Chemistry Unit C1 Worksheet - Study And Revision Pack (Foundation Paper) Page 9
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34C1.2 Exam Questions – 26 marks, 26 minutes
Q1.
A student investigated the effect of heat on four metal carbonates.
Equal amounts of each carbonate were heated strongly, in the same way, in this apparatus.
The time it took for the limewater to turn milky was measured.
The table shows the student's results.
(a) At the end of each experiment, the delivery tube was removed from the limewater before
removing the heat from the tube.
Explain why it was important not to remove the heat from the test tube while the delivery tube
was still in the limewater.
(2)
..............................................................................................................................................
..............................................................................................................................................
(b) Suggest why the limewater did not turn milky when sodium carbonate was heated.
(1)
(c) Complete the sentence by putting a cross (
) in the box next to your answer.
The reaction that takes place when copper carbonate is heated is an example of
(1)
A neutralisation
B oxidation
C thermal decomposition
D dissolving
(d) Write the word equation for the reaction that takes place when copper carbonate is heated.
(2)
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