A student investigates the temperature changes when different metal powders are added to copper sulfate solution. Some metals displace copper from the solution.
Complete the word equation for the reaction of zinc with copper sulfate solution.
zinc + copper sulfate →\rightarrow→ ........ + ........
The table shows the student's results.
| Metal | Temperature rise in trial 1 / °C | Temperature rise in trial 2 / °C | Mean temperature rise / °C |
|---|---|---|---|
| magnesium | 38.5 | 39.5 | 39.0 |
| zinc | 12.0 | 13.0 | |
| iron | 7.5 | 6.5 | 7.0 |
| silver | 0.0 | 0.0 | 0.0 |
Calculate the mean temperature rise for zinc.
The order of reactivity of these metals is magnesium > zinc > iron > copper > silver.
Describe the relationship between the reactivity of the metal and the temperature rise.
Explain why there is no temperature change when silver is added.
Devise a method the student could use to obtain the results in the table. Your method should make the investigation a fair test.
53 exam-style questions on Edexcel GCSE Chemistry 8.2 Heat energy changes in chemical reactions, covering 8.2.1 Exothermic and endothermic changes, 8.2.2 Bond breaking, bond making and overall energy change, 8.2.3 Calculating energy change from bond energies, and 8.2.4 Activation energy and reaction profiles. Each one has a worked solution and a mark scheme showing where the marks go.