An investigator analyzed the relative reactivity of different metals by measuring the temperature increase when equal masses of each metal were added to a fixed volume of copper(II) sulfate solution.
The student's recorded data is shown in the table below:
| Metal | Temperature rise in ∘C^\circ\text{C}∘C (Trial 1) | Temperature rise in ∘C^\circ\text{C}∘C (Trial 2) | Temperature rise in ∘C^\circ\text{C}∘C (Trial 3) | Temperature rise in ∘C^\circ\text{C}∘C (Trial 4) | Temperature rise in ∘C^\circ\text{C}∘C (Trial 5) | Mean temperature rise in ∘C^\circ\text{C}∘C |
|---|---|---|---|---|---|---|
| Tin | 2.1 | 1.9 | 2.4 | 1.8 | 1.8 | 2.0 |
| Zinc | 14.2 | 13.8 | 14.5 | 13.9 | 13.6 | 14.0 |
| Magnesium | 24.5 | 25.1 | 8.2 | 24.8 | 25.6 | XXX |
Calculate the mean temperature rise X X\,X for magnesium in the table.
Do not include the anomalous result in your calculation.
5 exam-style questions on AQA GCSE Chemistry 4.1 Reactivity of metals, covering 4.1.1 Metal oxides, 4.1.2 The reactivity series, 4.1.3 Extraction of metals and reduction, and 4.1.4 Oxidation and reduction in terms of electrons (HT only). Each one has a worked solution and a mark scheme showing where the marks go.