A student added the same mass of three different metals to three test tubes. Each test tube contained 20 cm3 of dilute hydrochloric acid of the same concentration. The student measured the time taken to collect 20 cm3 of gas.
Table: The time taken to collect 20 cm3 of gas when three different metals react with dilute hydrochloric acid of the same concentration
| Metal | Time taken to collect 20 cm3 of gas in s |
|---|---|
| Magnesium | 25 |
| Zinc | 140 |
| Copper | no gas was collected |
Name the gas collected in the reactions of magnesium and of zinc.
Name the salt formed in the test tube containing zinc.
Explain why no gas was collected in the test tube containing copper.
The student concluded that magnesium is more reactive than zinc. Use the data in Table to support this conclusion.
40 exam-style questions on AQA GCSE Chemistry 4.2 Reactions of acids, covering 4.2.1a Reactions of acids with metals, 4.2.1b Redox in acid-metal reactions, 4.2.2 Neutralisation of acids and salt production, 4.2.3 Soluble salts, 4.2.4 The pH scale and neutralisation, 4.2.5a Titrations, 4.2.5b Calculating quantities in titrations, and 4.2.6 Strong and weak acids. Each one has a worked solution and a mark scheme showing where the marks go.