IGCSE Chemistry 0620 Paper 13, Oct/Nov 2024

Which conditions cause gas particles to move the fastest and the furthest apart?

Which statement describes a liquid at room temperature? A A sample of a liquid has a fixed volume and shape. B A sample of a liquid does not have a fixed volume or shape. C The particles are touching but can move by sliding over each other. D The particles spread out and fill all available space.

A compound, X, has a melting point of $71{}^{\circ }\text{C}$ and a boiling point of $375{}^{\circ }\text{C}$. Which statement about X is correct? A It is a liquid at $52{}^{\circ }\text{C}$ and a gas at $175{}^{\circ }\text{C}$. B It is a liquid at $69{}^{\circ }\text{C}$ and a gas at $380{}^{\circ }\text{C}$. C It is a liquid at $75{}^{\circ }\text{C}$ and a gas at $350{}^{\circ }\text{C}$. D It is a liquid at $80{}^{\circ }\text{C}$ and a gas at $400{}^{\circ }\text{C}$.

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

An atom has three electron shells. There are three electrons in the outer shell. How many protons and how many neutrons are in this atom?

Which row gives the number of covalent bonds in one molecule of ammonia and in one molecule of hydrogen chloride?

Which statements about the structure and bonding in diamond are correct? 1 Each carbon atom in diamond is bonded to three other carbon atoms only. 2 Diamond contains many strong covalent bonds. 3 Diamond contains layers of carbon atoms, which can slide over each other. 4 Diamond has a giant structure. A 1, 2 and 3 B 2 and 3 only C 2 and 4 D 4 only

Magnesium burns in oxygen to form magnesium oxide. The equation for the reaction is shown. $$2\text{Mg}+{\text{O}}_2\to 2\text{MgO}$$ Which mass of magnesium oxide is formed when $48\text{ g}$ of magnesium is burned? A $20\text{ g}$ B $40\text{ g}$ C $80\text{ g}$ D $160\text{ g}$

Propane, ${\text{C}}_3{\text{H}}_8$, is burned in a limited amount of oxygen. Which equation represents this reaction? A ${\text{C}}_3{\text{H}}_8+5{\text{O}}_2\to 3{\text{CO}}_2+4{\text{H}}_2\text{O}$ B ${\text{C}}_3{\text{H}}_8+4{\text{O}}_2\to 3\text{CO}+4{\text{H}}_2\text{O}$ C ${\text{C}}_3{\text{H}}_8+4{\text{O}}_2\to 3{\text{CO}}_2+2{\text{H}}_2\text{O}+2{\text{H}}_2$ D $2{\text{C}}_3{\text{H}}_8+7{\text{O}}_2\to 6\text{CO}+8{\text{H}}_2\text{O}$

The isotope of which element is used to define the relative atomic mass of other elements? A sulfur B oxygen C nitrogen D carbon

What is the definition of electrolysis? A the formation of a positive ion by the removal of electrons using an electric current B the decomposition of an ionic compound, when molten or in aqueous solution, by the passage of an electric current C the substance containing ions through which an electric current can pass D the coating of a metal with a different metal by passing an electric current through an aqueous solution of an ionic salt

Which statement about electroplating a copper spoon with silver is correct? A Both the anode and cathode are made of carbon. B The copper spoon is the anode. C Aqueous copper(II) sulfate is the electrolyte. D Silver is formed at the negative electrode.

Which row describes the reaction pathway diagram and energy change in an exothermic reaction?

The table shows the initial and final temperatures for four different reactions.

Which reactions are endothermic? A 1 and 4 B 2 and 3 C 2 only D 4 only

Which process is a chemical change? A boiling water B cooking an egg C dissolving sugar D melting ice cubes

A student reacts strips of zinc with dilute sulfuric acid and measures the time taken to produce $100{\text{ cm}}^3$ of hydrogen. The experiment is repeated using different conditions. The results are shown in the table.

Which changes in conditions produce the results shown in experiment 2? 1 Add a catalyst. 2 Dilute the acid. 3 Use zinc powder. 4 Heat the acid. A 1, 3 and 4 B 1 and 4 only C 2 and 3 D 2 and 4

When blue copper(II) sulfate is heated, a white solid and water are formed. The white solid turns blue and gives out heat when water is added to it. Which terms describe the blue copper(II) sulfate and the reactions?

Which statements about a redox reaction are correct? 1 Oxidation is the gain of oxygen. 2 Both oxidation and reduction take place in a redox reaction. 3 Reduction is the gain of oxygen. A 1 and 2 B 1 only C 2 and 3 D 3 only

Which row identifies a basic oxide and describes an alkali?

