A technician compares three metal powders. Equal masses of magnesium, metal X and zinc are added separately to equal volumes of the same dilute hydrochloric acid. The time until fizzing stops is recorded.
| Metal | Time until fizzing stops |
|---|---|
| Magnesium | 18 s |
| Metal X | 31 s |
| Zinc | 74 s |
Describe a test to identify the gas given off when metal X reacts with the acid. Give the result of the test.
Explain how the results show that metal X is more reactive than zinc but less reactive than magnesium.
The technician adds copper powder to the same dilute hydrochloric acid.
Predict whether a gas is produced. Give a reason for your answer.
88 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.