IGCSE Chemistry 0620/22 Past Paper, Oct/Nov 2023

0620/22 · Oct/Nov 2023

Part of a cooling curve for water is shown. What is occurring between points X and Y? A Steam is condensing into water. B The temperature of the water is decreasing. C Ice is melting. D Particles are losing heat to the surroundings.

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 3 B 1 only C 2 and 3 D 2 only

A representation of an atom is shown. What is the nucleon number of this atom? A 6 B 7 C 12 D 13

The percentage abundances of three isotopes in a sample of neon are shown.

isotope	percentage abundance / %
$_{10}^{20} N e$	$90.48$
$_{10}^{21} N e$	$0.27$
$_{10}^{22} N e$	$9.25$

What is the relative atomic mass, $A_{r}$ , of this sample of neon? A 10.19 B 20.19 C 21.00 D 30.19

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 electrons. C Potassium iodide has a high melting point because it is a covalent compound. D Potassium iodide has a low melting point because it is an ionic compound.

Which substance has the lowest melting point? A graphite B methanol C silicon(IV) oxide D sodium chloride

The diagram shows the structure of a molecule of ethyl ethanoate. What is the molecular formula of a molecule of ethyl ethanoate? A $C H O$ B $C_{4} H_{8} O_{2}$ C $C_{4} (H_{2})_{2} (O_{2})$ D $C_{2} H_{4} O$

A hydrocarbon contains 85.7% of carbon by mass. What is the empirical formula of the hydrocarbon? A ${C H}_{2}$ B ${C H}_{4}$ C $C_{2} H_{5}$ D $C_{3} H_{6}$

The formula of a compound containing element X is ${N a}_{2} X_{2} O_{3}$ . The relative formula mass of the compound is 158. What is the relative atomic mass of X? A 32 B 59.5 C 64 D 119

Dilute aqueous potassium chloride is electrolysed using platinum electrodes. Which row identifies the product at each electrode?

	anode	cathode
$A$	chlorine	hydrogen
$B$	chlorine	potassium
$C$	oxygen	hydrogen
$D$	oxygen	potassium

Concentrated aqueous copper(II) chloride is electrolysed using copper electrodes, as shown. What happens to the mass of each electrode during this process?

	positive electrode	negative electrode
$A$	decreases	decreases
$B$	decreases	increases
$C$	increases	decreases
$D$	increases	increases

The initial and final temperatures of four different reactions are measured. Which reaction is the least exothermic?

	${initial temperature /}^{\circ} C$	${final temperature /}^{\circ} C$
$A$	$19$	$25$
$B$	$21$	$18$
$C$	$22$	$17$
$D$	$22$	$26$

Which equation represents an endothermic reaction? A ${C l}_{2} (g) \to 2 C l (g)$ B ${C H}_{4} (g) + 2 O_{2} (g) \to {C O}_{2} (g) + 2 H_{2} O (l)$ C $H (g) + H (g) \to H_{2} (g)$ D $2 K (s) + 2 H_{2} O (l) \to 2 K O H (a q) + H_{2} (g)$

Methane burns in oxygen to form carbon dioxide and water. ${C H}_{4} (g) + 2 O_{2} (g) \to {C O}_{2} (g) + 2 H_{2} O (l)$ The bond energies are shown.

bond	bond energy in kJ / mol
$C - H$	$410$
$C - O$	$360$
$C = O$	$805$
$O - H$	$460$
$O - O$	$146$
$O = O$	$496$

What is the energy change for this reaction? A $- 818 kJ / mol$ B $- 102 kJ / mol$ C $+ 102 kJ / mol$ D $+ 818 kJ / mol$

Hydrochloric acid is added to excess calcium carbonate in two separate experiments. Two different concentrations of hydrochloric acid are used but the temperature is the same in both experiments. The graph of the results shows the volume of carbon dioxide gas given off over time. Which row is correct?

