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Q1.
The student’s results are shown in the table.
Describe and explain the trends shown in the student’s results.
(6)
As the concentration of copper sulfate increases, the temperature change also increases. This is because more particles are reacting, so more heat is released. This shows the reaction is exothermic.
After experiment 7, the temperature doesn’t increase anymore – it levels off. This is because the reaction has finished or all of the other reactant is used up, so no extra heat is produced.
There is an anomalous result in experiment 3 – the temperature change there doesn’t follow the pattern.
Overall, the temperature change increases at first, then stays the same after experiment 7, which means copper sulfate is in excess and adding more doesn’t make a difference.
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