Cambridge O Level · 5070 · Paper 1 · Multiple choice
Chemistry 5070/12 Oct/Nov 2021 past paper
Cambridge O Level Chemistry (5070) Paper 1 (Multiple choice), variant 2, Oct/Nov 2021: 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
- 27
File names: 5070_w21_qp_12 · 5070_w21_ms_12
Grade thresholds for 5070/12 Oct/Nov 2021
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 |
|---|---|---|---|---|
| 27 | 21 | 16 | 13 | 11 |
Topics in this paper
Which syllabus chapters 5070/12 Oct/Nov 2021 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 5070/12 Oct/Nov 2021
- Question 1
In a titration, 25.0 cm3 of aqueous sodium hydroxide is transferred into a conical flask. A few drops of indicator are added. Dilute hydrochloric acid is then added to the flask until the end-point is reached. Which pieces of apparatus …
- Question 2
A student follows the rate of the reaction between marble chips, CaCO3, and dilute hydrochloric acid. CaCO3 + 2HCl CaCl 2 + CO2 + H2O Which diagrams show apparatus that, with a stopwatch, is suitable for this experiment? measuring …
- Question 3
Pure oxygen is needed by many industries. How is pure oxygen obtained in large amounts for such uses? A by decomposition of calcium carbonate B by decomposition of hydrogen peroxide C by filtration of liquid air D by fractional distillation …
- Question 4
An impure sample of compound X has a melting point of …
- Question 5
When aqueous sodium hydroxide is added to aqueous compound X, a red-brown precipitate is formed. When dilute nitric acid followed by aqueous barium nitrate is added to aqueous compound X, a white precipitate is formed. What is X? A chromium(III) …
- Question 6
An aqueous solution of zinc chloride is tested by adding reagents. Which observation is correct? reagent added to zinc chloride (aq) observations A acidified aqueous barium nitrate forms a white precipitate B aqueous ammonia forms a white precipitate, soluble in …
- Question 7
A sample of gas is released at a particular point in a laboratory. A detecting device is placed ten metres from the point where the gas is released. This device detects and records the time when the concentration of the …
- Question 8
The table shows data for some particles. particle proton number nucleon number number of protons number of neutrons number of electrons sodium ion …
- Question 9
A covalent compound P has the empirical formula CH2O. Which structure represents …
- Question 10
Which statement about the structure or bonding of metals is correct? A A metal lattice consists of negative ions in a ‘sea of electrons’. B Electrons in a metal move randomly through the lattice. C Metals are malleable because the …
- Question 11
The relative atomic mass of chlorine is 35.5. What is the mass of 2.0 mol of chlorine gas? …
- Question 12
When gases react, the volume of gaseous reactants may be different from the volume of gaseous products. For which reaction is the percentage change in the volume of gas largest? (Assume each reaction goes to completion.) A 2SO2(g) …
- Question 13
Sodium carbonate reacts with dilute hydrochloric acid. Na2CO3 + 2HCl 2NaCl …
- Question 14
Which statement about the electrolysis of solutions is correct? A During the electrolysis of concentrated aqueous sodium chloride solution, hydrogen is produced at the cathode. B During the electrolysis of dilute sulfuric acid, oxygen is produced at the cathode. C …
- Question 15
The apparatus shown is set up to plate a steel key with copper. steel key copper aqueous copper(II) sulfate + – The key does not get coated with copper. Which change needs to be made to plate the key? A …
- Question 16
The equation shows the reaction of glucose with oxygen. …
- Question 17
The energy profile diagram of a chemical reaction is shown. energy progress of reaction …
- Question 18
The equation shows the reaction for the manufacture of ammonia. …
- Question 19
The apparatus shows a method of following the rate of the reaction between magnesium carbonate, MgCO3, and dilute nitric acid, HNO3. MgCO3(s) + 2HNO3(aq) Mg(NO3)2(aq) …
- Question 20
Aqueous bromine is added to aqueous sodium chloride. Which statement is correct? A Bromine is oxidised and chloride ions are reduced. B Bromine is reduced and chloride ions are oxidised. C Neither oxidation nor reduction takes place. D Sodium ions …
- Question 21
Which statement is correct for all reversible reactions that have reached dynamic equilibrium? A Introduction of a catalyst changes the position of the equilibrium. B The number of moles of products equals the number of moles of reactants. C The …
- Question 22
Which statement about acids and bases is correct? …
- Question 23
Which compound can be formed by precipitation? A NaCl B K2SO4 C Ca(NO3)2 D PbSO4
- Question 24
Which methods could be used to make a pure sample of copper(II) sulfate? 1 acid + metal carbonate 2 acid + metal oxide 3 acid + metal 4 precipitation A 1 and 2 only B 1 and 3 only …
- Question 25
Ammonia is made by a reversible reaction. …
- Question 26
Which statement about sulfur dioxide, SO2, is correct? A It is dissolved in water to make sulfuric acid for car batteries. B It is the final product of the Contact process. C It is used as a food preservative. D …
- Question 27
The diagram shows part of the Periodic Table. …
- Question 28
Which statement about some of the elements in the Periodic Table is correct? A The element germanium, in Group IV, has less metallic character than gallium, in Group III. B Elements in Group V form ions with a charge of …
- Question 29
These statements are about the halogens. 1 All halogens are non-metallic, diatomic molecules. 2 Chlorine displaces both bromine and iodine from aqueous solutions of their salts. 3 The halogens become more reactive on descending Group VII of the Periodic Table. …
- Question 30
Which two statements indicate that metal M may have a proton number between 21 and 30? 1 It conducts electricity. 2 It does not react with water. 3 It forms two basic oxides with formulae MO and M2O3. 4 It …
- Question 31
The table gives properties of four metals, …
- Question 32
Which statements about extracting metals from their ores are correct? 1 Aluminium is extracted by the electrolysis of aluminium oxide dissolved in cryolite. 2 Silver is difficult to extract from its ores because of its low reactivity. 3 Iron is …
- Question 33
Which statements about the corrosion of iron are correct? 1 Corrosion can be prevented by coating the iron with zinc. 2 Corrosion only occurs in the presence of both air and water. 3 Rust is an alloy of iron and …
- Question 34
In the extraction of aluminium from aluminium oxide, the following three reactions take place. 1 Al …
- Question 35
Which statements are correct? 1 Chlorination is used to remove unpleasant tastes from drinking water. 2 Desalination can be achieved using distillation. 3 The presence of phosphates in water and soil encourages plant growth. …
- Question 36
Two isomers are shown. H3C C CH3 H CH3 CH3 CH2 CH2 H3C Which statements about these isomers are correct? 1 They have the same empirical formula. 2 They have different molecular formulae. 3 They are members of the same …
- Question 37
A hydrocarbon compound Q has molecular formula CxHy. Q reacts with hydrogen to form a single product with molecular formula CxHy+2. Which statement about Q is correct? A Q does not burn in air. B Q is a saturated hydrocarbon. …
- Question 38
Which structural formula represents an alcohol? …
- Question 39
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 40
P is a polymer that: ● has six carbon atoms in each of the monomers from which it is formed ● is not a polyester ● is formed using condensation polymerisation. What is the partial structure of P? C (CH2)4 …
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