This question is about oxidation and reduction.
A sparkler contains magnesium powder. When the sparkler is lit, the magnesium reacts with oxygen in the air.
Complete the word equation for this reaction.
magnesium + oxygen → ......
Is the magnesium oxidised or reduced in this reaction?
Give a reason for your answer.
Copper can be made by heating copper oxide with carbon.
copper oxide + carbon → copper + carbon dioxide
Name the substance that is reduced in this reaction.
Name the substance that is oxidised in this reaction.
The table shows three more changes.
| Change | Is the first substance oxidised or reduced? |
|---|---|
| iron turns into iron oxide when it rusts | ? |
| lead oxide turns into lead when it is heated with carbon | ? |
| sulfur burns in air to make sulfur dioxide | ? |
Complete the table. Write oxidised or reduced in each row.
53 exam-style questions on OCR GCSE Chemistry 3.3 Types of chemical reactions, covering 3.3.1 Oxidation and reduction in terms of oxygen, 3.3.2 Acids, alkalis and neutralisation, 3.3.3 The pH scale and measuring pH, 3.3.4 Oxidation and reduction in terms of electrons, 3.3.5 Dilute and concentrated, weak and strong acids, and 3.3.6 Hydrogen ion concentration and pH. Each one has a worked solution and a mark scheme showing where the marks go.