Cambridge IGCSE · 0620 · Paper 1 · Multiple choice (Core)
Chemistry 0620/12 Oct/Nov 2023 past paper
Cambridge IGCSE Chemistry (0620) Paper 1 (Multiple choice (Core)), variant 2, Oct/Nov 2023: 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
- 22
File names: 0620_w23_qp_12 · 0620_w23_ms_12
Grade thresholds for 0620/12 Oct/Nov 2023
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 |
|---|---|---|---|---|
| 22 | 20 | 17 | 15 | 13 |
Topics in this paper
Which syllabus chapters 0620/12 Oct/Nov 2023 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/12 Oct/Nov 2023
- Question 1
The melting points and boiling points of four elements are shown. element melting point / C boiling point …
- Question 2
Which statements about clean, dry air are correct? 1 It is a mixture of elements only. 2 It is a mixture of elements and compounds. 3 It contains only non-metals. A 1 and …
- Question 3
A representation of an atom is shown. …
- Question 4
Which statement describes isotopes of the same element? A They have different electron arrangements. B They have different nuclear charges. C They have nuclei with masses that are the same. D They have the same number of protons.
- Question 5
Potassium reacts with iodine to form potassium iodide. Which statement about potassium iodide is correct? A Each potassium atom shares a pair of electrons with an iodine atom. B In potassium iodide, the particles of potassium have more protons than …
- Question 6
Which row describes the properties of a simple molecular substance? boiling point electrical conductivity when solid A low poor B high poor C low good D high good
- Question 7
Different forms of an element G are used as lubricants and in cutting tools. What is the structure of G? A giant covalent B ionic C metallic D simple covalent
- Question 8
The diagram shows the structure of a molecule of ethyl ethanoate. …
- Question 9
The formula of a compound containing element X is Na2X2O3. The relative formula mass of the compound is 158. What is the relative atomic mass of …
- Question 10
Limestone is used to reduce sulfur dioxide emissions from coal-fired power stations. The equation for the reaction is shown. CaCO3 + SO2 CaSO3 + CO2 What is the smallest mass of CaCO3 required to remove 1 tonne of SO2? …
- Question 11
Which statement about electrolysis is correct? A Bromine and hydrogen are formed during the electrolysis of molten lead(II) bromide. B Metals are formed at the positive electrode. C Molten covalent compounds are broken down by electricity. D Platinum is used …
- Question 12
Which statements about hydrogen-oxygen fuel cells are correct? 1 The reaction between hydrogen and oxygen is endothermic. 2 The waste product in a hydrogen-oxygen fuel cell is water. 3 A chemical reaction in the cell produces hydrogen which is used …
- Question 13
The initial and final temperatures of four different reactions are measured. Which reaction is the least exothermic? initial temperature / C final temperature …
- Question 14
Solid calcium carbonate reacts with dilute hydrochloric acid. Which changes to the reaction conditions increase the rate of reaction? concentration of hydrochloric acid surface area of calcium carbonate A decrease decrease B decrease increase C increase decrease D increase increase
- Question 15
Zinc reacts slowly with dilute sulfuric acid at room temperature. Bubbles of a gas, L, form on the surface of the zinc. When a small amount of copper is added, the reaction is faster. Which row identifies L and explains …
- Question 16
Which reaction shows a colour change from white to blue? A adding water to anhydrous copper(II) sulfate B adding water to hydrated copper(II) sulfate C heating anhydrous copper(II) sulfate D heating hydrated copper(II) sulfate
- Question 17
In a blast furnace, iron(III) oxide is converted to iron and carbon monoxide is converted to carbon dioxide. Fe2O3 + 3CO 2Fe + 3CO2 What happens to each of these reactants? A Both iron(III) oxide and carbon monoxide are …
- Question 18
Which products are formed when magnesium carbonate reacts with dilute hydrochloric acid? A carbon dioxide, hydrogen and magnesium chloride B carbon dioxide and magnesium chloride only C carbon dioxide, water and magnesium chloride D water and magnesium chloride only
