Cambridge & Pearson Edexcel Past Paper Questions

Dry air is a mixture of gases of which 99% is nitrogen and oxygen. What is the main constituent of the remaining 1%?

Why is chlorine added to the water supply?

When the alcohol of molecular formula C4H10O is oxidised, what is the molecular formula of the acid formed?

The diagrams show the structures of five hydrocarbons. Which three hydrocarbons are isomers of each other?

Which alcohol and acid will react together to make the ester CH3COOC2H5?

Which compound has a pH of less than 7 in aqueous solution?

A1 (a) Choose from the following elements to answer the questions. calcium chlorine chromium copper krypton nitrogen oxygen sodium sulfur Each elem...

A2 Copper(II) sulfate is an ionic compound.

A3 The diagram shows the structure of a metal. Key + metal ion – electron [Figure 6.1: A lattice of positive metal ions with a sea of delocalised e...

A4 The structure of malic acid is shown. [Figure 8.1: Structural formula of malic acid, H-OOC-CH(OH)-CH₂-COOH]

A5 Hydrocarbons undergo complete combustion to form carbon dioxide and water.

B6 Ethanoic acid is a weak acid.

B7 Some properties of the Group IV elements are shown in the table. element | melting point /°C | relative electrical conductivity carbon (diamond)...

B8 Concentrated aqueous ammonia is used to make fertilisers such as ammonium phosphate, (NH4)3PO4-

B9 Cyclopropane is converted to propene when heated. [Figure 18.1: Diagram showing cyclopropane (H₂C-CH₂-CH₂) converting to propene (CH₃CH=CH₂)]

Choose from the following elements to answer the questions. aluminium carbon hydrogen iron magnesium nitrogen oxygen sodium vanadium Each element m...

Sodium chloride, NaCl, and magnesium chloride, MgCl2, are both ionic compounds.

Metals have characteristic physical properties such as good electrical and thermal conductivity.

Lavandulol is found in lavender plants. CH3 CH2 C=CH−CH2−CH−C CH3 CH3 CH2OH

Dilute ethanoic acid reacts with sodium carbonate. Sodium ethanoate, CH3COONa, and two other compounds are formed.

At high temperatures, hydrogen reacts with iodine to form hydrogen iodide. H2(g) + I2(g) ⇌ 2HI(g) ΔH = + 53.0 kJ/mol

The table shows the melting points and relative electrical conductivities of three elements from Period 3 of the Periodic Table. property element m...

Potassium nitrate, potassium sulfate and potassium phosphate are used in fertilisers.

Nitrogen(V) oxide decomposes on heating to form nitrogen(IV) oxide and oxygen. 2N2O5(g) → 4NO2(g) + O2(g) The table shows how the rate of reaction ...

A student titrates aqueous sodium hydroxide from a burette with dilute hydrochloric acid in a conical flask. After the titration is complete, the c...

A substance dissolves in water to form a colourless solution. This solution reacts with aqueous silver nitrate in the presence of dilute nitric aci...

Which row shows the numbers of particles in ³⁴S²⁻?

Which substance has a giant covalent structure at room temperature?

Magnesium oxide has a high melting point. It is used to line the inside of furnaces that operate at high temperatures. Why does magnesium oxide hav...

What is the dot-and-cross diagram for NCl₃?

Two properties of a metal are given. 1 It is malleable. 2 It conducts electricity. Which of these properties are due to the layers of positive ions...

What are the relative formula masses of one mole of solid magnesium and one mole of gaseous chlorine?

Complete combustion of a hydrocarbon produces only carbon dioxide, CO₂, and water, H₂O. C₅H₁₂(l) + 8O₂(g) → 5CO₂(g) + 6H₂O(g) When 0.1 mol of the h...

Electrolysis is used to plate a metal statue with silver. The statue is an electrode in a suitable electrolyte. Which row is correct?

Which statements about endothermic reactions are correct? 1 Energy is absorbed from the surroundings. 2 Energy is released to the surroundings. 3 T...

The equation represents the reaction between two gases, X₂ and Y₂, to form compound XY. X₂(g) + Y₂(g) ⇌ 2XY(g) The energy profile diagram for the r...

The equation shows the reaction for the manufacture of ammonia. N₂(g) + 3H₂(g) ⇌ 2NH₃(g) Which change will decrease the activation energy of the re...

When bismuth(III) chloride, BiCl₃, is added to water, a reaction occurs and a white precipitate of BiOCl is formed. BiCl₃(aq) + H₂O(l) ⇌ BiOCl(s) +...

Calcium carbonate reacts with dilute hydrochloric acid to produce carbon dioxide. The carbon dioxide is collected using the apparatus shown. The re...

Three separate mixtures of a solution and a solid are made, as shown in the table. The mixtures are warmed. In which mixtures does gas form?

Insoluble salts are prepared by reacting aqueous solutions of soluble salts. A precipitate forms. Which pairs of aqueous solutions form a precipita...

The diagram shows the main stages in the manufacture of an ammonia-based fertiliser. What is happening in the process labelled X?

What is a use of sulfuric acid?

Which property shows an increasing trend in the elements, from Group I to Group VII, across a period of the Periodic Table?

The melting point of lithium is 181 °C. The melting point of sodium is 98 °C. Which statement explains why lithium has a higher melting point than ...

From their position in the Periodic Table, which properties would you expect the elements vanadium, chromium and cobalt to have? 1 variable oxidati...

The diagram shows the structure of an alloy. Which statement about alloys is correct?

The list shows the position of metal X in the reactivity series of metals. Na Al Fe X Cu Ag Which methods could be used to extract metal X? 1 elect...

An old commercial process for aluminium extraction used large quantities of sodium to convert aluminium ions into aluminium atoms. The modern alumi...

Which element is always present in steel?