	$particles in 2.0 {mol / dm}^{3} compared to 1.0 {mol / dm}^{3}$
	collision rate	collision energy
$A$	higher	no change
$B$	higher	higher
$C$	lower	no change
$D$	lower	higher

The decomposition of dinitrogen tetroxide, $N_{2} O_{4}$ , into nitrogen dioxide, ${N O}_{2}$ , is a reversible reaction. The equation for the reaction is shown. $N_{2} O_{4} (g) ⇌ 2 {N O}_{2} (g)$ The forward reaction is endothermic. Which row shows the effect on the position of equilibrium and the rate of the reverse reaction when the temperature is increased?

	position of equilibrium	rate of the reverse reaction
$A$	shifts to the left	decreases
$B$	shifts to the left	increases
$C$	shifts to the right	decreases
$D$	shifts to the right	increases

In a blast furnace, iron(III) oxide is converted to iron and carbon monoxide is converted to carbon dioxide. ${F e}_{2} O_{3} + 3 C O \to 2 F e + 3 {C O}_{2}$ What happens to each of these reactants? A Both iron(III) oxide and carbon monoxide are oxidised. B Both iron(III) oxide and carbon monoxide are reduced. C Iron(III) oxide is oxidised and carbon monoxide is reduced. D Iron(III) oxide is reduced and carbon monoxide is oxidised.

Which row describes what happens to ${F e}^{2 +}$ ions when they are oxidised?

	electron movement	oxidation number of iron
$A$	they gain electrons	decreases
$B$	they gain electrons	increases
$C$	they lose electrons	decreases
$D$	they lose electrons	increases

In which reaction does an acid react with a base? A Dilute sulfuric acid is added to a piece of magnesium ribbon producing hydrogen. B Dilute sulfuric acid is added to aqueous barium chloride producing a white precipitate of barium sulfate. C Aqueous sodium hydroxide is added to aqueous copper(II) sulfate producing a blue precipitate of copper(II) hydroxide. D Aqueous sodium hydroxide is added to solid ammonium sulfate producing gaseous ammonia.

Which element forms an oxide that reacts with an aqueous solution of a base? A argon B sulfur C magnesium D copper

Which method is used to produce insoluble salts? A addition of excess insoluble base to an acid B addition of excess metal to an acid C precipitation using two aqueous solutions D titration using an acid and an alkali

The noble gases are in Group VIII of the Periodic Table. Some properties of the first four noble gases are shown.

noble gas	${boiling point in}^{\circ} C$	$density in {g / d m}^{3}$
helium	$- 267$	$0.179$
neon	$- 246$	$0.900$
argon	$- 186$	$1.782$
krypton	$- 152$	$3.708$

Which row identifies the trends in boiling point and in density as Group VIII is descended?

	boiling point	density
$A$	decreasing	increasing
$B$	increasing	increasing
$C$	decreasing	decreasing
$D$	increasing	decreasing

Some properties of element R are shown.

${melting point in}^{\circ} C$	$98$
${boiling point in}^{\circ} C$	$883$
reaction with cold water	$gives off H_{2} gas$
reaction when heated with oxygen	burns to give a white solid

In which part of the Periodic Table is R found? A Group I B Group VII C Group VIII D transition elements

Which pair of compounds shows that transition elements have variable oxidation states? A ${C r}_{2} O_{3}$ and ${C r B r}_{3}$ B ${C u S O}_{4}$ and ${C u C l}_{2}$ C ${F e}_{2} O_{3}$ and ${F e C l}_{2}$ D $N i O$ and ${N i C l}_{2}$

The list gives the order of some metals and hydrogen in the reactivity series. Metal X is also included.

most reactive	$K$
	$M g$
	$Z n$
	$H$
	$X$
least reactive	$C u$

Which row shows the properties of metal X?

	reacts with dilute acids	oxide reduced by carbon
$A$	no	no
$B$	no	yes
$C$	yes	no
$D$	yes	yes

When zinc is added to an aqueous solution containing magnesium ions, there is no reaction. Which species has the greatest tendency to lose electrons? A $M g$ B ${M g}^{2 +}$ C $Z n$ D ${Z n}^{2 +}$

Which gas in the air is needed for iron to rust? A argon B carbon dioxide C nitrogen D oxygen

Which coating prevents iron from rusting even when the coating is damaged? A grease B paint C plastic D zinc

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 carbon dioxide.

