Cambridge IGCSE · 0620 · Paper 1 · Multiple choice (Core)
Chemistry 0620/13 Oct/Nov 2025 past paper
Cambridge IGCSE Chemistry (0620) Paper 1 (Multiple choice (Core)), variant 3, Oct/Nov 2025: the question paper and its official mark scheme, 40 questions worth 40 marks, with the grade thresholds. Free to open, no account needed.
- Questions
- 40
- Marks
- 40
- Grade A from
- 23
File names: 0620_w25_qp_13 · 0620_w25_ms_13
Grade thresholds for 0620/13 Oct/Nov 2025
The minimum raw marks Cambridge set for each grade on this component (out of 40). Thresholds change every session and variant, so always compare your score with the paper you actually sat.
| A | B | C | D | E |
|---|---|---|---|---|
| 23 | 20 | 17 | 15 | 13 |
Topics in this paper
Which syllabus chapters 0620/13 Oct/Nov 2025 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/13 Oct/Nov 2025
- Question 1
Substances exist as solids, liquids or gases. In which states of matter are the particles a similar distance apart? A solid, liquid and gas B solid and liquid only C solid and gas only D liquid and gas only
- Question 2
A container with a fixed shape is filled with gas and then sealed. The container is then heated. Which changes take place? 1 The volume of gas decreases. 2 The gas molecules move faster. 3 The pressure inside the cylinder …
- Question 3
A crystal of sodium chloride is dropped into a beaker of water. Over time, the sodium chloride particles become evenly distributed throughout the water. Which processes occur in this experiment? A both dissolving and diffusion B dissolving only C diffusion …
- Question 4
The electronic structures of two atoms, P and Q, are shown. …
- Question 5
The electronic configuration of an ion is 2,8,8. What could this ion be? S2– Ca2+ …
- Question 6
The table shows the nucleon number and the number of neutrons in one atom of isotopes …
- Question 7
Which statement about an ionic bond is correct? A It is a strong electrostatic attraction between cations and anions. B It is a strong electrostatic attraction between protons and electrons. C It is a weak electrostatic attraction between cations and …
- Question 8
Which row describes simple molecular compounds? melting point electrical conductivity when molten A high good B high poor C low good D low poor
- Question 9
Boron nitride is a compound of the elements boron and nitrogen. It has a similar structure to diamond. What is likely to be a property of boron nitride? A It conducts electricity. B It is soluble in water. C It …
- Question 10
Which statement defines the term molecular formula? A a formula that shows the total number of atoms in a molecule B a formula that shows the total number of elements in a molecule C a formula that shows the arrangement …
- Question 11
What is the relative formula mass, Mr, of calcium hydroxide, Ca(OH)2? …
- Question 12
Which statements explain why metal objects are electroplated? 1 Electroplating improves the appearance of the object. 2 Electroplating insulates the metal object. 3 Electroplating makes the metal object more resistant to corrosion. 4 Electroplating makes the metal object softer. A …
- Question 13
Three statements about a hydrogen–oxygen fuel cell are listed. 1 The overall equation for the reaction is …
- Question 14
Which reaction pathway diagram represents an endothermic reaction? energy progress of reaction A energy progress of reaction B energy progress of reaction C energy progress of reaction D
- Question 15
Some physical and chemical changes are listed. 1 rusting of iron 2 condensing of steam 3 dissolving of sugar in water 4 cracking of alkanes Which changes are physical changes? A 1 and …
- Question 16
Blue copper(II) sulfate crystals are heated in air until they turn into a white powder. The powder is allowed to cool and after a few days it starts to turn blue. Why does the white powder start to turn blue? …
- Question 17
Carbon reacts with silver oxide to form carbon dioxide and silver. Which substance is reduced? A carbon B carbon dioxide C silver D silver oxide
- Question 18
Base Q dissolves in water to make aqueous Q. Aqueous Q is tested with thymolphthalein. Which row gives the colour of thymolphthalein in aqueous Q and the ion responsible for this colour? colour of thymolphthalein ion A blue H+ B …
- Question 19
Solid calcium hydroxide is added to aqueous ammonium chloride and the mixture is warmed. A gas is produced. What is the name of the gas? A hydrogen B chlorine C carbon dioxide D ammonia
- Question 20
Elements L and M are in the same group of the Periodic Table. Why do L and M have similar chemical properties? A They have the same number of electrons in the nucleus. B They have the same number of …
- Question 21
- Question 22
Which three compounds are all insoluble in water? A ammonium carbonate, silver chloride and sodium sulfate B barium sulfate, calcium chloride and magnesium hydroxide C calcium nitrate, magnesium carbonate and lead(II) hydroxide D calcium sulfate, magnesium hydroxide and silver chloride
- Question 23
18 carat gold contains 75% gold and 25% copper by mass. Which statements about 18 carat gold are correct? 1 It is a mixture. 2 It is a compound. 3 It is an alloy. 4 It conducts electricity. …
- Question 24
The properties of four metals, …
- Question 25
Four substances, or groups of substances, found in water from a natural source are listed. 1 some metal compounds 2 plastics 3 dissolved oxygen 4 nitrates and phosphates from fertilisers and detergents Which substances found in water from a natural …
- Question 26
Which element is used to remove tastes and odours in the treatment of the domestic water supply? A chlorine B carbon C calcium D copper
- Question 27
NPK fertilisers are mixtures of salts used to improve plant growth. Which salt could be used as a component of an NPK fertiliser? A sodium nitrate B aluminium sulfate C magnesium chloride D calcium ethanoate
- Question 28
Plants produce glucose by photosynthesis. What is essential for this process? 1 carbon dioxide 2 oxygen 3 light 4 water A 1 and …
- Question 29
Two reactions, M and N, both form carbon dioxide. M N CaCO3 CO2 CH4 Which types of reaction are M and …
- Question 30
The molecular formulae of four compounds are shown. …
- Question 31
Which type of reaction takes place when pentane reacts with chlorine? A polymerisation B addition C substitution D cracking
- Question 32
Which bar chart shows the percentage composition of natural gas? …
- Question 33
Which statement about alcohols is correct? A Alcohols have the same functional group as carboxylic acids. B Ethanol is an alcohol that is formed by fermentation at …
- Question 34
The equation shows the reaction between ethanoic acid and solid P to produce Q and hydrogen. ethanoic acid …
- Question 35
The diagram shows one repeat unit of a polymer. …
- Question 36
Some properties of a plastic pollutant are listed. 1 It is a poor conductor of electricity. 2 It does not react with water. 3 It is resistant to oxidation. 4 It has low density. Which properties explain why this plastic …
- Question 37
The graph shows the volume of hydrogen produced over time in a chemical reaction. time 0 0 total volume of hydrogen A student uses a stop-watch. Which other item of apparatus is used to take measurements to produce this graph? …
- Question 38
A student uses paper chromatography to identify the food dyes in a coloured sweet, S. The student uses four known food dyes, …
- Question 39
An aqueous cation reacts with aqueous sodium hydroxide to form a white precipitate. The precipitate is insoluble in excess sodium hydroxide. What is the aqueous cation? A aluminium ion B calcium ion C chromium ion D zinc ion
- Question 40
A piece of damp red litmus paper is put into a test-tube of gas. The litmus paper turns white. Which gas is in the test-tube? A ammonia B carbon dioxide C chlorine D oxygen Group The Periodic Table of Elements …
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