Cambridge O Level · 5070 · Paper 1 · Multiple choice
Chemistry 5070/11 Oct/Nov 2025 past paper
Cambridge O Level Chemistry (5070) Paper 1 (Multiple choice), variant 1, 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
- 29
File names: 5070_w25_qp_11 · 5070_w25_ms_11
Grade thresholds for 5070/11 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 |
|---|---|---|---|---|
| 29 | 24 | 19 | 16 | 14 |
Topics in this paper
Which syllabus chapters 5070/11 Oct/Nov 2025 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 5070/11 Oct/Nov 2025
- Question 1
The pressure of a sample of air is reduced and its temperature remains constant. Which row describes the changes in the volume of the air and the distance between the particles in the air? volume of air distance between the …
- Question 2
Which substance would diffuse most quickly? A carbon dioxide at …
- Question 3
The main component of mineral X is calcium carbonate, CaCO3. X also contains tiny grains of silicon(IV) oxide, SiO2. There are no other substances in X. Which row shows two correct statements about X? statement 1 statement …
- Question 4
The structure of hydroxylamine, NH2OH, is shown. …
- Question 5
Metals lose electrons when they combine with a non-metal to form an ionic compound. Calcium combines with hydrogen to form the ionic compound calcium hydride, CaH2. How many electrons are there in the outer shell of each of the two …
- Question 6
What is a property of diamond? A It can be used as a lubricant. B It has a melting point below …
- Question 7
Which statement about the bonding in copper is correct? A Copper atoms are attracted to a ‘sea’ of delocalised electrons. B Copper atoms are attracted to a shared pair of electrons. C Copper ions are attracted to a ‘sea’ of …
- Question 8
Aluminium ions, Al 3+, react with sulfate ions, SO4 2–, to form aluminium sulfate. Which row shows the correct empirical formula and ionic formula of aluminium sulfate? empirical formula ionic formula A Al SO4 Al 3+SO4 2– B Al 2S2O8 …
- Question 9
Which statement is correct? A The concentration of a solution is expressed in dm3 / mol. B The empirical formula of a compound always gives the actual numbers of each type of atom in one molecule. C The molecular formula …
- Question 10
How many atoms are there in 27.0 g of water, …
- Question 11
A mixture of sodium hydrogencarbonate and sodium chloride is heated. The equation for the reaction that takes place when sodium hydrogencarbonate is heated is shown. 2NaHCO3(s) Na2CO3(s) + CO2(g) + H2O(g) Sodium chloride is unchanged on heating. When 6.0 …
- Question 12
Electrolysis is used to plate a metal statue with silver. The statue is an electrode in a suitable electrolyte. Which row is correct? statue electrolyte A cathode AgCl (aq) B cathode AgNO3(aq) C anode AgCl (aq) D anode AgNO3(aq)
- Question 13
Which row is correct? purpose of hydrogen–oxygen fuel cell chemical product of hydrogen–oxygen fuel cell A to recycle waste hydrogen B to recycle waste water C to produce electrical energy hydrogen D to produce electrical energy water
- Question 14
Some bond energy data are given in the table. bond bond energy kJ / mol …
- Question 15
The rate of reaction between calcium carbonate and dilute hydrochloric acid is measured in three separate experiments. dilute hydrochloric acid mass balance 2 g calcium carbonate cotton wool In experiment 1, the calcium carbonate is powdered, and an excess of …
- Question 16
The equation shows the reversible reaction between nitrogen and hydrogen to form ammonia. …
- Question 17
Which statement is correct? A Ethanoic acid is a weak acid because when it is added to excess alkali not all of the ethanoic acid reacts. B Ethanoic acid is a weaker acid than sulfuric acid because a smaller proportion …
- Question 18
Some properties of a solid oxide are listed. ● It reacts with dilute sulfuric acid giving a salt and water. ● It is insoluble in water. ● It reacts with aqueous sodium hydroxide. Which oxide is being described? A aluminium …
