IGCSE Chemistry 0620 Paper 12, Oct/Nov 2024

The table shows some information about the three states of matter.

Which row is correct?

Which arrow represents evaporation? $$\text{solid}\underset{\text{C}}{\overset{\text{A}}{\rightleftharpoons }}\text{liquid}\underset{\text{D}}{\overset{\text{B}}{\rightleftharpoons }}\text{gas}$$

In which states of matter does diffusion occur readily? A gases and liquids B gases only C liquids and solids D solids only

Which statement about the boxes P, Q and R is correct? A Box P contains two compounds, and box R contains two elements. B Box P contains two elements, and box Q contains a mixture. C Box P contains two elements, and box Q contains one compound. D Box Q contains two compounds, and box R contains a mixture.

Which information about an element is given by its atomic number? A the number of protons in the nucleus of an atom of an element B the number of particles in the nucleus of an atom of an element C the relative mass of one atom of an element D the total number of particles in one atom of an element

The symbols represent four atoms. The letters used are not the usual atomic symbols. $${}_{20}^{40}\text{W}{}_{19}^{40}\text{X}{}_{20}^{46}\text{Y}{}_{22}^{46}\text{Z}$$ Which atoms are isotopes of the same element? A W and X B W and Y C X and Y D Y and Z

Covalent bonds are formed when electrons are ......1...... . Most covalent compounds have ......2...... electrical conductivity. Which words correctly complete gaps 1 and 2?

Which row describes the structure and a use of diamond?

Which symbol equation represents the reaction between aqueous sodium hydroxide and dilute sulfuric acid? A ${\text{Na}}_2\text{OH}+{\text{H}}_2{\text{SO}}_4\to 2{\text{NaSO}}_4+{\text{H}}_2\text{O}$ B ${\text{Na(OH)}}_2+{\text{H}}_2{\text{SO}}_4\to {\text{Na}}_2{\text{SO}}_4+2{\text{H}}_2\text{O}$ C $2\text{NaOH}+{\text{H}}_2{\text{SO}}_4\to 2{\text{NaSO}}_4+2{\text{H}}_2\text{O}$ D $2\text{NaOH}+{\text{H}}_2{\text{SO}}_4\to {\text{Na}}_2{\text{SO}}_4+2{\text{H}}_2\text{O}$

What is the relative formula mass of magnesium bromide? A 47 B 82 C 104 D 184

Three substances are listed. 1 solid copper 2 aqueous sodium bromide 3 solid lead(II) bromide Which substances conduct electricity? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Hydrogen–oxygen fuel cells can be used to power cars. Which processes produce the fuel of a hydrogen–oxygen fuel cell? 1 the cracking of hydrocarbons 2 the electrolysis of dilute sulfuric acid 3 photosynthesis 4 the electrolysis of molten aluminium oxide A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Molten sodium sulfide, ${\text{Na}}_2\text{S}$, is electrolysed using inert electrodes. Which row identifies the product at each electrode?

The temperature of the water in two beakers, X and Y, is measured as $21.5{}^{\circ }\text{C}$. $5\text{ g}$ of sodium chloride is dissolved in the water in beaker X. The temperature changes to $18.0{}^{\circ }\text{C}$. $5\text{ g}$ of calcium oxide is dissolved in the water in beaker Y. The temperature changes to $29.4{}^{\circ }\text{C}$. Which types of process are occurring in beakers X and Y?

Which process involves a chemical change? A adding sodium chloride to water B adding magnesium to hydrochloric acid C heating solid iodine until it turns into a gas D melting lead

Which two pieces of apparatus are most useful to measure the rate of a reaction in which a gas is given off? A accurate balance and gas syringe B accurate balance and thermometer C gas syringe and stop-watch D stop-watch and thermometer

Reaction 1 and reaction 2 both produce a gas. The total volume of gas produced in each reaction is measured every minute for 10 minutes. A graph of the results is shown. Which row describes how the rate of reaction changes, if at all, during each reaction?

