Cambridge & Pearson Edexcel Past Paper Questions

Drinking water is obtained by purification of sea water and river water.

Ammonium iodide, NH4I, is a white solid which decomposes when heated. NH4I(s) → NH3(g) + HI(g)

Nitrogen monoxide reacts with oxygen to form nitrogen dioxide. If this reaction is investigated in a closed system, a dynamic equilibrium is estab...

A sample of waste includes plastic and copper.

The structures of cyclobutanol and butanoic acid are shown. [Figure 10.1]

Copper(II) sulfate is prepared by reacting excess copper(II) carbonate with dilute sulfuric acid. CuCO3(s) + H2SO4(aq) → CuSO4(aq) + CO2(g) + H2O(l...

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

Aluminium chloride is dissolved in water and the resulting solution is divided between three test-tubes. Which row gives the reagents for three tes...

Which statement about methods of purification and analysis is correct?

Which changes in pressure and temperature would both result in a decrease in the volume of a fixed mass of gas?

Which definition of isotopes is correct?

Which ion has the most shells that contain electrons?

Which substance conducts electricity both when solid and when molten?

Which substance is an ionic compound?

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?