Which indicators turn blue when added to aqueous ammonia? 1 litmus 2 thymolphthalein 3 universal indicator A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Ammonium chloride reacts with solution X to produce alkaline gas Y. The equation is shown. $$\text{ammonium chloride}+\text{solution X}\to \text{alkaline gas Y}$$ Which row identifies X and Y?

The solubility of some salts is shown.

Which two aqueous solutions produce an insoluble salt when mixed together? A barium chloride and zinc nitrate B barium nitrate and lead(II) nitrate C lead(II) nitrate and potassium carbonate D potassium nitrate and zinc sulfate

The table shows some properties of the halogens.

Which statement describes astatine? A It is a yellow gas at room temperature. B It is a black liquid at room temperature. C Its melting point is higher than the melting point of bromine but lower than that of chlorine. D Its melting point is higher than the melting point of both iodine and bromine.

J, L and M are elements in the Periodic Table. ● J has the highest density. ● L has the highest reactivity with water. ● M has the highest atomic number. Which row identifies the elements J, L and M?

Which statement about elements in Group I of the Periodic Table is correct? A Rubidium has a greater density than caesium. B Lithium has a higher melting point than potassium. C Potassium is more reactive than rubidium. D Rubidium atoms have more outer shell electrons than sodium atoms.

Which diagram shows a mixture of noble gases? A B C D

Which statements about the alloy brass are correct? 1 It is harder than pure copper. 2 It does not conduct electricity. 3 It is a mixture of copper and nickel. 4 It is stronger than pure copper. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

The bodies of aircraft are often made using aluminium. Which two properties of aluminium make it suitable for this use?

Four metals, P, Q, R and S, are added separately to water and to dilute hydrochloric acid. The table shows the results.

Which conclusion can be made from these observations? A P is the least reactive of the four metals. B Q is more reactive than S. C Q is less reactive than P. D R is the most reactive of the four metals.

Iron is extracted from its ore in the blast furnace. Which statement about one of the reactions in the blast furnace is correct? A Carbon monoxide is reduced to carbon dioxide. B Iron(III) oxide is reduced by carbon dioxide. C Slag is produced when calcium carbonate reacts with carbon dioxide. D The reaction that heats the blast furnace produces carbon dioxide.

Which pollutants found in river water lead to deoxygenation? 1 nitrates 2 harmful microbes 3 metal compounds 4 phosphates A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Three effects of air pollutants are listed. 1 photochemical smog 2 respiratory problems 3 acid rain Which effects are caused by oxides of nitrogen? A 1, 2 and 3 B 1 and 3 only C 1 only D 2 and 3 only

Fractional distillation is used to separate petroleum into its fractions. Which statement about the fractional distillation of petroleum is correct? A The kerosene fraction is used as a fuel for ships. B The fractions with the highest boiling points are extracted from the top of the fractionating column. C The naphtha fraction contains larger hydrocarbon molecules than the lubricating oil fraction. D The refinery gas fraction contains hydrocarbon molecules which consist of five atoms.

Fertilisers are mixtures of different compounds used to increase the growth of crops. Which pair of substances contain the three essential elements for plant growth? A ammonium nitrate and calcium phosphate B ammonium nitrate and potassium chloride C ammonium phosphate and potassium chloride D potassium nitrate and calcium carbonate

Which row gives the relative molecular mass, $M_{\text{r}}$, of the first member of the named homologous series?

A hydrocarbon decolourises bromine water. Which statement about the hydrocarbon is correct? A It is an alkane. B Its molecular formula is ${\text{C}}_2{\text{H}}_6$. C It is a saturated hydrocarbon. D It has the general formula ${\text{C}}_n{\text{H}}_{2n}$.

Which statement describes how ethanol is manufactured from ethene? A Steam is added to ethene using an acid catalyst at $30{}^{\circ }\text{C}$. B Steam is added to ethene using an acid catalyst at $300{}^{\circ }\text{C}$. C Ethene is fermented using yeast at $30{}^{\circ }\text{C}$. D Ethene is fermented using yeast at $300{}^{\circ }\text{C}$.

Ethanoic acid reacts with aqueous sodium carbonate. Which gas is given off in this reaction? A hydrogen B carbon dioxide C carbon monoxide D oxygen

A mixture containing an aqueous salt, sand and hot water is stirred. The mixture is then poured into the apparatus shown. What is X? A a filtrate only B a residue only C a solute only D a solvent only

A scientist uses a titration to calculate the concentration of acid in a sample of lemon juice. A measured volume of aqueous lemon juice and a few drops of an indicator are added to a flask. The aqueous lemon juice is then titrated against $0.1\text{ mol}\mathrm{/}{\text{dm}}^3$ aqueous sodium hydroxide. Which piece of apparatus is used to add the aqueous sodium hydroxide to the flask? A a burette B a delivery tube C a measuring cylinder D a volumetric pipette