IGCSE Chemistry 0620 Paper 11, May/June 2025

Which process happens when water vapour changes to rain? A boiling B condensing C evaporating D freezing

The diagrams show the arrangement of particles in three different states of matter. state 1 state 2 state 3 Which row describes the change in energy of the particles and in particle motion for the given change in state?

An atom of element Q contains 19 electrons, 19 protons and 20 neutrons. What is Q? A calcium B potassium C strontium D yttrium

Which part of an atom has a relative mass of 1 and a relative charge of 0? A electron B neutron C nucleus D proton

Which row identifies the number of electrons, neutrons and protons in a particle which is an isotope of ${}_5^{11}\text{B}$?

Which statements about potassium iodide are correct? 1 It is formed from potassium anions and iodide cations. 2 It is a good electrical conductor when molten or in aqueous solution. 3 Potassium atoms share electrons with iodine atoms. A 1 and 3 B 1 only C 2 and 3 D 2 only

Which substances contain one or more shared pairs of electrons? 1 argon 2 methane 3 iron(III) oxide 4 chlorine A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Which substance has a giant covalent structure at room temperature and pressure? A ammonia B carbon dioxide C diamond D water

Which row shows the correct formula for the named substance?

The equation shows the thermal decomposition of magnesium carbonate. $${\text{MgCO}}_3\to \text{MgO}+{\text{CO}}_2$$ [$M_r$: ${\text{MgCO}}_3$, 84] Which mass of magnesium oxide is formed when $21.0\text{ g}$ of magnesium carbonate is completely decomposed? A $1.9\text{ g}$ B $4.0\text{ g}$ C $10.0\text{ g}$ D $40.0\text{ g}$

Concentrated aqueous sodium chloride is electrolysed using inert electrodes. What is the main product formed at the positive electrode (anode)? A chlorine B hydrogen C oxygen D sodium

A hydrogen–oxygen fuel cell uses $630{\text{ dm}}^3$ of oxygen. The oxygen for the reaction is extracted from clean, dry air. What is the minimum volume of clean, dry air needed to provide this volume of oxygen? A $788{\text{ dm}}^3$ B $808{\text{ dm}}^3$ C $3000{\text{ dm}}^3$ D $3316{\text{ dm}}^3$

Three statements about energy changes in chemical reactions are listed. 1 In an endothermic reaction, the temperature of the surroundings increases. 2 In an exothermic reaction, thermal energy is taken in from the surroundings. 3 In the reaction pathway diagram for an exothermic reaction, the energy level of the products is lower than the energy level of the reactants. Which statements are correct? A 1 and 2 B 1 only C 2 and 3 D 3 only

When a small piece of a Group I metal is placed into a large beaker of cold water, a reaction occurs. Four statements about this reaction are listed. 1 The metal melts. 2 Hydrogen is produced. 3 Steam is produced. 4 The pH of the solution increases. Which statements about this reaction describe a physical change? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

The equation for the decomposition of hydrogen peroxide is shown. $$2{\text{H}}_2{\text{O}}_2\to 2{\text{H}}_2\text{O}+{\text{O}}_2$$ The reaction is exothermic. When a small amount of a catalyst is added, the oxygen is produced more quickly. Which statement about the catalyst is correct? A The catalyst makes the reaction more exothermic. B The mass of catalyst is the same before and after the reaction. C The catalyst increases the final volume of oxygen produced. D All of the catalyst is used up in the reaction.

The equation for the reaction between copper(II) oxide and carbon is shown. $$2\text{CuO}+\text{C}\to 2\text{Cu}+{\text{CO}}_2$$ Which statement about this reaction is correct? A CuO is reduced. B ${\text{CO}}_2$ is oxidised. C Cu is oxidised. D C is reduced.

Which row gives the colours observed when thymolphthalein and methyl orange are added separately to the named solution?

A mixture of two substances, R and S, is heated gently. The damp red litmus paper turns blue. What are R and S?

Which reactants are used to make the salt copper(II) sulfate? A dilute acid + alkali B dilute acid + metal carbonate C dilute acid + metal D dilute acid + non-metal oxide

Which statement about the Periodic Table is correct? A The elements are arranged in order of increasing relative atomic mass. B The reactivity of the elements in Group I and in Group VII increases as the groups are descended. C Elements in the same period have similar chemical properties. D Elements in Group II form ions with a 2+ charge.

