Cambridge & Pearson Edexcel Past Paper Questions

The letters X, Y and Z represent different atoms. 40 X 19 39 Y 19 40 Z 20 Which statement is correct?

A student makes three statements. 1 Calcium ions have a 2+ charge and oxide ions have a 2- charge. 2 Magnesium ions and oxide ions have the same el...

Four statements about graphite, diamond and silicon(IV) oxide are listed. 1 Diamond and silicon(IV) oxide are both very hard and have similar struc...

Which row is correct? compound, molecular formula

Compound Y is the only substance formed when 500 cm³ of ammonia reacts with 250 cm³ of carbon dioxide. All measurements are at r.t.p. What is the f...

How many sodium ions are there in 30 g of sodium sulfate?

Three compounds are listed. copper(II) nitrate, Cu(NO3)2 zinc sulfate, ZnSO4 sodium thiosulfate, Na2S2O3 Which row shows the element that is presen...

The complete combustion of 20 cm³ of a gaseous alkane, X, requires 130 cm³ of oxygen. Both volumes are measured at r.t.p. What could be the identit...

Aqueous copper(II) sulfate is electrolysed with copper electrodes. What is the equation for the reaction occurring at the anode?

Three statements about fuel cells are given. 1 A hydrogen-oxygen fuel cell requires a continuous input of fuel and oxygen. 2 In a hydrogen-oxygen f...

Under certain conditions, nitrogen reacts with oxygen to form N2O. 2N2(g) + O2(g) ⇋ 2N2O(g) The reaction pathway diagram is shown. What is the acti...

Hydrogen and bromine react to form hydrogen bromide. H2 + Br2 → 2HBr Bond energy data is given in the table. bond, bond energy in kJ/mol H-H, 436 B...

Octane, C8H18, is a hydrocarbon. When octane is mixed with an excess of oxygen, no change takes place unless energy is supplied. If energy is suppl...

A student plans to investigate how the rate of the reaction changes when hydrochloric acid and calcium carbonate react. CaCO3(s) + 2HCl(aq) → CaCl2...

Aqueous bromine is an equilibrium mixture. Br2(aq) + H2O(l) ⇋ OBr¯(aq) + Br¯(aq) + 2H+(aq) Aqueous bromine is orange in colour. The species on the ...

In which substance does the nitrogen atom have the same oxidation number as the nitrogen atom in HNO2? Assume the following oxidation numbers for t...

Limewater is aqueous calcium hydroxide. Which statement about limewater is correct?

Which two oxides will both react with aqueous sodium hydroxide?

A solution of sodium carbonate is added to tap water. A white precipitate forms. Which ion present in the tap water causes the precipitate to form?

The characteristic properties of elements change from left to right across Period 2 of the Periodic Table. On the left of the period, the charge on...

Which statement about the Group VII halogens is correct?

A power cable requires an element that: 1 conducts electricity 2 has a relatively low density 3 is ductile. Which of these properties does aluminiu...

Which diagram represents the structure of an alloy?

Most metals react with oxygen in the air to form a metal oxide. Which metal forms a metal oxide layer that reduces its apparent reactivity?

Which statement about corrosion of metals is correct?

Some metals and the compounds in their ores are shown. metal, Al, Ca, Pb, Na, Fe, Mg compound in ore, Al2O3, CaCO3, PbS, NaCl, Fe2O3, MgCO3 Which t...

Which statement about natural sources of water and the domestic water supply is correct?

Gases that may be present in the air are listed. 1 neon 2 carbon monoxide 3 nitrogen 4 methane Which gases are atmospheric pollutants?

Which compounds are in the same homologous series?

The diagrams show four structures of C4H8. Which structures represent the same molecule?

The displayed formulae of two organic compounds are shown. What are the names of these compounds?

Two products of the separation of petroleum are the lubricating oil fraction and the kerosene/paraffin fraction. Which statement is correct?

An incomplete equation for the reaction of propane with chlorine is shown. C3H8 + Cl2 → C3H7Cl + X A student writes three statements about this rea...

Glycerol is an alcohol with three –OH groups per molecule. What is the equation for the combustion of glycerol?

Compound X decolourises acidified aqueous potassium manganate(VII). Compound X has the empirical formula C2H5O. Some possible structures of X are s...

A student does two experiments. In experiment 1, ammonium carbonate is reacted with dilute hydrochloric acid. In experiment 2, ammonium carbonate i...

A solid substance is placed in a flask. The flask is gently heated and the temperature of the substance is recorded at regular time intervals. The ...

A crystal of sodium chloride is dropped into a beaker of water and the crystal dissolves. There are four stages in this process. 1 The water molecu...

W is ethene, X is air, Y is iodine and Z is brass. Which row is correct?

Which statement about the isotopes of bromine is correct?

Which diagram shows a section of the ionic lattice of sodium chloride?

When dilute hydrochloric acid is added to aqueous lead(II) nitrate, a white precipitate of lead(II) chloride is formed. What is the ionic equation ...

Which row shows a pair of molecules where the Mr of compound X is exactly half that of compound Y? [Ar: C, 12; Cl, 35.5; H, 1; Ο, 16]

One volume of a gaseous element, X2, combines with an equal volume of gaseous hydrogen to form two volumes of a gaseous hydride. What is the formul...

Which reaction would produce the greatest volume of carbon dioxide at room temperature and pressure? [Mr: CaCO3, 100; Na2CO3, 106; CuCO3, 124]

Chrome alum is the common name for a salt which has the formula CrK(SO4)2. What is the percentage by mass of chromium in chrome alum?

Aqueous copper(II) sulfate is electrolysed using copper electrodes. Which row correctly describes what happens?

Hydrogen reacts with chlorine to form hydrogen chloride. H2(g) + Cl2(g) → 2HCl(g) The enthalpy change, ∆H, for this reaction can be calculated usin...

Nitrogen and oxygen react as shown. N2(g) + 2O2(g) → 2NO2(g) The enthalpy change for the reaction shown is +66 kJ. If two moles of nitrogen and two...

Physical changes and chemical changes can occur in substances. Which process describes a chemical change?