Cambridge & Pearson Edexcel Past Paper Questions

Aqueous silver nitrate is added to separate solutions of potassium chloride and sodium iodide. What are the colours of the precipitates formed?

Which substance will not conduct electricity at room temperature and pressure?

Which diagram correctly shows the arrangement of the ions in solid sodium chloride?

The diagram shows the electrolysis of aqueous sodium chloride and of molten sodium chloride. Which substance in the diagram has both positive ions ...

Which statement describes the conversion of magnesium atoms to magnesium ions?

The diagram shows the structural formula of the covalent molecule hydrazine, N2H4. Consider all the electrons in a molecule of hydrazine. Which des...

Sodium hydrogencarbonate decomposes on heating. 2NaHCO3 → Na2CO3 + H2O + CO2 In an experiment, a 5.0 mol sample of sodium hydrogencarbonate is heat...

Nitrogen and oxygen react according to the equation. N2(g) + 2O2(g) → 2NO2(g) The enthalpy change for the reaction shown is +66 kJ. If two moles of...

Which statement about the four gases carbon dioxide, CO2, hydrogen, H2, oxygen, O2 and ozone, O3 is correct?

When dilute sulfuric acid is electrolysed between inert electrodes, which statements are correct? 1 Hydrogen is released at the negative electrode....

When electrolysed using inert electrodes, which dilute solution would produce the greatest increase in mass of the cathode? [Ar: Al, 27; Cu, 64; Pb...

The formation of liquid water from hydrogen and oxygen is thought to occur in three stages. 1 2H2(g) + O2(g) → 4H(g) + 2O(g) 2 4H(g) + 2O(g) → 2H2O...

When bismuth(III) chloride, BiCl3, is added to water, a white precipitate of BiOCl is formed. BiCl3(aq) + H2O(l) ⇌ BiOCl(s) + 2HCl(aq) If this reve...

Which colour change occurs when ethanol is added to a small quantity of warm, acidified potassium dichromate(VI)?

Sulfur and selenium, Se, are in the same group of the Periodic Table. From this, we would expect selenium to form compounds having the formulae

When the product of a reaction between two gases is added to water, a solution of pH7 is formed. Which could be these gases?

When pure gas X was passed through the apparatus shown, the copper(II) oxide turned pink and the limewater stayed colourless. What is gas X?

Which reagent is added to aqueous potassium chloride to prepare lead chloride?

Which change in the properties of the halogens is not correct?

W, X and Y are elements in the same period of the Periodic Table. • X forms compounds of formulae XCl2 and XCl3. • Y forms a solution of pH12 when ...

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

The metals iron, lead and zinc can be manufactured by the reduction of their oxides with coke. What is the correct order of the ease of reduction o...

Aluminium is manufactured by the electrolysis of molten aluminium oxide. Which gas is not formed during this process?

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

Metals usually occur in their ore combined with another element. Which metal is least likely to occur combined with another element?

The noble gases, argon, helium, krypton and xenon, are present in air. Which noble gas is present in the largest proportion?

Which gas will react with ozone in the upper atmosphere of the Earth?

Iron is extracted from iron ore in a blast furnace. Which solid substances are fed into the top of the blast furnace? 1 coke 2 cryolite 3 limestone

The diagram shows a simplified structure of a fat. Which compounds in the table have linkages that can be found in this fat? (Do not consider C-H o...

The solubility of the carboxylic acids in water decreases as the size of the carboxylic acid molecules increases. Which carboxylic acid is the leas...

Poly(ethene) is the addition polymer formed from the monomer ethene. Which statement is correct?

The diagram shows the fractionation of crude oil. Which row explains why fraction R is collected above fraction S?

In the manufacture of ethanoic acid, the chemical industry uses the following sequence of reactions. compound X →(1) ethene →(2) ethanol →(3) ethan...

Esters are formed when an alcohol reacts with a carboxylic acid. Which ester would be formed using the carboxylic acid and alcohol shown?

Which equation represents a combustion reaction?

Calcium carbonate reacts with hydrochloric acid, producing carbon dioxide gas. CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g) The rate of this r...

Which compound when in aqueous solution will produce a red/brown precipitate on the addition of an aqueous solution of Fe3+ ions?

What is the correct sequence for obtaining pure salt from a mixture of sand and salt?

The diagram shows the structure of which element in Period 3?

The table contains information on the structure of four particles. particle | proton number | number of protons | number of neutrons | number of el...

Which statement describes ionic bonding?

The experiment shown is used to test potassium bromide crystals. The lamp does not light. Distilled water is then added to the beaker and the lamp ...

Why does ammonia gas diffuse faster than hydrogen chloride gas?

Which molecule has only four electrons involved in covalent bonds?

A volume of ethane, C2H6, at r.t.p. has a mass of 20 g. What is the mass of an equal volume of propene, C3H6, at r.t.p.?

Which element requires the largest number of electrons for one mole of the metal to be formed from its aqueous ions during electrolysis?

Which changes are observed during the electrolysis of aqueous copper(II) sulfate using copper electrodes? 1 A pink solid is deposited on the negati...

Analysis of a sample of an oxide of nitrogen gave the following data. • percentage by mass of nitrogen 47% • percentage by mass of oxygen 53% What ...

Petroleum is a mixture of hydrocarbons which can be separated into fractions by fractional distillation. Which row shows the fractions in order of ...

Which is not true about the process of photosynthesis?