Which of the following is a CHEMICAL change?
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Practise IGCSE 0620 questions in the style of recent Extended past papers, organised by syllabus subtopic. Each set comes with an examiner-style mark scheme and a downloadable worksheet.
Everything students ask about Cambridge IGCSE 0620 Physical and chemical changes Topical Past Papers.
Top questions students ask on this sub-topic
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These Physical and chemical changes Topical Past Paper Questions are written in the style of recent Cambridge IGCSE Chemistry 0620 Extended papers and grouped by the Chemical reactions (C6.1) section of the 2025–2027 syllabus. Use them to revise the exact skills examiners test in this part of the course.
Each question is graded Easy → Medium → Hard, plus an A★ Challenge for top-grade preparation. Tap a question to mark your own answer, then unlock the examiner-style mark scheme with model solutions and examiner tips. A printable Topical Past Papers worksheet is included so you can practise offline.
Distinguish between physical and chemical changes using observable evidence (e.g. colour change, gas evolution, temperature change, formation of a precipitate, irreversibility).
Which of the following is a CHEMICAL change?
State TWO general differences between a physical change and a chemical change.
Give ONE difference relating to new substances.
[1 mark]Give ONE difference relating to reversibility.
[1 mark]Which of the following observations would be the BEST single piece of evidence that a chemical reaction has occurred?
A student mixes blue copper(II) sulfate solution with sodium hydroxide solution. A blue jelly-like precipitate forms.
State whether this is a physical or chemical change, and give TWO pieces of evidence from the observations.
[2 marks]Write a balanced ionic equation for the formation of the blue precipitate.
[1 mark]Which of the following processes is BOTH a chemical change AND a reversible reaction?
A student carries out three experiments and records the following observations: Experiment 1: Sodium reacts vigorously with water; bubbles of gas appear; the mixture becomes hot; sodium disappears. Experiment 2: Salt is added to water; the salt disappears; the mixture is colourless; the temperature falls only slightly. Experiment 3: Heating a small amount of green copper(II) carbonate in a test tube; the green colour turns black; a gas is released that turns limewater milky.
For each experiment, state whether it is a physical or chemical change.
[2 marks]For Experiment 1, give TWO specific pieces of evidence from the observations that show a chemical change has occurred.
[2 marks]A student claims that 'a colour change always means a chemical change'. Discuss whether this statement is true, giving examples.
Give an example of a colour change that DOES indicate a chemical change, with a brief reason.
[1 mark]Give an example of a colour change that does NOT indicate a chemical change, and explain.
[2 marks]Which of the following is a CHEMICAL change?