The flow chart shows stages in the treatment of river water to produce drinking water. $river water \to sedimentation tank \to stage J \to stage K \to drinking water$ What occurs at stages J and K?

	J	K
$A$	distillation	chlorination
$B$	distillation	filtration
$C$	filtration	chlorination
$D$	filtration	distillation

Carbon dioxide acts as a greenhouse gas by interacting with a particular type of energy that radiates from the Earth's surface into the atmosphere. Which type of energy is involved and what happens when this energy interacts with carbon dioxide molecules?

	type of energy involved	what happens
$A$	thermal	carbon dioxide molecules increase the Earth's energy loss to space
$B$	thermal	carbon dioxide molecules absorb the energy
$C$	light	carbon dioxide molecules increase the Earth's energy loss to space
$D$	light	carbon dioxide molecules absorb the energy

Oxides of nitrogen, such as $N O$ and ${N O}_{2}$ , are formed in the petrol engines of cars. They are removed from the exhaust gases by reactions in the car's catalytic converter. Which row describes how oxides of nitrogen are formed in a petrol engine and a reaction that happens in the catalytic converter?

	how oxides of nitrogen are formed	a reaction that happens in the catalytic converter
$A$	by the reaction between nitrogen and oxygen from the air	$2 N O + 2 C O \to N_{2} + 2 {C O}_{2}$
$B$	by the reaction between nitrogen and oxygen from the air	$2 N O + 2 H_{2} \to N_{2} + 2 H_{2} O$
$C$	by the reaction between nitrogen compounds in petrol and oxygen from the air	$2 N O + 2 C O \to N_{2} + 2 {C O}_{2}$
$D$	by the reaction between nitrogen compounds in petrol and oxygen from the air	$2 N O + 2 H_{2} \to N_{2} + 2 H_{2} O$

Which diagram shows the displayed formula for the named organic compound? A ethanoic acid B ethene C ethanol D methane

What is the total number of covalent bonds in a molecule of butane, $C_{4} H_{10}$ ? A 3 B 10 C 13 D 14

Propane reacts with chlorine in a substitution reaction. Which reaction condition is required for the reaction to occur? A acid catalyst B iron catalyst C temperature of $400^{\circ} C$ D ultraviolet light

The structure of an organic compound is shown. Which structure represents a molecule that reacts with steam to produce this product? A ${C H}_{2} = {C H}_{2}$ B ${C H}_{3} {C H}_{2} {C H}_{3}$ C ${C H}_{3} {C H}_{2} O H$ D ${C H}_{3} C H = {C H}_{2}$

Which term describes nylon? A addition polymer B natural polymer C polyamide D polyester

Ethene can be polymerised. Which diagram represents the structure of the product formed?

An acid–base titration is described. $∙$ $25.0 {cm}^{3}$ 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. $∙$ The volume of acid used is then recorded. Which use of apparatus is correct? A The $25.0 {cm}^{3}$ of aqueous alkali is measured using a volumetric pipette. B The $25.0 {cm}^{3}$ of aqueous alkali is measured using the lines on the conical flask. C The volume of acid is measured using a measuring cylinder. D The volume of acid is measured using a volumetric pipette.

Substance Q is investigated using chromatography. The chromatogram is shown. The diagram is not drawn to scale. What is the $R_{f}$ value of Q? A 0.60 B 0.64 C 0.69 D 0.72

IGCSE Chemistry 0620 Paper 22, Oct/Nov 2023

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