A recycling plant is testing a process to recover a metal, M, from waste metal oxide dust.
In a test, a sample of M did not react with dilute hydrochloric acid.
The oxide of M is heated with carbon until the reaction is complete. Carbon dioxide is the only other product.
| Mass of oxide of M heated | Mass of M produced |
|---|---|
| 25.0 g | 20.0 g |
Calculate the mass of oxygen in the 25.0 g sample of the oxide of M.
Explain why carbon can be used to extract M from its oxide and why the reaction is a redox reaction.
86 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. Each one has a worked solution and a mark scheme showing where the marks go.