Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/23 Oct/Nov 2017 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 3, Oct/Nov 2017: the question paper and its official mark scheme, 40 questions, with the grade thresholds. Free to open, no account needed.
- Questions
- 40
- Marks
- 40
- Grade A from
- 29
File names: 0620_w17_qp_23 · 0620_w17_ms_23
Grade thresholds for 0620/23 Oct/Nov 2017
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 | F | G |
|---|---|---|---|---|---|---|
| 29 | 25 | 22 | 18 | 15 | 12 | 10 |
Topics in this paper
Which syllabus chapters 0620/23 Oct/Nov 2017 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/23 Oct/Nov 2017
- Question 1
Which statement describes sublimation? A Particles moving slowly past each other speed up and move further apart. B Particles vibrating next to each other become mobile and move slowly past each other. C Particles vibrating next to each other start …
- Question 2
25 cm3 of an alkali are added to 20 cm3 of an acid. The temperature change is measured. Which apparatus is not needed in the experiment? A 25 cm3 measuring cylinder B 100 cm3 beaker C balance D thermometer
- Question 3
The painkiller paracetamol is synthesised from 4-aminophenol. Chromatography was carried out on an impure sample of paracetamol. The results are shown (not drawn to scale). …
- Question 4
Which compound is silicon(IV) oxide? melting point / °C good electrical conductor when solid good electrical conductor when molten A –73 no no B 801 no yes C 1495 yes yes D 1710 no no
- Question 5
Carbon has three naturally occurring isotopes, 12C, 13C and 14C. Which statement explains why the isotopes have the same chemical properties? A They have the same number of electrons in the first shell. B They have the same number of …
- Question 6
Which dot-and-cross diagram shows the outer shell electron arrangement in a molecule of carbon dioxide? …
- Question 7
The equation represents the reaction between solid magnesium oxide and dilute hydrochloric acid to form magnesium chloride and water. MgO + 2HCl → MgCl …
- Question 8
A compound contains 34.5% calcium, 24.1% silicon and 41.4% oxygen by mass. What is its empirical formula? A Ca2SiO3 B CaSiO3 C CaSi2O3 D CaSiO6
- Question 9
Which statements about the electrolysis of concentrated copper(II) chloride are correct? 1 Electrons are transferred from the cathode to the copper(II) ions. 2 Electrons move round the external circuit from the cathode to the anode. 3 Chloride ions are attracted …
- Question 10
Which metal combination produces the highest voltage reading in the cells shown? V A Fe Cu V B Zn Cu V C Cu Cu V D Mg Cu
- Question 11
Some bond energies are shown in the table. bond bond energy in kJ / mol …
- Question 12
Which statement describes an exothermic reaction? A The energy absorbed for bond breaking is greater than the energy released by bond formation. B The energy absorbed for bond breaking is less than the energy released by bond formation. C The …
- Question 13
The mass of a beaker and its contents is plotted against time. Which graph represents what happens when sodium carbonate reacts with an excess of dilute hydrochloric acid in an open beaker? mass time A mass time B mass time …
- Question 14
Silver chloride reacts when it is exposed to light. Which row shows what happens to the silver in this process? half-equation type of reaction A Ag → Ag+ + e– oxidation B Ag → Ag+ + e– reduction C Ag+ …
- Question 15
Which statement about the effect of concentration and temperature on the rate of a reaction is not correct? A If the concentration of a reactant is increased, the rate of reaction increases because more particles have sufficient energy to react. …
- Question 16
The following reaction has reached equilibrium in a closed system. 2SO2(g) + O2(g) 2SO3(g) The forward reaction is exothermic. Which row shows the effect of increasing the pressure on the equilibrium mixture? reaction rate amount of SO2 amount of SO3 …
- Question 17
Some properties of four oxides are listed. Oxide 1 reacts with both acids and alkalis to form salts. Oxide 2 reacts with acids to form salts but does not react with alkalis. Oxide 3 reacts with alkalis to form salts …
- Question 18
What is not a typical characteristic of acids? A They react with alkalis producing water. B They react with all metals producing hydrogen. C They react with carbonates producing carbon dioxide. D They turn blue litmus paper red.
- Question 19
Three solids, P, Q and R, all react with dilute sulfuric acid to produce zinc sulfate. P and R produce gases during the reaction. The gas produced when P reacts will not burn. The gas produced when R reacts will …
- Question 20
Which ion forms a green precipitate with aqueous sodium hydroxide that dissolves in an excess of aqueous sodium hydroxide? A Ca2+ B Cr3+ C Cu2+ D Fe2+
- Question 21
A period of the Periodic Table is shown. group I II III IV V VI VII VIII element …
- Question 22
Some properties of element X 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 23
The table gives some properties of an element. melting point in °C 3422 appearance of the element grey appearance of the chloride of the element dark blue density in g / cm3 19.2 electrical conductivity when solid good Which other …
- Question 24
Why is argon gas used to fill electric lamps? A It conducts electricity. B It glows when heated. C It is less dense than air. D It is not reactive.
- Question 25
What is a property of all metals? A conduct electricity B hard C low melting points D react with water
- Question 26
Aluminium is obtained by the electrolysis of a mixture of aluminium oxide and cryolite. Why is cryolite used? A as a catalyst to speed up the process B as a coolant to prevent the process getting too hot C as …
- Question 27
Metal M is mixed with copper to produce brass. What is M? A chromium B nickel C vanadium D zinc
- Question 28
Some metal nitrates and carbonates decompose when heated strongly. Metal Q has a nitrate that decomposes to give a salt and a colourless gas only. The carbonate of metal Q does not decompose when heated with a Bunsen burner. What …
- Question 29
The flow chart shows stages in the treatment of river water to produce drinking water. drinking water stage Y stage X settling tank river water What occurs at stages X and …
- Question 30
A piece of zinc is attached to the hull of a steel boat. Steel is an alloy of iron. Which statement explains why the zinc prevents the iron from rusting? A Zinc is less reactive than iron, and iron is …
- Question 31
The Haber process for making ammonia is carried out at a temperature of 450 °C and a pressure of 200 atmospheres in the presence of a catalyst. Which statement is not correct? A Lowering the pressure increases the rate at …
- Question 32
Which process does not produce carbon dioxide? A combustion of methane B photosynthesis C respiration D thermal decomposition of calcium carbonate
- Question 33
Which row shows the conditions used in the manufacture of sulfuric acid by the Contact process? temperature / °C pressure / atm catalyst …
- Question 34
Some marble chips (calcium carbonate) are heated strongly and substances X and Y are formed. Substance X is a white solid that reacts with water, giving out heat. Substance Y is a colourless gas. What are substances X and …
- Question 35
The structure of compound R is shown. C OH …
- Question 36
Fuel oil and naphtha are two fractions obtained from petroleum. What are the major uses of these fractions? fuel oil naphtha A jet fuel making chemicals B jet fuel making roads C ship fuel making chemicals D ship fuel making …
- Question 37
X, Y and Z are three hydrocarbons. X CH2=CH2 Y CH3–CH=CH2 Z CH3–CH2–CH=CH2 What do compounds X, Y and Z have in common? 1 They are all alkenes. 2 They are all part of the same homologous series. 3 They …
- Question 38
The diagram shows a reaction sequence. butane ethene ethanol carbon dioxide and water …
- Question 39
The structure of an ester is shown. …
- Question 40
The equation shows the formation of a polymer called Kevlar. HOOC COOH …
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