IGCSE Chemistry 0620 Paper 11, May/June 2023

The diagram shows the result of dropping a purple crystal into water. Which processes take place in this experiment? A chemical reaction [✓] diffusing [✓] dissolving [✗] B chemical reaction [✓] diffusing [✗] dissolving [✗] C chemical reaction [✗] diffusing [✗] dissolving [✓] D chemical reaction [✗] diffusing [✓] dissolving [✓]

Which row about elements, mixtures and compounds is correct? A metallic element: copper, non-metallic element: methane, mixture: brass, compound: sulfur B metallic element: brass, non-metallic element: sulfur, mixture: copper, compound: methane C metallic element: copper, non-metallic element: sulfur, mixture: brass, compound: methane D metallic element: brass, non-metallic element: methane, mixture: copper, compound: sulfur

What are the relative charge and relative mass of an electron? A relative charge: 0, relative mass: 1 B relative charge: 0, relative mass: $\frac{1}{2000}$ C relative charge: -1, relative mass: 1 D relative charge: -1, relative mass: $\frac{1}{2000}$

The atomic structures of four particles, W, X, Y and Z, are shown. Which particles are isotopes of the same element? A W and X B W and Y C X and Y D X and Z

Which row shows the properties of an ionic compound? A electrical conductivity of solid: good, melting point / °C: 98 B electrical conductivity of solid: good, melting point / °C: 3652 C electrical conductivity of solid: poor, melting point / °C: 78 D electrical conductivity of solid: poor, melting point / °C: 801

Which row describes the formation of single covalent bonds in methane? A atoms share a pair of electrons | both atoms gain a noble gas electronic structure B atoms share a pair of electrons | both atoms have the same number of electrons in their outer shell C electrons are transferred from one atom to another | both atoms gain a noble gas electronic structure D electrons are transferred from one atom to another | both atoms have the same number of electrons in their outer shell

Which equation represents the neutralisation of nitric acid using sodium hydroxide? A $\text{NaOH(aq)}+{\text{HNO}}_3\text{(aq)}\to {\text{NaNO}}_3\text{(aq)}+{\text{H}}_2\text{O(l)}$ B $\text{NaOH(aq)}+{\text{HNO}}_3\text{(aq)}\to {\text{NaNO}}_3\text{(l)}+{\text{H}}_2\text{O(l)}$ C $\text{NaOH(l)}+{\text{HNO}}_3\text{(l)}\to {\text{NaNO}}_3\text{(l)}+{\text{H}}_2\text{O(aq)}$ D $\text{NaOH(l)}+{\text{HNO}}_3\text{(l)}\to {\text{NaNO}}_3\text{(l)}+{\text{H}}_2\text{O(l)}$

What is the relative formula mass of ammonium nitrate, ${\text{NH}}_4{\text{NO}}_3$? A 80 B 108 C 122 D 150

Concentrated aqueous sodium chloride is electrolysed using inert electrodes. Gases X and Y are produced at the electrodes shown. What are X and Y? A X: chlorine, Y: hydrogen B X: hydrogen, Y: chlorine C X: hydrogen, Y: oxygen D X: oxygen, Y: hydrogen

Which statement about hydrogen fuel cells is correct? A Hydrogen fuel cells do not produce carbon dioxide. B Hydrogen fuel cells do not need oxygen. C The waste from a hydrogen fuel cell is an acidic gas. D The reaction in a fuel cell is endothermic.

A reaction pathway diagram is shown. Which statement about this reaction is correct? A The reaction rate increases during the reaction. B The reaction is endothermic. C The reaction transfers thermal energy to the surroundings. D The temperature of the surroundings increases.

