Cambridge & Pearson Edexcel Past Paper Questions

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?

Two methods used by students to measure the rate of a reaction are the 'disappearing cross' method and the 'loss of mass' method. • For the 'disapp...

Hydrogen is used as a reactant both in the Haber process and in its addition to alkenes. Which row is correct?

Chlorine, Cl2, reacts with iron(II), Fe2+, ions. Cl2 + 2Fe2+ → 2Cl¯ + 2Fe3+ Which statement about this reaction is correct?

Information about three oxides, Q, R and T, is given. Q reacts with dilute sulfuric acid to form a salt and water. R reacts with both acids and bas...

Which definition of a hydrated substance is correct?

The table shows the number of electrons in one atom of each of the elements W, X, Y and Z. Which statement is correct?

Some properties of elements in Group VII and the reasons for these properties are shown. Which row shows a property and the reason for this property?

Which diagram represents an alloy?

A small piece of metal is added to a large beaker of water. A vigorous reaction occurs. When the reaction stops, a few drops of litmus are added to...

The rusting of iron can be prevented by coating the iron with another material. Which statement explains why coating with zinc is more effective th...

Which statement about water is correct?

Some compounds that can be used as fertilisers are listed. • ammonium nitrate • potassium nitrate • potassium phosphate • sodium phosphate Three of...

Different strategies to reduce the effects of environmental issues have been suggested. Which row is correct?

Which statement about organic compounds is correct?