IGCSE Chemistry 0620 Paper 11, May/June 2024

The boiling point of sodium is ${890}^{\circ }\mathrm{C}$. What happens to sodium atoms as the temperature of a sample of sodium changes from ${950}^{\circ }\mathrm{C}$ to ${900}^{\circ }\mathrm{C}$? A The atoms move more quickly and bonds are formed. B The atoms move more quickly and bonds are neither broken nor formed. C The atoms move more slowly and bonds are formed. D The atoms move more slowly and bonds are neither broken nor formed.

Which row shows the conditions for the particles of a gas colliding most frequently?

The diagram shows some properties of particles in an atom. To which labelled part of the diagram do electrons belong? A B C D

Some properties of substances W, X, Y and Z are shown.

Which substances are ionic? A W, X and Y B W and Y only C W and Z D X and Z

Atoms lose or gain electrons to become ions. Which row is correct?

A covalent molecule, M, contains four shared pairs of electrons. What is M? A ammonia, ${\mathrm{N}\mathrm{H}}_3$ B hydrogen chloride, $\mathrm{H}\mathrm{C}\mathrm{l}$ C methane, ${\mathrm{C}\mathrm{H}}_4$ D water, ${\mathrm{H}}_2\mathrm{O}$

Which substance has a giant covalent structure? A sodium chloride B sodium C ethane D diamond

Iron(III) oxide is reduced by carbon monoxide to produce iron and carbon dioxide. What is the balanced equation for this reaction? A ${\mathrm{F}\mathrm{e}}_2{\mathrm{O}}_3+2\mathrm{C}\mathrm{O}\to 2\mathrm{F}\mathrm{e}+2{\mathrm{C}\mathrm{O}}_2$ B ${\mathrm{F}\mathrm{e}}_2{\mathrm{O}}_3+3\mathrm{C}\mathrm{O}\to 2\mathrm{F}\mathrm{e}+3{\mathrm{C}\mathrm{O}}_2$ C $2{\mathrm{F}\mathrm{e}}_2{\mathrm{O}}_3+6\mathrm{C}\mathrm{O}\to 2\mathrm{F}\mathrm{e}+6{\mathrm{C}\mathrm{O}}_2$ D $2{\mathrm{F}\mathrm{e}}_2{\mathrm{O}}_3+3\mathrm{C}\mathrm{O}\to 4\mathrm{F}\mathrm{e}+3{\mathrm{C}\mathrm{O}}_2$

The equation for the reaction between magnesium and dilute hydrochloric acid is shown. $$\mathrm{M}\mathrm{g}+2\mathrm{H}\mathrm{C}\mathrm{l}\to {\mathrm{M}\mathrm{g}\mathrm{C}\mathrm{l}}_2+{\mathrm{H}}_2$$ Which mass of magnesium chloride is formed when $48.0\mathrm{g}$ of magnesium completely reacts with excess dilute hydrochloric acid? A $23.8\mathrm{g}$ B $47.5\mathrm{g}$ C $95.0\mathrm{g}$ D $190\mathrm{g}$

Dilute sulfuric acid and lead(II) bromide are electrolysed separately. Which statements are correct? 1 Colourless gases are produced when dilute sulfuric acid is electrolysed. 2 Lead(II) bromide can be electrolysed when molten. 3 Lead is formed at the positive electrode when lead(II) bromide is electrolysed. 4 Sulfate ions are produced at the negative electrode when dilute sulfuric acid is electrolysed. A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4

Which statements about a hydrogen–oxygen fuel cell are correct? 1 The main form of energy released by the fuel cell is heat. 2 The reaction is a redox reaction. 3 An acidic gas is produced. 4 Water is the only chemical product. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Which row describes what happens during an endothermic reaction?

Which diagram represents a chemical change? A B C D

A method used to investigate the rate of reaction of calcium carbonate with dilute hydrochloric acid under different conditions is shown. • Place $50{\mathrm{c}\mathrm{m}}^3$ of dilute hydrochloric acid in a conical flask. • Add a known volume of water to the conical flask. • Heat the conical flask to the required temperature. • Add $1.0\mathrm{g}$ of calcium carbonate to the conical flask. • Measure the time taken for the reaction to finish. Which volume of water and which temperature give the shortest time taken for the reaction to finish?

The rate of reaction between magnesium and hydrochloric acid is investigated. The total volume of hydrogen given off is measured at different times. A graph of the results is shown. Which conclusions are correct? 1 The rate is fastest between 0 and 30 seconds. 2 The maximum volume of hydrogen given off is $22{\mathrm{c}\mathrm{m}}^3$. 3 At 40 seconds, $20{\mathrm{c}\mathrm{m}}^3$ of hydrogen is given off. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

Water is added to anhydrous copper(II) sulfate. Which row describes the direction of energy change and the colour change of the mixture during the reaction?

