IGCSE Chemistry 0620 Paper 11, Oct/Nov 2023

The three rectangles show the arrangements of the particles in each of the three states of matter. $X$, $Y$ and $Z$ represent the processes needed to change from one state to another. What are the processes $X$, $Y$ and $Z$?

Which substance is a pure compound? A air B brass C ethanol D petroleum

The Group I element potassium forms an ionic bond with the Group VII element fluorine. Which two ions are produced? A ${\text{K}}^{+}$ and ${\text{F}}^{+}$ B ${\text{K}}^{+}$ and ${\text{F}}^{-}$ C ${\text{K}}^{-}$ and ${\text{F}}^{-}$ D ${\text{K}}^{-}$ and ${\text{F}}^{+}$

An isotope of lithium has the symbol ${}_3^7\text{Li}$. What is the arrangement of electrons in one atom of this isotope of lithium? A B C D

Fluorine, ${\text{F}}_2$, is in the same group of the Periodic Table as chlorine, ${\text{Cl}}_2$. Which diagram represents the arrangement of the outer-shell electrons in a molecule of fluorine? A B C D

Which use of graphite depends on the layers of carbon atoms being able to slide over each other? A cutting tools B electrodes C jewellery D lubricant

Which equations are balanced? 1 ${\text{Fe}}_2{\text{O}}_3+3\text{CO}\to 2\text{Fe}+3{\text{CO}}_2$ 2 ${\text{ZnCO}}_3+2\text{HCl}\to {\text{ZnCl}}_2+{\text{CO}}_2+2{\text{H}}_2\text{O}$ 3 ${\text{Mg(NO}}_3{)}_2+\text{NaOH}\to {\text{Mg(OH)}}_2+2{\text{NaNO}}_3$ 4 ${\text{CaCO}}_3+{\text{H}}_2{\text{SO}}_4\to {\text{CaSO}}_4+{\text{H}}_2\text{O}+{\text{CO}}_2$ A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

The equation for the combustion of methane is shown. $${\text{CH}}_4+2{\text{O}}_2\to {\text{CO}}_2+2{\text{H}}_2\text{O}$$ Which mass of methane produces $36\text{ g}$ of water? A $16\text{ g}$ B $18\text{ g}$ C $32\text{ g}$ D $64\text{ g}$

What is produced at each electrode during the electrolysis of aqueous solutions using inert electrodes?

Which statement about a hydrogen-oxygen fuel cell in a car is correct? A The fuel cell produces heat, which powers the car. B The fuel cell is supplied with hydrogen directly from the air. C The only emission from the fuel cell is nitrogen gas, which is non-polluting. D The fuel cell produces electricity, which powers an electric motor.

The reaction pathway diagram for a reaction is shown. Which statements are correct? 1 The reaction is exothermic. 2 The reaction is endothermic. 3 The temperature of the surroundings increases. 4 The temperature of the surroundings decreases. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Which process involves a chemical change? A adding sodium to water B boiling water C dissolving sodium chloride in water D producing water from aqueous sodium chloride

An experiment is carried out to find the rate of reaction between hydrochloric acid and zinc. $$\text{Zn(s)}+2\text{HCl(aq)}\to {\text{ZnCl}}_2\text{(aq)}+{\text{H}}_2\text{(g)}$$ The results of the experiment are shown. What is the label on the y-axis? A amount of ${\text{ZnCl}}_2$ produced B concentration of $\text{HCl}$ C mass of $\text{Zn}$ reacted D volume of ${\text{H}}_2$ produced

Solid S changes colour from white to blue when water is added. What is S? A anhydrous cobalt(II) chloride B anhydrous copper(II) sulfate C hydrated cobalt(II) chloride D hydrated copper(II) sulfate

Which equation shows the reduction of copper? A $\text{CuO}+\text{C}\to \text{Cu}+\text{CO}$ B $2\text{CuS}+3{\text{O}}_2\to 2\text{CuO}+2{\text{SO}}_2$ C $\text{Cu(g)}\to \text{Cu(l)}$ D $\text{Cu(l)}\to \text{Cu(s)}$

Which solids react with dilute sulfuric acid to form aqueous magnesium sulfate? 1 magnesium 2 magnesium hydroxide 3 magnesium nitrate 4 magnesium oxide A 1, 2 and 4 B 1 and 3 C 2, 3 and 4 D 2 and 4 only

Which statements about an aqueous acid are correct? 1 Ammonia is formed when solid ammonium nitrate is added to an aqueous acid. 2 Effervescence is seen when sodium carbonate is added to an aqueous acid. 3 Methyl orange becomes yellow when added to an aqueous acid. 4 Red litmus remains red when added to an aqueous acid. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Copper(II) sulfate is formed by reacting excess solid copper(II) carbonate with dilute sulfuric acid. Which processes are part of the preparation of solid copper(II) sulfate? 1 crystallisation 2 distillation 3 filtration 4 titration A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Element X forms ions with the formula ${\text{X}}^{2-}$. Which row describes element X?