- Question 19
Two compounds are dissolved separately in water. When the two solutions are mixed, there is no observable change. What are the two compounds? A sodium chloride and barium nitrate B sodium chloride and lead nitrate C sodium sulfate and barium …
- Question 20
Part of the Periodic Table is shown. …
- Question 21
The Group I metals lithium, sodium and potassium show trends in their melting points and in their reactions with water. Which statement is correct going down the group from lithium to potassium? A Their melting points decrease and their reaction …
- Question 22
Chlorine gas is bubbled into separate samples of aqueous potassium iodide and aqueous potassium bromide. In which solutions is there a colour change? aqueous potassium iodide aqueous potassium bromide …
- Question 23
Which statement about the elements in Group VIII of the Periodic Table is correct? A Going down the group, the number of electrons in the atom increases by eight for each noble gas. B Going down the group, the number …
- Question 24
Which statement is correct? A Aluminium is used in food containers because of its resistance to corrosion. B Aluminium is used in the manufacture of aircraft because of its low ductility. C Copper is used in electrical wiring because of …
- Question 25
Which elements are the major constituents of brass? A Br and As B Cu and Sn C Cu and Zn D Sn and Zn
- Question 26
The diagrams show two methods in which metal X is used to prevent the rusting of iron. block of metal X iron coating of metal X iron A student suggests that metal X must be less reactive than iron and …
- Question 27
Aluminium is extracted from molten aluminium oxide by electrolysis. Which material is used for the electrodes in the industrial extraction? A aluminium B carbon C cryolite D platinum
- Question 28
Which substance is used to remove odours in the treatment of the domestic water supply? A carbon B chlorine C fluorine D silver
- Question 29
Carbon dioxide, methane and oxygen are gases involved in the carbon cycle. Which of these gases cause global warming? A carbon dioxide only B carbon dioxide and methane C carbon dioxide and oxygen D methane only
- Question 30
How many structural isomers are there with the molecular formula C4H9Cl …
- Question 31
P is a branched hydrocarbon with the ratio of carbon atoms to hydrogen atoms being …
- Question 32
Which row gives the correct names of the two compounds? CH3CH2CH=CH2 CH3CH(OH)CH3 A but-1-ene propan-1-ol B but-1-ene propan-2-ol C but-2-ene propan-1-ol D but-2-ene propan-2-ol
- Question 33
Which equation represents the reaction of ethane with chlorine in the presence of ultraviolet light? A CH3CH3 + Cl 2 CH3CH3Cl + Cl B CH3CH3 + Cl 2 CH3CH2Cl + HCl C CH3CH3 + Cl 2 CH2Cl …
- Question 34
Which compound reacts with hydrogen in an addition reaction? A CH3CHCHCH3 B CH3CH2CH2CH3 C CH3CH2CH2COOH D CH3CH2CH2CH2OH
- Question 35
Which statement about carboxylic acids is correct? A They are prepared by the oxidation of alkanes. B They decolourise bromine water. C They react with alcohols to form esters. D They react with carbonates to form a salt, hydrogen and …
- Question 36
The structures of X and Y are shown. C O HO (CH2)4 …
- Question 37
Which diagram shows a measuring cylinder? …
- Question 38
A chromatogram of mixture X and pure substances …
- Question 39
Sulfur dioxide is a gas that is prepared by heating sodium sulfite with hydrochloric acid. It is an acidic gas. Sulfur dioxide is more dense than air. Which set of apparatus is suitable for preparing and collecting a dry sample …
- Question 40
A colourless solution of compound W is tested separately with a few drops of aqueous sodium hydroxide and a few drops of aqueous ammonia. No precipitate is observed in either of the tests. What is the cation in W? A …
Other Chemistry papers from Oct/Nov 2025
- 5070/12 Multiple choice
- 5070/21 Theory
- 5070/22 Theory
- 5070/41 Alternative to Practical
- 5070/42 Alternative to Practical