Lumps of calcium carbonate react with dilute hydrochloric acid as shown. $${\text{CaCO}}_3+2\text{HCl}\to {\text{CaCl}}_2+{\text{H}}_2\text{O}+{\text{CO}}_2$$ Which change in conditions decreases the rate of the reaction? A increasing the concentration of the acid B increasing the volume of the acid C increasing the size of the lumps of calcium carbonate D increasing the temperature

Solid copper(II) sulfate exists in two different forms, anhydrous and hydrated. One of these forms is blue and the other is white. The change between these two forms is reversible. $$\text{blue form}\rightleftharpoons \text{white form}$$ What is the blue form and how is the change from the blue form to the white form brought about? A blue form: anhydrous, change to white form: add water B blue form: anhydrous, change to white form: heat C blue form: hydrated, change to white form: add water D blue form: hydrated, change to white form: heat

Four redox equations and statements about the equations are shown. 1 $\text{C}+{\text{O}}_2\to {\text{CO}}_2$ | carbon is oxidised 2 ${\text{CO}}_2+\text{C}\to 2\text{CO}$ | carbon dioxide is oxidised 3 ${\text{CO}}_2+\text{C}\to 2\text{CO}$ | carbon is oxidised 4 ${\text{Fe}}_2{\text{O}}_3+3\text{CO}\to 2\text{Fe}+3{\text{CO}}_2$ | iron(III) oxide is oxidised Which statements about the equations are correct? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Sodium hydroxide forms an alkaline solution with a pH of 14. Which indicator turns yellow when added to this solution? A litmus B methyl orange C thymolphthalein D universal indicator

Which row identifies an acidic oxide and a basic oxide? A acidic oxide: CaO, basic oxide: CuO B acidic oxide: CaO, basic oxide: ${\text{SO}}_2$ C acidic oxide: ${\text{CO}}_2$, basic oxide: CuO D acidic oxide: ${\text{CO}}_2$, basic oxide: ${\text{SO}}_2$

A student makes aqueous copper(II) chloride by adding excess copper(II) carbonate to dilute hydrochloric acid. What is the next step in the method in the formation of solid copper(II) chloride? A crystallisation B evaporation C filtration D titration

Which statements about the trends across a period of the Periodic Table are correct? 1 Aluminium is more metallic than sodium. 2 Beryllium is more metallic than carbon. 3 Boron is more metallic than lithium. 4 Magnesium is more metallic than silicon. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Which row shows the trend in melting point, density and reactivity as Group I is descended? A melting point: increases, density: decreases, reactivity: decreases B melting point: decreases, density: increases, reactivity: increases C melting point: increases, density: decreases, reactivity: increases D melting point: decreases, density: increases, reactivity: decreases

Which row describes a similarity and a difference between chlorine and bromine? A similarity: both are gases at room temperature and pressure | difference: chlorine and bromine have different colours B similarity: both exist as diatomic molecules | difference: chlorine is more dense than bromine C similarity: both have atoms with seven outer-shell electrons | difference: only bromine will react with aqueous sodium chloride D similarity: both react with aqueous potassium iodide | difference: chlorine is more reactive than bromine

Which statement describes transition elements? A They have high densities and high melting points. B They have high densities and low melting points. C They have low densities and high melting points. D They have low densities and low melting points.

Which diagram shows the electronic structure of a noble gas? A B C D

Which gas is made when powdered zinc is added to dilute hydrochloric acid? A carbon dioxide B chlorine C hydrogen D oxygen

Which metal is used in aircraft manufacture because it has a low density? A aluminium B copper C iron D potassium

The diagram represents the structure of a solid. Which solids does the diagram represent? A brass: ✓, graphite: ✓, sodium chloride: ✗ B brass: ✓, graphite: ✗, sodium chloride: ✗ C brass: ✗, graphite: ✓, sodium chloride: ✓ D brass: ✗, graphite: ✗, sodium chloride: ✓

Three students, X, Y and Z, are told that solid P reacts with dilute acids and also conducts electricity. The table shows the students' suggestions about the identity of P. X: copper, Y: iron, Z: graphite Which students are correct? A X, Y and Z B X only C Y only D Z only

