6.1.2 — Physical & Chemical Changes
Cambridge IGCSE Chemistry (0620) · 15 Questions · 38 Marks · Reveal answers to self-mark
State two differences between a physical change and a chemical change.
Define the term 'physical change' and give one example.
Define the term 'chemical change' and give one example.
State two observations that suggest a chemical change has occurred during a reaction.
State what is meant by the term 'reversible change' and explain why melting is considered reversible.
Is dissolving copper(II) sulfate crystals in water a physical or chemical change? Justify your answer.
Is neutralising hydrochloric acid with sodium hydroxide solution a physical or chemical change? Justify your answer.
Classify each of the following as either a physical or chemical change: (a) Boiling water (b) Burning wood (c) Dissolving sugar in tea (d) Rusting of iron (e) Cutting paper
A student heats copper(II) carbonate. A gas is produced and a black solid remains. Is this a physical or chemical change? Give two reasons.
A student mixes iron filings and sulfur powder. The mixture is then strongly heated and a grey-black solid is formed. (a) Is the initial mixing a physical or chemical change? (b) Is the heating a physical or chemical change?
Explain why the sublimation of iodine is classified as a physical change.
Explain, in terms of particles and bonds, why burning methane in oxygen is a chemical change.
A student says: 'Dissolving salt in water is a chemical change because the salt disappears.' Evaluate this statement. Is the student correct?
Explain why the electrolysis of water is classified as a chemical change, whereas freezing water is a physical change.
A firework explodes producing coloured light, loud sound, and smoke. (a) Explain why this is a chemical change. (b) Name two pieces of evidence from the observations that support your answer.
📊 Your Score Tracker
- → Always state "no new substance is formed" for PHYSICAL changes (not just "reversible")
- → Always NAME the new substance for CHEMICAL changes (e.g. "iron(II) sulfide" not just "a solid")
- → Colour change ALONE does NOT prove a chemical change — dissolved Cu²⁺ is still blue but still physical
- → "Energy released" applies to BOTH types — never use it as your sole justification
- → Include state symbols in all equations: (s), (l), (g), (aq)
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