Cambridge & Pearson Edexcel Past Paper Questions

The dot-and-cross diagrams for four compounds are shown. Which diagram is correct? (Note that only the outer shell electrons are shown.)

A chicken egg has a mass of 60 g. The egg shell is 10% of the total mass. The egg shell is made of calcium carbonate. What is the mass of calcium i...

Ethanol can be made by the reaction shown. C2H5Br + NaOH → C2H5OH + NaBr If 5.00 g of C2H5Br produces 1.59 g of ethanol, what is the molar percenta...

An aqueous solution contains 0.01 mol of Zn²⁺(aq) and 0.01 mol of Cu²⁺(aq). Aqueous sodium hydroxide is added until in excess. After shaking, the m...

Which arrangement is used to electroplate copper onto a steel key?

The rate of reaction between calcium carbonate and hydrochloric acid is measured in three separate experiments. In experiment 1, the calcium carbon...

Pieces of zinc are added to aqueous copper(II) sulfate. Cu²⁺(aq) + Zn(s) → Zn²⁺(aq) + Cu(s) Which statement is correct?

The oxide of element X reacts with acids to form salts. Which statement about element X or its oxide is correct?

Nitrogenous fertilisers promote plant growth and crop yield. Which compound contains the greatest mass of nitrogen in 100 g of fertiliser?

Which statement about sulfuric acid is correct?

The diagram shows part of the Periodic Table. Which element has the highest proton number and which element has the largest number of valence elect...

A lump of element X can be cut by a knife. During its reaction with water, X floats and melts. What is X?

Which statement about the properties of some elements is correct?

Which diagram shows the structure of an alloy?

The equations show reactions taking place in the blast furnace. In which reaction is an acidic impurity, present in iron ore, removed?

Which diagram correctly shows the conditions necessary for the rusting of iron and also the metal that can be used to prevent rusting by sacrificia...

In the electrolysis of molten aluminium oxide, which statement is correct?

Which row correctly compares carbon dioxide and methane?

Sea water is not safe to drink. It can be converted into drinkable water by desalination. What does desalination involve?

Fats are essential components of the human diet. The diagram shows a fat molecule. Which description of this fat molecule is correct?

A molecule of the compound C4H6 is shown. This molecule undergoes an addition reaction with excess bromine and an addition reaction with steam. One...

The molecules of two hydrocarbon compounds X and Y each contain only four carbon atoms. X is saturated and Y is unsaturated. Which statements are c...

Which conversions involve oxidation? 1 ethanol → carbon dioxide + water 2 ethanol → ethanoic acid 3 ethene → poly(ethene)

Compound T reacts with magnesium, aqueous sodium hydroxide and ethanol. Which group does T contain?

Which type of reaction could be used in the polymerisation of ethene?

Insulin is a protein made in the human body. Which statements about insulin are correct? 1 It is a condensation polymer. 2 It is a synthetic polyme...

Which statement about polymers is correct?

Aqueous sodium thiosulfate reacts with acid to make a precipitate of sulfur. Na2S2O3(aq) + 2HCl(aq) → 2NaCl(aq) + H2O(l) + SO2(g) + S(s) A student ...

A paper chromatography experiment is carried out to find an Rƒ value for Fe³⁺(aq). The result is shown. To make the spot containing Fe³⁺(aq) more v...

The diagram shows two experiments. What are the results of adding an excess of NaOH(aq) in each experiment?

Which methods of separation require a change of state from liquid to gas? 1 paper chromatography 2 crystallisation 3 distillation 4 filtration

Hydrogen sulfide, H2S, and hydrogen chloride, HCl, are both gases at temperatures above -50 °C. Which gas will diffuse most rapidly at the temperat...

The diagram shows the relative mass and the relative charge of two particles, O and ●, present in atoms and ions. Which of these particles are pres...

When they react together, which pair of elements form an ionic compound?

How many shared electrons are in one carbon dioxide molecule?

Element X has a lattice of positive ions and a 'sea of electrons'. Which property will X have?

Which row shows the correct state symbols for the reaction between calcium carbonate and dilute hydrochloric acid? (The conditions are room tempera...

The expression shown for the value of Ar for fluorine is incomplete. Ar (fluorine) = Which row should the gaps in the expression be correctly compl...

A mixture of 5 cm³ of CH4 and 100 cm³ of air is exploded. Assume air is 80% N2 by volume and 20% O2 by volume. The resulting mixture is cooled. All...

The chloride of metal X is dissolved in water. A concentrated solution of this chloride is electrolysed using inert electrodes. X is above sodium i...

Which change in conditions, for the reaction between zinc and dilute sulfuric acid, increases the rate of reaction by lowering the activation energy?

Many reactions can be classified as redox reactions. Which equations show redox reactions? 1 Mg + 2HCl → MgCl2 + H2 2 2FeCl2 + Cl2 → 2FeCl3 3 2Na +...

Which row correctly shows whether the hydrogen ion concentration and the pH of ethanoic acid are higher or lower than those of hydrochloric acid of...

Two fertilisers are made by mixing chemical compounds. Fertiliser X contains 500 g of NH4NO3 and 500 g of (NH4)2SO4 per kilogram. Fertiliser Y cont...

Which processes occur in the manufacture of sulfuric acid? 1 burning sulfur in air 2 dissolving sulfur dioxide in sulfuric acid 3 dissolving sulfur...

Chlorine is passed into separate samples of aqueous potassium iodide and aqueous potassium bromide. In which solutions is there a colour change?

Which equation shows a thermal decomposition that occurs in the blast furnace?

Aluminium is produced by the electrolysis of pure aluminium oxide. One of the electrodes in the process has to be replaced often. Which statement i...

Sea water has to be purified in order to obtain drinking water from it. Which processes are used to purify the sea water?

Which structure represents an isomer of butane?