Which substances in the air are needed for iron to rust? A oxygen and water B oxygen only C water and carbon dioxide D water only

Part of the reactivity series of metals is shown. metal P carbon metal Q metal R (decreasing reactivity) Which row shows how each metal is extracted from its ore? A metal P: electrolysis of molten ore, metal Q: electrolysis of molten ore, metal R: heating with carbon B metal P: heating with carbon, metal Q: electrolysis of molten ore, metal R: electrolysis of molten ore C metal P: heating with carbon, metal Q: heating with carbon, metal R: electrolysis of molten ore D metal P: electrolysis of molten ore, metal Q: heating with carbon, metal R: heating with carbon

Several processes are used to treat domestic water. Which row identifies a reason for the given process? A process: chlorination, reason: removes impurities B process: filtration, reason: removes insoluble solids C process: sedimentation, reason: removes soluble solids D process: use of carbon, reason: kills bacteria

Which pair of compounds make an NPK fertiliser? A ammonium sulfate and potassium phosphate B calcium hydroxide and ammonium nitrate C calcium phosphate and potassium chloride D potassium nitrate and ammonium sulfate

Some information about gas X is listed. ● It is not present in clean, dry air. ● It is not a cause of respiratory problems. ● It is responsible for global warming. What is X? A carbon dioxide B carbon monoxide C methane D nitrogen dioxide

Part of the structure of a molecule of vitamin A is shown. Which statements about this part of the structure are correct? 1 It is saturated. 2 There are two alkene groups. 3 The structure shows a carboxylic acid. A 1 and 3 B 1 only C 2 and 3 D 2 only

The fractional distillation of petroleum is shown. Which fraction contains hydrocarbons with the longest chain length? A B C D

Which equation represents the cracking of an alkane? A $3{\text{C}}_2{\text{H}}_4\to {\text{C}}_6{\text{H}}_{12}$ B ${\text{C}}_6{\text{H}}_{12}+{\text{H}}_2\to {\text{C}}_6{\text{H}}_{14}$ C ${\text{C}}_6{\text{H}}_{14}\to 6\text{C}+7{\text{H}}_2$ D ${\text{C}}_6{\text{H}}_{14}\to {\text{C}}_2{\text{H}}_4+{\text{C}}_4{\text{H}}_{10}$

Which statements about ethanol are correct? 1 Ethanol is made by reacting steam with ethene at 300 °C. 2 Ethanol is made by fermentation at 55 °C. 3 Ethanol burns to produce carbon dioxide and water. 4 Ethanol contains a carbon–carbon double bond. A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4

Which substances react with aqueous ethanoic acid to form a gas? 1 magnesium 2 magnesium carbonate 3 magnesium oxide A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

In reaction R, 2000 molecules of ${\text{CH}}_2={\text{CH}}_2$ react to form a single molecule X only. $$2000{\text{CH}}_2={\text{CH}}_2\to \text{X}$$ Which terms describe reaction R, ${\text{CH}}_2={\text{CH}}_2$ and X? A reaction R: addition, ${\text{CH}}_2={\text{CH}}_2$: monomer, X: polymer B reaction R: addition, ${\text{CH}}_2={\text{CH}}_2$: polymer, X: monomer C reaction R: substitution, ${\text{CH}}_2={\text{CH}}_2$: monomer, X: polymer D reaction R: substitution, ${\text{CH}}_2={\text{CH}}_2$: polymer, X: monomer

The concentration of acids and alkalis can be determined by titration. Which pieces of equipment are needed to perform a titration? A 1 and 2 B 1 and 3 C 2 and 3 D 2 and 4

Which process is used to produce drinking water from sea water? A crystallisation B distillation C filtration D chlorination

The results of two separate tests on a white solid X are shown. add dilute nitric acid: effervescence add aqueous sodium hydroxide and warm: a gas is formed which turns damp red litmus paper blue What is X? A aluminium carbonate B aluminium nitrate C ammonium carbonate D ammonium nitrate