When a few drops of water are added to a solid, E, the colour changes from blue to pink. What is E? A anhydrous cobalt(II) chloride B anhydrous copper(II) sulfate C hydrated cobalt(II) chloride D hydrated copper(II) sulfate

The equation for the reaction of magnesium with copper(II) oxide is shown. $$\text{Mg}+\text{CuO}\to \text{MgO}+\text{Cu}$$ Which word describes this reaction? A combustion B decomposition C neutralisation D redox

Compound M contains calcium. Two reactions of M are listed. ● M reacts with dilute hydrochloric acid to form a salt and water only. ● M reacts with aqueous ammonium chloride to form a gas that turns damp red litmus paper blue. What is M? A $\text{CaOH}$ B ${\text{Ca(OH)}}_2$ C ${\text{CaCO}}_3$ D ${\text{Ca(CO}}_3{)}_2$

The diagram shows one period of the Periodic Table.

Which two elements form acidic oxides? A beryllium and lithium B carbon and neon C carbon and nitrogen D nitrogen and neon

A student tests four solutions with universal indicator. Which colour identifies the solution containing the greatest concentration of ${\text{OH}}^{-}$ ions? A red B yellow C green D blue

The following steps are done to prepare solid magnesium sulfate. 1 filtration 2 measurement of $20{\text{ cm}}^3$ of dilute sulfuric acid using a measuring cylinder 3 evaporation 4 addition of an excess of solid magnesium carbonate to dilute sulfuric acid What is the correct order for these steps? A $2\to 4\to 3\to 1$ B $2\to 4\to 1\to 3$ C $4\to 2\to 1\to 3$ D $4\to 2\to 3\to 1$

Which statement about the Periodic Table is correct? A All the metals in the Periodic Table are transition elements. B The halogens are elements in Group I of the Periodic Table. C The elements become more metallic across a period from Group I to Group VII. D The Periodic Table can be used to predict the properties of the elements.

Zinc is formed when zinc oxide is heated with carbon. $$\text{zinc oxide}+\text{carbon}\to \text{zinc}+\text{carbon monoxide}$$ Which substance is oxidised in this reaction? A carbon B carbon monoxide C zinc D zinc oxide

Which word equation represents the rusting of iron? A $\text{iron}+\text{oxygen}+\text{water}\to \text{anhydrous iron(II) hydroxide}$ B $\text{iron}+\text{oxygen}\to \text{hydrated iron(II) oxide}$ C $\text{iron}+\text{oxygen}+\text{water}\to \text{anhydrous iron(III) hydroxide}$ D $\text{iron}+\text{oxygen}+\text{water}\to \text{hydrated iron(III) oxide}$

Which option describes the electronic configurations of three different elements from the same group of the Periodic Table? A 2 2,2 2,8,8,2 B 2 2,8 2,8,2 C 2,1 2,8,1 2,8,8,1 D 2,1 2,2 2,3

Which metal forms compounds that can be used to colour glass? A aluminium B calcium C chromium D sodium

Two properties of element R are listed. ● It is a dark solid at room temperature. ● It is a diatomic molecule. Where on the Periodic Table is R placed? A Group I B Group VII C Group VIII D transition elements

Four metals, W, X, Y and Z, are tested with either cold water, steam or both. The observations are shown.

What is the order of reactivity of the metals from the least reactive to the most reactive?

Which statement about the displacement reactions of the halogens is correct? A Iodine displaces bromine from aqueous sodium bromide. B Bromine displaces chlorine from aqueous potassium chloride. C Iodine displaces chlorine from aqueous potassium chloride. D Chlorine displaces bromine from aqueous sodium bromide.

Which substances in water from natural sources are beneficial to aquatic animals? 1 metal compounds 2 plastics 3 phosphates 4 dissolved oxygen A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

What are the products formed when glucose is fermented? A ethanol and carbon dioxide B ethanol and oxygen C ethene and carbon dioxide D ethene and oxygen

Which structure represents a molecule of ethanol?

Which statement describes a homologous series? A a family of elements in the same group of the Periodic Table B a family of elements with similar chemical properties C a family of compounds with the same functional group D a family of compounds with similar physical properties

What are the properties of aqueous ethanoic acid?

Four different organic compounds are separated by a fractionating column. The table shows the boiling points of the compounds.

The diagram shows the position in the fractionating column where they are separated. Which row identifies the compound in each fraction?

Which piece of apparatus is used to measure exactly $21.50{\text{ cm}}^3$ of dilute sulfuric acid? A beaker B burette C measuring cylinder D volumetric pipette

Which row shows an advantage and a disadvantage for the stated apparatus used in a titration?

Sample M contains calcium carbonate and sodium nitrate. The result of adding water to M, stirring and filtering is shown. No chemical reaction occurs. Which terms describe M, calcium carbonate and aqueous sodium nitrate?