IGCSE Chemistry 0620/13 Past Paper, May/June 2024

0620/13 · May/June 2024

Which two processes are required to change ice into steam? A boiling and melting B boiling and freezing C condensing and melting D condensing and freezing

Which row describes how the volume of a gas changes when the temperature increases, or when the pressure increases?

	temperature increases	pressure increases
$A$	volume decreases	volume decreases
$B$	volume decreases	volume increases
$C$	volume increases	volume decreases
$D$	volume increases	volume increases

Four substances in a mixture are listed. • calcium nitrate • iron(II) sulfate • oxygen • water Which statement describes the mixture? A It contains 6 elements. B It contains 3 compounds and 1 element. C It contains 2 compounds and 2 elements. D It contains 4 compounds.

An ion is represented by the symbol $_{8}^{18} O^{2 -}$ . Which statements about this ion are correct? 1 The ion contains 8 electrons. 2 The ion contains 10 neutrons. 3 The ion contains 8 protons. A 1 and 2 B 1 and 3 C 2 only D 2 and 3

What is the meaning of the term nucleon number? A the number of neutrons in the nucleus of an atom B the number of protons in the nucleus of an atom C the total number of protons and electrons in the nucleus of an atom D the total number of protons and neutrons in the nucleus of an atom

Which row describes the electrical conductivity of covalent and ionic compounds when solid and when molten?

	covalent compounds		ionic compounds
	$conductivitywhen solid$	$conductivitywhen molten$	$conductivitywhen solid$	$conductivitywhen molten$
$A$	X	X	X	$✓$	key
$B$	X	$✓$	X	$✓$	$✓ = good conductivity$
$C$	$✓$	$✓$	X	X	$X = poor conductivity$
$D$	X	$✓$	$✓$	$✓$

Which statement about the bonding in sodium chloride is correct? A The sodium and chlorine atoms share pairs of electrons. B The chlorine atoms give electrons to the sodium atoms to form positive and negative ions. C There is covalent bonding between sodium and chlorine. D The positive and negative ions have noble gas electronic configurations.

The diagram shows the arrangement of carbon atoms in a giant covalent structure. Which row identifies the substance and describes a use of this substance?

	substance	use of substance
$A$	diamond	It is an electrode because electrons can move.
$B$	diamond	It is used as a cutting tool because atoms are strongly bonded together.
$C$	graphite	It is used as an insulator because electrons cannot move.
$D$	graphite	It is a lubricant because atoms can slide over each other.

Which statement is the correct definition for molecular formula? A an atom or group of atoms that determine the chemical properties of a compound B a structure which shows all the atoms and all the bonds in a compound C the number and arrangement of different atoms in one gram of a compound D the number and type of different atoms in one molecule of a compound

A compound, T, has the formula ${CH}_{3} Cl$ . Three statements about this compound are listed. 1 A molecule of the compound contains five atoms. 2 A molecule of the compound contains five different elements. 3 The relative molecular mass of the compound is 50.5. Which statements are correct? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Iron water taps are often electroplated with a layer of chromium. Which statements explain why iron water taps are electroplated? 1 It improves the appearance of the taps. 2 It increases the strength of the taps. 3 It prevents the corrosion of the taps. 4 It improves the electrical conductivity of the taps. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Molten caesium bromide is electrolysed using inert electrodes. Which row identifies the product at each electrode?

	anode	cathode
$A$	bromine	caesium
$B$	caesium	bromine
$C$	hydrogen	oxygen
$D$	oxygen	hydrogen

Which equation represents the overall reaction in a hydrogen–oxygen fuel cell? A $4 H + O_{2} \to 2 H_{2} O$ B $2 H_{2} + O_{2} \to 2 H_{2} O$ C $H_{2} + O_{2} \to H_{2} O$ D $2 H + O \to H_{2} O$

Which statements about endothermic reactions are correct? 1 The energy of the products is greater than the energy of the reactants. 2 The energy of the reactants is greater than the energy of the products. 3 The temperature of the surroundings increases during the reaction. 4 The temperature of the surroundings decreases during the reaction. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Which process is a physical change? A firework exploding B burning wood C chocolate melting D iron rusting

Magnesium reacts with dilute hydrochloric acid, $HCl$ , to produce hydrogen gas. Which row identifies the reaction conditions that give the fastest rate of reaction?

	$temperature {in}^{\circ} C$	$HCl concentrationin {mol/dm}^{3}$	magnesium solid
$A$	$30$	$1.0$	powder
$B$	$40$	$2.0$	powder
$C$	$30$	$1.0$	ribbon
$D$	$40$	$2.0$	ribbon

Which reaction produces a white-coloured substance? A adding water to anhydrous cobalt(II) chloride B adding water to anhydrous copper(II) sulfate C heating hydrated cobalt(II) chloride D heating hydrated copper(II) sulfate

In a blast furnace, iron is extracted when iron(III) oxide reacts with carbon monoxide. The equation is shown. ${Fe}_{2} O_{3} + 3 CO \to 2 Fe + 3 {CO}_{2}$ Which substance is oxidised and which is reduced in this reaction?

	oxidised	reduced
$A$	CO	${Fe}_{2} O_{3}$
$B$	${CO}_{2}$	Fe
$C$	Fe	${CO}_{2}$
$D$	${Fe}_{2} O_{3}$	CO

Which row shows the colours of litmus and methyl orange with solutions of acids or bases?

	solution	litmus	methyl orange
$A$	acid	red	red
$B$	acid	blue	yellow
$C$	base	blue	red
$D$	base	red	yellow

Aqueous sodium hydroxide is reacted with excess dilute hydrochloric acid. Which ion causes the resulting mixture to be acidic? A ${Na}^{+}$ B $H^{+}$ C ${OH}^{-}$ D ${Cl}^{-}$

