Cambridge & Pearson Edexcel Past Paper Questions

An aqueous mixture of copper(II) nitrate and silver nitrate is electrolysed with pure copper electrodes. Which half-equation correctly describes th...

The diagram shows the electrolysis of concentrated and dilute aqueous sodium chloride using inert electrodes. Gases are produced and collected in e...

Which positive ions are present in aqueous copper(II) sulfate?

These statements refer to hydrogen and its use as a fuel. 1 Both water and hydrocarbons can be used as a source of hydrogen. 2 In a fuel cell hydro...

Ethanol is produced by the fermentation of glucose from sugar cane. In some countries ethanol is used as a fuel. Which statements are correct? 1 Su...

Which changes will speed up a chemical reaction? 1 decreasing the pressure in a reaction between gases 2 increasing the size of the solid particles...

Magnesium reacts with dilute sulfuric acid. Mg(s) + H₂SO₄(aq) → MgSO₄(aq) + H₂(g) Two experiments are carried out at 25 °C. experiment 1 24.0 g of ...

In which equations is the change in the underlined species correct? 1 CH₄ + 2O₂ → CO₂ + 2H₂O -oxidation 2 2H₂S + SO₂ → 3S + 2H₂O -reduction 3 BrO₃⁻...

The Haber process converts nitrogen and hydrogen into ammonia. N₂(g) + 3H₂(g) ⇌ 2NH₃(g) Which row is correct?

Which row shows the pH values for 0.1 mol/dm³ solutions of ammonia, hydrochloric acid, sodium chloride and sodium hydroxide?

The water in a lake is acidic and the fish are dying. The water in the lake needs to be neutralised. Which compound can be added in excess to neutr...

Two incomplete statements about the preparation of an insoluble salt are given. .......1....... can be used to prepare insoluble salts, such as ......

The Haber process is used to make ammonia at a temperature of 400 °C and a pressure of 20 000 kPa. The temperature is changed to 500 °C but the pre...

Some properties which indicate the differences in elements are listed. 1 metallic character 2 number of electron shells in an atom 3 number of prot...

Elements X and Y combine to form an ionic compound. Atoms of X have more protons than atoms of Y. Atoms of Y have more valence electrons than atoms...

The elements in Group I of the Periodic Table show trends in both their reactivities and their melting points. Rubidium is in Group I. Which statem...

The properties of four substances are shown. Which substance is a metal?

Group I elements and transition elements are metals. Student X suggests that the Group I elements are above hydrogen in the metal reactivity series...

Tin is more reactive than lead but less reactive than iron. Which method would be most suitable for extracting tin from its ore?

Attaching pieces of magnesium to underground iron pipes can protect the iron from corrosion. Which reaction protects the iron from corrosion?

Which reactions take place during the extraction of aluminium from aluminium oxide using carbon electrodes? 1 2O²⁻ → O₂ + 4e⁻ 2 C + O₂ → CO₂ 3 Al²⁺...

Which statement about gases in the atmosphere is correct?

Compound X is shown in the dot-and-cross diagram. Which statement about compound X is correct?

An ester has the formula C₂H₅COOC₂H₅. Which pair of compounds would react together to form this ester?

X is a polymer. When X is hydrolysed one of the products is substance Y. Which type of polymer is X?

The formula of magnesium oxide can be investigated by using the fact that when magnesium is heated it reacts with oxygen to form magnesium oxide. W...

Which separation method would give pure samples of both substances from the mixture?

An aqueous solution of J is a colourless solution that contains cations and chloride ions. Separate samples of the solution give a white precipitat...

Which statement about states of matter is correct?

Use the Periodic Table to answer this question. Which two particles have the same number of electrons?

The table shows data for particles W, X, Y and Z. particle: W, proton number: 6, nucleon number: 12, number of electrons: 6; particle: X, proton nu...

Which dot-and-cross diagram correctly shows a molecule of ethene?

The names and formulae of three nitrogen compounds are shown. ammonia NH3 hydrazine N2H4 hydroxylamine NH2OH Which compound has the highest relativ...

10 cm³ of propane is burned in 70 cm³ of oxygen in a closed container. C3H8(g) + 502(g) → 3CO2(g) + 4H2O(l) What is the total volume of gas present...

When a mixture of sodium chloride and sodium hydrogencarbonate is heated, the reaction shown takes place. 2NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g) ...

Molten sodium chloride is electrolysed. Which change occurs at the cathode?

Natural gas is used as a source of energy. What is the main compound in natural gas?

Aqueous sodium thiosulfate reacts with hydrochloric acid. The rate of the reaction increases if the concentration of both reactants is increased. N...

Magnesium reacts with dilute sulfuric acid. Mg(s) + H2SO4(aq) → MgSO4(aq) + H2(g) Two experiments are carried out at 25 °C. experiment 1 24.0 g of ...

Solution X is colourless. A few drops of aqueous potassium iodide solution are added to a sample of X. No change is seen. Solution Y is colourless....

Brown nitrogen dioxide reacts to form colourless dinitrogen tetroxide in a reversible reaction. The forward reaction is exothermic. 2NO2(g) ⇌ N2O4(...

Four test-tubes are set up as shown. What is the effect of adding dilute hydrochloric acid to each test-tube? (key: X = clear solution, ✓ = precipi...

Aqueous ammonia reacts with a compound to form a salt, ammonium phosphate. What type of reaction will ammonia undergo to form ammonium phosphate?

Sulfuric acid is manufactured in the contact process. Several substances are involved in this process, including vanadium(V) oxide and water. Which...

Germanium is in Group IV of the Periodic Table. It has a proton number of 32. Selenium is in Group VI of the Periodic Table. It has a proton number...

The proton number of caesium is 55. Compared with lithium, the melting point of caesium is ......1...... and the reaction of caesium with water is ...

Nickel is a transition element. Which properties does it have? 1 It can act as a catalyst. 2 It conducts electricity when molten. 3 It forms colour...

Which metal reacts with steam and can be extracted from its ore by reduction with carbon?

Three correct statements about aluminium are listed. 1 Aluminium is the most common metal in the Earth's crust. 2 It is costly to extract aluminium...

Iron is extracted from its ore, haematite, in a blast furnace. Which statement about this extraction process is correct?