and recording its mass. This is important for determining the mass of the metal carbonate after addition.
Step 2
Add metal carbonate
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Add a known mass of copper carbonate (or any metal carbonate being tested) to the weighed test tube.
Step 3
Heat
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Heat the test tube containing copper carbonate. Allow it to heat for an appropriate period, ensuring you're observing the entire reaction.
Step 4
Allow to cool
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After heating, remove the test tube from the heat source and allow it to cool before proceeding to the next step.
Step 5
Weigh test tube and metal oxide
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Once cooled, weigh the test tube again with the remaining metal oxide and record the mass.
Step 6
Determine mass of carbon dioxide produced
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Calculate the mass of carbon dioxide produced by subtracting the mass of the test tube plus metal oxide from the initial mass (test tube + metal carbonate). Use this information to compare carbon dioxide generation across different metal carbonates.
Step 7
Repeat with different metal carbonates
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To thoroughly test the hypothesis, repeat the entire process with different metal carbonates, ensuring that results are consistently observed and recorded.
Step 8
Analyze results
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Analyze the data collected to assess whether the hypothesis holds true, comparing the mass loss of each metal carbonate to determine the consistency in carbon dioxide production.