Which equation represents an oxidation reaction? A ${\mathrm{C}\mathrm{a}\mathrm{C}\mathrm{O}}_3\to \mathrm{C}\mathrm{a}\mathrm{O}+{\mathrm{C}\mathrm{O}}_2$ B $4\mathrm{F}\mathrm{e}\mathrm{O}+{\mathrm{O}}_2\to 2{\mathrm{F}\mathrm{e}}_2{\mathrm{O}}_3$ C $2{\mathrm{N}\mathrm{O}}_2\to {\mathrm{N}}_2{\mathrm{O}}_4$ D $2{\mathrm{P}}_2{\mathrm{O}}_5\to {\mathrm{P}}_4{\mathrm{O}}_{10}$

A farmer treats a field with calcium hydroxide to make it less acidic. When the farmer adds ammonium nitrate fertiliser to the field immediately after the calcium hydroxide, the two substances react. Why does this reaction make the fertiliser less effective? A It makes ammonia gas, so less nitrogen is absorbed by the soil. B It makes an acid, making the soil acidic again. C It makes nitrogen gas, so less nitrogen is absorbed by the soil. D It makes the fertiliser too strong, stopping the plants growing well.

Which statement about sodium oxide or nitrogen dioxide is correct? A Nitrogen dioxide is a solid at room temperature. B Nitrogen dioxide is acidic. C Sodium oxide has a lower melting point than nitrogen dioxide. D Sodium oxide is covalently bonded.

A titration method is used to prepare a pure soluble sulfate salt from dilute sulfuric acid. What is the other reagent? A copper(II) oxide B magnesium C sodium hydroxide D zinc carbonate

Which row about elements in the Periodic Table is correct?

The table gives some information about three elements in Group I of the Periodic Table.

Which row identifies the melting point and the density of rubidium?

Which statement describes a transition element? A It is a dull grey metal that only forms white compounds. B It is a high-density metal with a high melting point that is used as a catalyst. C It is a low-density metal with a high melting point that reacts with steam to make hydrogen. D It is a soft, shiny silver metal that reacts vigorously with water.

The electronic configurations of helium, neon and argon are shown. Which row describes these gases?

X is a shiny silver-coloured solid at room temperature and pressure. X is a good conductor of heat and electricity when solid. Which statement about X is correct? A X is an ionic compound or a metallic element. B X is a metallic element or a non-metallic element. C X is an alloy or a metallic element. D X is an alloy or a non-metallic element.

Which elements can be combined to produce an alloy? 1 magnesium and aluminium 2 nitrogen and oxygen 3 iron and carbon 4 copper and zinc A 1, 3 and 4 B 1 and 2 C 2 and 3 D 4 only

Three metals, L, M and N, are added separately to dilute hydrochloric acid and cold water. The results are shown.

What is the order of reactivity of the metals?

Which reaction produces carbon dioxide? A cracking of large hydrocarbon molecules B photosynthesis C reaction of a base with a carbonate D thermal decomposition of calcium carbonate

A sample of air containing four gases only is analysed. $99.0\mathrm{\%}$ of the sample contains the two main gases in the same percentages as in clean, dry air. The remaining $1.0\mathrm{\%}$ of the sample contains argon and carbon dioxide. The gas that makes up $0.1\mathrm{\%}$ of the sample turns limewater milky. Which row shows the percentage composition of the sample of air?

Which substance contains two elements that are found in NPK fertilisers? A ammonium chloride B calcium hydroxide C potassium nitrate D sodium phosphate

Which statement about sulfur is correct? A When sulfur is burned, it produces a substance that causes acid rain. B Sulfur is produced by the thermal decomposition of limestone. C Compounds of sulfur make up approximately 1% of unpolluted air. D Sulfur is a member of the family of elements called halogens.

What are two adverse effects of particulates in the air? 1 acid rain 2 cancer 3 photochemical smog 4 respiratory problems A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Which formula represents a compound that is a member of the homologous series of alkanes? A ${\mathrm{C}}_2{\mathrm{H}}_4$ B ${\mathrm{C}}_3{\mathrm{H}}_6$ C ${\mathrm{C}}_4{\mathrm{H}}_8$ D ${\mathrm{C}}_5{\mathrm{H}}_{12}$

Which statement about ethane is correct? A It rapidly decolourises aqueous bromine. B It does not burn. C It forms long-chain compounds called polymers. D It only contains single bonds between its atoms.

Which raw material is used to make ethanol by fermentation? A carbon dioxide B ethene C glucose D natural gas

Which statement about ethanoic acid is correct? A It contains a –COOH group. B It has a pH greater than pH 7. C It reacts with sodium carbonate to form hydrogen gas. D It reacts with copper to form copper(II) ethanoate.

Which statement explains why the disposal of plastic waste leads to environmental problems? A Plastic waste forms toxic gases when it is burned. B Plastic waste contains many small molecules. C Plastic waste rapidly dissolves in the oceans. D Plastic waste reacts with both acids and bases.

Substance X and four known substances, P, Q, R and S, are analysed by chromatography. The chromatogram produced is shown. Which statement about X is correct? A It is a mixture of P, Q and S. B It contains P and S only. C It contains P, S and another unknown substance. D It is a mixture of Q, R and S.

Copper is insoluble in water. Copper(II) oxide is a solid that is insoluble in water but reacts with dilute hydrochloric acid. Which method is used to separate copper from a mixture of copper and copper(II) oxide? A dissolve the mixture in water then filter B dissolve the mixture in water then crystallise C react the mixture with dilute hydrochloric acid then filter D react the mixture with dilute hydrochloric acid then crystallise

A salt, S, is dissolved in water and three tests are carried out on the solution formed.

What is the identity of S? A copper(II) chloride B copper(II) sulfate C iron(II) chloride D iron(II) sulfate