Grade 9 · CAPS
Grade 9 Reaction of metals with oxygen
Natural Sciences and Technology practice questions with answers
Grade 9 Reaction of Metals with Oxygen is part of the CAPS Natural Sciences and Technology curriculum, covering what happens when metals such as iron and magnesium react with oxygen to form metal oxides. Learners practise naming the products of these reactions, writing and balancing the equations involved, and classifying substances as metals based on how they behave in a reaction.
The practice questions below are drawn from ReClass's own question bank, based on real Grade 9 CAPS assessments, giving learners a chance to work through metal-oxide reaction questions in the same style they will meet in a test.
Worked example
Give the names of the two reactants that combine in the chemical reaction that forms rust.
Answer & explanation
Iron and oxygen
You'll also practise
- 5.1 A group of learners set up an experiment to investigate the reaction of oxygen with metals, as shown in the figure below. Complete the table using your knowledge.
- 5.4 Study the following pictures, A – D, and illustrate which technique is applied to prevent rust.
- A piece of metal burns with a blinding white flame in oxygen to form a white metal oxide. Which balanced equation represents this reaction?
- What is the chemical name of the product formed when iron reacts with oxygen in the presence of moisture?
- What term describes a compound formed when a metal reacts with oxygen?
- Magnesium is heated and burnt in air. Classify magnesium as a metal or a non-metal.
- What colour flame does magnesium burn with in air?
- Iron reacts with oxygen in the presence of moisture to form a reddish-brown powder on its surface. Write the balanced chemical equation for this reaction.
- Complete the word equation for the reaction between iron and oxygen: Iron + Oxygen → ?
- Rust is a form of iron oxide formed when iron reacts with oxygen. Write the balanced chemical equation for this reaction.
- Give the correct term: a product of a chemical reaction between a metal and oxygen.
Common mistakes
- Forgetting to balance the equation once the metal oxide formula is written.
- Confusing the reaction of a metal with oxygen with the separate process of rusting.
- Not recognising a metal oxide as the product simply because the compound name is unfamiliar.
Aligned to CAPS Grade 9 Natural Sciences and Technology — Reaction of metals with oxygen.
Check your own understanding
Start a personalised Grade 9 Reaction of metals with oxygen practice session on ReClass.