Universal indicator is added to an aqueous solution of oxide X. The indicator changes colour from green to red. What is X? A $MgO$ B $CaO$ C $K_{2} O$ D ${NO}_{2}$

Which rows identify two aqueous salts which react together to produce a precipitate?

	salt 1	salt 2
$1$	sodium sulfate	barium nitrate
$2$	sodium chloride	barium sulfate
$3$	barium chloride	lead(II) nitrate
$4$	lead(II) chloride	barium nitrate

A 1 and 4 B 1 and 3 C 2 and 3 D 2 and 4

Which statements about elements in the Periodic Table are correct? 1 Elements in the same group have the same number of electrons in their outer shell. 2 Elements in the same period have the same number of occupied electron shells. 3 The elements are arranged in order of their atomic mass. 4 Every period contains eight elements. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Four mixtures each contain a halogen and an aqueous sodium halide. Which row describes what happens in the mixtures shown?

	mixture	description
$A$	iodine + sodium bromide	$A displacement reaction occurs becauseiodine is more reactive than bromine.$
$B$	bromine + sodium chloride	$A displacement reaction occurs becausechlorine is more reactive than bromine.$
$C$	chlorine + sodium bromide	$A displacement reaction occurs becausechlorine is more reactive than bromine.$
$D$	bromine + sodium iodide	$A displacement reaction occurs becauseiodine is more reactive than bromine.$

Which row describes a transition element?

	$densityin {g/cm}^{3}$	$colour ofchloride$
$A$	$0.98$	green
$B$	$0.98$	white
$C$	$8.90$	green
$D$	$8.90$	white

Which statement about the use of metals is correct? A Aluminium has a high strength and high density so is used to make aircraft. B Copper has a low melting point so is used in electrical wiring. C Aluminium is resistant to corrosion so is used in food containers. D Zinc is used to make the alloy stainless steel which is used in cutlery.

Which statements explain why stainless steel is used in cutlery? 1 It is resistant to rusting. 2 It is a hard material. 3 It is a pure metal. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Four different metals are separately mixed with an equal volume of dilute hydrochloric acid. The table shows the rate of effervescence for each metal.

metal	$rate ofeffervescence$
calcium	very high
copper	none
iron	low
magnesium	high

What is the order of reactivity of the four metals starting with the most reactive? A $iron \to magnesium \to calcium \to copper$ B $magnesium \to calcium \to copper \to iron$ C $copper \to iron \to magnesium \to calcium$ D $calcium \to magnesium \to iron \to copper$

Which statement about the rusting of iron is correct? A The rusting of iron forms hydrated iron(II) oxide. B Barrier methods prevent rusting by excluding nitrogen and water. C A piece of iron submerged in water will not rust. D Coating with plastic is a barrier method that prevents iron rusting.

Water is extracted from a river for use in a domestic water supply. Some treatments for domestic water are listed. • chlorination • sedimentation and filtration • treatment with carbon Which statement about these treatments is correct? A Filtration is used to remove soluble substances. B Treatment with carbon is used to remove unpleasant odours. C Chlorination is used to remove unpleasant tastes. D Sedimentation is used to kill microbes.

A farmer knows his soil needs phosphorus and potassium. He has a choice of four fertilisers. 1 ${NH}_{4} {NO}_{3}$ 2 $({NH}_{4})_{3} {PO}_{4}$ 3 ${KNO}_{3}$ 4 $({NH}_{2})_{2} CO$ Which fertilisers should he use? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Which strategies are useful in reducing the production of acid rain? 1 planting trees 2 using catalytic converters in motor vehicles 3 reducing livestock farming 4 using low-sulfur fuels A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

The structures of four organic compounds, W, X, Y and Z, are shown. Which compounds are members of the same homologous series? A W and X B W and Z C X and Y D Y and Z

Which molecular formula represents an alkene? A $C_{2} H_{6} O$ B $C_{2} H_{6}$ C ${CH}_{4}$ D $C_{3} H_{6}$

Which row identifies the petroleum fractions used to reduce the friction between metal parts in engines and as a fuel in cars?

	$fraction used to reducefriction in engines$	$fraction used as afuel in cars$
$A$	gas oil	gasoline
$B$	gas oil	fuel oil
$C$	lubricating oil	fuel oil
$D$	lubricating oil	gasoline

Four fuels are listed. 1 ethanol 2 coal 3 hydrogen 4 natural gas Which fuels are fossil fuels? A 1, 2 and 3 B 1 and 3 only C 2 and 4 D 4 only

Aqueous bromine is added to two test-tubes. Excess hexene is added to one test-tube. Excess hexane is added to the second test-tube. Which row describes the observation in each test-tube?

	hexene	hexane
$A$	orange to colourless	orange to colourless
$B$	orange to colourless	remains orange
$C$	colourless to orange	remains colourless
$D$	remains orange	orange to colourless

The structure of a compound, G, is shown. G is in the same homologous series as ethanoic acid. Which row describes an aqueous solution of G?

	$produces a gas withmagnesium$	$turns methyl orangeyellow$
$A$	no	yes
$B$	no	no
$C$	yes	no
$D$	yes	yes

When zinc reacts with dilute sulfuric acid, hydrogen gas is produced. Which apparatus is needed to investigate the effect of temperature on the rate of this reaction? 1 thermometer 2 stop-watch 3 volumetric pipette 4 gas syringe A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Two tests are carried out on substance Z. test 1 A flame test produces a red flame. test 2 Z is dissolved in water and dilute nitric acid is added, followed by aqueous silver nitrate. A yellow precipitate is produced. What is substance Z? A lithium bromide B lithium iodide C sodium bromide D sodium iodide

IGCSE Chemistry 0620 Paper 13, May/June 2024

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