Part of the Periodic Table is shown. Which element shows the most metallic character?

E is an element from Group I of the Periodic Table. Two properties of E are listed. ● It has a higher melting point than caesium. ● It has a lower density than sodium. What is the identity of E? A lithium B potassium C rubidium D francium

An equation for the displacement reaction between aqueous halogen, ${\text{X}}_2$, and aqueous halide ions, ${\text{Y}}^{-}$, is shown. $${\text{X}}_2\text{(aq)}+2{\text{Y}}^{-}\text{(aq)}\to 2{\text{X}}^{-}\text{(aq)}+{\text{Y}}_2\text{(aq)}$$ Which row identifies ${\text{X}}_2$ and ${\text{Y}}^{-}$ and explains why the reaction takes place?

Some information about an element is shown.

What is the position of this element in the Periodic Table? A Group I B Group VII C Group VIII D transition elements

The table shows the observations when four metals, Q, R, S and T, are added separately to cold water and to dilute hydrochloric acid.

Which row gives the order of reactivity of the metals?

Magnesium is reacted separately with dilute sulfuric acid and with steam. Which row correctly identifies if hydrogen is formed as a product in each reaction?

key $\mathrm{✓}=\text{hydrogen is formed}$ $\text{X}=\text{hydrogen is not formed}$

Which statements about aluminium are correct? 1 It is more reactive than calcium. 2 The main ore of aluminium is bauxite. 3 It can be extracted from its oxide using carbon. 4 Brass is an alloy of aluminium and copper. A 1 and 2 B 1 and 3 C 2 only D 3 and 4

Steel is a mixture of iron and one or more other elements. The table gives some information about three common types of steel.

Which rows identify a type of steel that is suitable to make cutlery? A 1 and 2 B 1 only C 2 and 3 D 3 only

The diagram shows an experiment to investigate the corrosion of iron. What happens to the water level in tubes P and Q?

Fertilisers are used to provide the three elements needed for improved plant growth. Which two compounds would provide all three of these elements? A ammonium nitrate and calcium phosphate B ammonium nitrate and potassium sulfate C potassium nitrate and calcium phosphate D potassium phosphate and potassium sulfate

Which substances can be used to detect the presence of water? 1 anhydrous cobalt(II) chloride 2 anhydrous copper(II) sulfate 3 litmus 4 methyl orange A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

What is produced by the incomplete combustion of methane? A carbon monoxide B hydrogen C lead compounds D sulfur dioxide

Which row identifies compounds in the same homologous series?

The molecular formula of compound Z is ${\text{C}}_4{\text{H}}_{10}$. Which row identifies the substance that reacts with Z and describes the type of reaction that occurs?

Which list shows the fractions obtained from the fractional distillation of petroleum, in order of increasing boiling point? A $\text{bitumen}\to \text{diesel oil}\to \text{fuel oil}\to \text{lubricating oil}$ B $\text{diesel oil}\to \text{gasoline}\to \text{naphtha}\to \text{kerosene}$ C $\text{gasoline}\to \text{naphtha}\to \text{kerosene}\to \text{diesel oil}$ D $\text{kerosene}\to \text{lubricating oil}\to \text{naphtha}\to \text{refinery gas}$

Three statements about cracking of larger alkane molecules are listed. 1 Cracking produces petrol for cars. 2 Cracking only produces short-chain alkenes. 3 Cracking produces alkenes used to make polymers. Which statements are correct? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Some words used to describe organic compounds are listed. 1 hydrocarbon 2 monomer 3 saturated 4 unreactive Which words describe ethene? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

A student measures $25.00{\text{ cm}}^3$ of dilute hydrochloric acid accurately. Which piece of apparatus is most suitable? A beaker B measuring cylinder C burette D dropping pipette

Excess solid magnesium oxide is added to dilute nitric acid. Which separation technique is used to remove the excess solid magnesium oxide after the reaction finishes? A chromatography B crystallisation C distillation D filtration

Four different aqueous metal nitrates are tested separately with aqueous sodium hydroxide, with dilute sulfuric acid and with a flame test. Which row shows the correct set of results for the named aqueous metal nitrate?