Lesson T4.1.1

T4.1.1 Rearranging atoms in reactions Quiz: KS3 Chemistry, Unit 4

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T4.1.1, Rearranging atoms in reactions: 20 multiple choice questions for the KS3 Chemistry (National Curriculum), Unit 4: Chemical reactions, written with Revision Ninja.

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The 20 questions

  1. What happens to atoms during a chemical reaction?

    • They are destroyed
    • They shrink
    • They multiply
    • They are rearranged

  2. What do the reactants become in a chemical reaction?

    • Catalysts
    • Products
    • Solvents
    • Solutes

  3. How do total atom numbers compare before and after a reaction?

    • They become random
    • They always increase
    • They remain equal
    • They always decrease

  4. Which substance is a reactant in the burning of methane?

    • Carbon dioxide
    • Water
    • Heat
    • Methane

  5. Why do new substances form during a chemical reaction?

    • Atoms shrink
    • Atoms multiply
    • Atoms rearrange
    • Atoms are destroyed

  6. What happens to hydrogen atoms during a chemical reaction?

    • They rearrange
    • They vanish
    • They melt
    • They duplicate

  7. What forms when iron reacts with oxygen?

    • Iron oxide
    • Iron chloride
    • Iron sulphate
    • Iron hydroxide

  8. How do hydrogen and oxygen form water molecules?

    • Atoms split
    • Atoms dissolve
    • Atoms vanish
    • Atoms rearrange

  9. What is the key sign of a chemical reaction?

    • Temperature rises
    • Volume decreases
    • New substance forms
    • Colour fades

  10. What does a reaction diagram of atoms show?

    • Atoms rearrange
    • Atoms multiply
    • Atoms vanish
    • Atoms grow

  11. Which process is a chemical reaction?

    • Dissolving salt
    • Boiling water
    • Melting ice
    • Burning magnesium

  12. In a reaction, what is the name for the substances on the left-hand side of the arrow?

    • Products
    • Solutes
    • Catalysts
    • Reactants

  13. What happens to atoms when copper oxide reacts with hydrogen?

    • Atoms contract
    • Atoms rearrange
    • Atoms vanish
    • Atoms expand

  14. How do atom numbers compare on both sides of a balanced equation?

    • They are equal
    • They are random
    • They are fewer
    • They are double

  15. Where do carbon atoms from methane go in combustion?

    • Into carbon dioxide
    • Into hydrogen
    • Into oxygen
    • Into water

  16. Why are atoms conserved in chemical reactions?

    • They have fixed mass
    • They are never destroyed
    • They bind to energy
    • They dissolve in liquids

  17. Which false statement is often made about chemical reactions?

    • Mass is conserved
    • New substances form
    • Atoms are rearranged
    • Atom numbers increase

  18. What information does a word equation provide?

    • Reactants and products
    • Exact atom counts
    • Reaction temperatures
    • Molecule speeds

  19. What happens when sodium reacts with chlorine?

    • Atoms turn green
    • Atoms bond differently
    • Atoms are destroyed
    • Atoms shrink completely

  20. Which of these is the gas product when zinc reacts with hydrochloric acid and bubbles form?

    • Hydrogen
    • Oxygen
    • Carbon dioxide
    • Chlorine

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