- Question 19
Which element forms an oxide that reacts with an aqueous solution of a base? A argon B sulfur C magnesium D copper
- Question 20
Which salt is insoluble? A barium sulfate B lead(II) nitrate C magnesium chloride D sodium carbonate
- Question 21
Some properties of element R are shown. melting point in C 98 boiling point in C 883 reaction with cold water gives off H2 gas reaction when heated with oxygen burns to give a white solid In which part of …
- Question 22
Lithium, sodium and potassium are elements in Group I. Statements about these elements are listed. 1 Lithium is more dense than sodium. 2 Sodium is more reactive than potassium. 3 They all conduct electricity at room temperature. 4 They all …
- Question 23
An outline of the Periodic Table is shown. Y Which name is given to the elements in column Y? A alkali metals B halogens C noble gases D transition elements
- Question 24
Which row describes the properties of a metal that can be used in the manufacture of aircraft? strength density ease of corrosion A high high corrodes easily B high low resists corrosion C low high corrodes easily D low low …
- Question 25
Which metallic element is added to iron in the manufacture of stainless steel? A carbon B copper C lead D nickel
- Question 26
Which statement about the uses of metals is correct? A Aluminium is used in the manufacture of overhead electrical cables as it has a high density. B Aluminium is used to make food containers as it conducts electricity. C Stainless …
- Question 27
The list gives the order of some metals and hydrogen in the reactivity series. Metal X is also included. most reactive K Mg Zn H X least reactive Cu Which row shows the properties of metal X? reacts with dilute …
- Question 28
Which gas in the air is needed for iron to rust? A argon B carbon dioxide C nitrogen D oxygen
- Question 29
Why is limestone added to the blast furnace? A It neutralises the molten slag produced. B It reacts with impurities to form slag. C It releases carbon dioxide which reduces the iron(III) oxide. D It removes acidic gases such as …
- Question 30
Which process removes carbon dioxide from the atmosphere? A photosynthesis B thermal decomposition of calcium carbonate C combustion of fossil fuels D reaction of sodium carbonate with an acid
- Question 31
The flow chart shows stages in the treatment of river water to produce drinking water. drinking water stage K stage J sedimentation tank river water What occurs at stages J and …
- Question 32
Which two compounds can be mixed together to form an NPK fertiliser? A ammonium phosphate and calcium hydroxide B calcium phosphate and ammonium nitrate C potassium nitrate and calcium oxide D potassium phosphate and ammonium nitrate
- Question 33
What are the main substances produced by the fractional distillation of liquid air? A oxygen and carbon dioxide B oxygen and nitrogen C helium and nitrogen D hydrogen and oxygen
- Question 34
Which diagram shows the displayed formula for the named organic compound? …
- Question 35
Poly(ethene) is formed from petroleum using three separate processes. In which order are the processes used? A cracking fractional distillation polymerisation B cracking polymerisation fractional distillation C fractional distillation cracking polymerisation D fractional distillation …
- Question 36
Gas oil and naphtha are two fractions obtained from petroleum. What are uses of gas oil and naphtha? gas oil naphtha A jet fuel making chemicals B jet fuel making roads C diesel engine fuel making chemicals D diesel engine …
- Question 37
Ethene can be polymerised. Which diagram represents the structure of the product formed? …
- Question 38
An acid–base titration is described. ● 25.0 cm3 of dilute aqueous alkali is put into a conical flask. ● Indicator is added to the flask. ● Dilute acid is added to the aqueous alkali until the indicator changes colour. ● …
- Question 39
The apparatus shown is used to separate a mixture. heat What is the mixture? A anhydrous copper(II) sulfate and hydrated copper(II) sulfate B sodium chloride and sand C ethanol and methanol D iron and steel
- Question 40
The results of tests on three gases, X, Y and Z, are shown. test …
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