Which compound is likely to be coloured? A ${\text{KMnO}}_4$ B ${\text{KNO}}_3$ C ${\text{K}}_2{\text{CO}}_3$ D ${\text{K}}_2{\text{SO}}_4$

Chlorine, bromine and iodine are in the same group of the Periodic Table. Which statements about these three elements are correct? 1 Iodine is more reactive than chlorine. 2 They are diatomic covalent molecules. 3 They are all gases at room temperature. 4 Their atoms have seven electrons in their outer shell. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

The electronic configurations of four elements, P, Q, R and S, are shown.

Which elements are unreactive monatomic gases? A P and Q B P and S C Q and R D S only

The table shows some physical properties of four different substances. Which row describes the properties of a non-metallic element?

The equation shows the reaction between a halogen and the aqueous ions of another halogen. $${\text{X}}_2+2{\text{Y}}^{-}\to 2{\text{X}}^{-}+{\text{Y}}_2$$ What is ${\text{X}}_2$ and the colour of ${\text{Y}}^{-}$?

Zinc oxide reacts with carbon to produce zinc. Which equation represents this reaction? A $2\text{ZnO}+\text{C}\to 2\text{Zn}+\text{CO}$ B $2\text{ZnO}+2\text{C}\to 2\text{Zn}+2{\text{CO}}_2$ C $\text{ZnO}+\text{C}\to \text{Zn}+\text{CO}$ D $\text{ZnO}+2\text{C}\to \text{Zn}+2{\text{CO}}_2$

Iron nails are stored in an airtight container. The nails begin to rust after a few days. How can the rusting of the nails be prevented? A Leave the lid off. B Replace the air with argon. C Put the container in a warm place. D Seal the container in a bag.

Four substances present in the blast furnace during iron extraction are listed. 1 calcium carbonate 2 carbon dioxide 3 carbon monoxide 4 iron(III) oxide Which substances are both a reactant and a product during the reactions occurring in the blast furnace? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Which test is used to show that a sample of water is pure? A Evaporate the water to see if any solids remain. B Heat the water to check its boiling point. C Test with anhydrous cobalt(II) chloride. D Use universal indicator paper to check its pH.

Which mixture of salts produces an NPK fertiliser? A ammonium phosphate + potassium sulfate B calcium phosphate + sodium nitrate C potassium nitrate + calcium sulfate D sodium phosphate + ammonium nitrate

What are the main products obtained by the fractional distillation of liquid air? A carbon dioxide and oxygen B carbon dioxide and water vapour C nitrogen and oxygen D nitrogen and water vapour

In which reaction is the rate of reaction increased by light? A carbon dioxide + water $\to$ glucose + oxygen B ethanoic acid + sodium carbonate $\to$ sodium ethanoate + water + carbon dioxide C ethene + bromine $\to$ dibromoethane D methane + oxygen $\to$ carbon dioxide + water

The structures of three organic molecules are shown. Which description of the three molecules is correct?

Petroleum is separated into fractions by fractional distillation. Which row describes a use of the named fraction?

Which statement about alkanes is correct? A They are saturated. B They are very reactive. C They contain carbon, hydrogen and oxygen only. D They contain double bonds.

What is the approximate volume of nitrogen in $200{\text{ cm}}^3$ of air? A $20{\text{ cm}}^3$ B $40{\text{ cm}}^3$ C $80{\text{ cm}}^3$ D $160{\text{ cm}}^3$

The apparatus used to investigate the rate at which hydrogen gas is given off when a piece of magnesium reacts with dilute hydrochloric acid is shown. Which additional piece of apparatus is needed to determine the rate of reaction? A balance B burette C stop-watch D volumetric pipette

Which diagram shows the displayed formula of ethanol? A B C D

Ethane is used as a fuel. Which equation shows the complete combustion of ethane? A $2{\text{C}}_2{\text{H}}_6+7{\text{O}}_2\to 4{\text{CO}}_2+6{\text{H}}_2\text{O}$ B $2{\text{C}}_2{\text{H}}_6+5{\text{O}}_2\to 4\text{CO}+6{\text{H}}_2\text{O}$ C ${\text{C}}_2{\text{H}}_4+3{\text{O}}_2\to 2{\text{CO}}_2+2{\text{H}}_2\text{O}$ D ${\text{C}}_2{\text{H}}_4+2{\text{O}}_2\to 2\text{CO}+2{\text{H}}_2\text{O}$

The equation for the reaction of aqueous calcium nitrate and aqueous sodium hydroxide is shown. $${\text{Ca(NO}}_3{)}_2\text{(aq)}+2\text{NaOH(aq)}\to {\text{Ca(OH)}}_2\text{(s)}+2{\text{NaNO}}_3\text{(aq)}$$ Which process is used to remove calcium hydroxide from the mixture? A chromatography B crystallisation C distillation D filtration

The results of two tests on aqueous compound X are given.

What is X? A iron(III) nitrate B iron(II) nitrate C iron(III) sulfate D iron(II) sulfate