Cambridge & Pearson Edexcel Past Paper Questions

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?

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...

Which ionic equation represents a redox reaction?

The equation shows the reaction for the formation of sulfur trioxide using a catalyst. 2SO2(g) + O2(g) ⇌ 2SO3(g) ΔH = –197 kJ/mol Which change in r...

To which substance is dilute sulfuric acid added to prepare lead(II) sulfate?

Which metal can react with water at r.t.p.?

Which statement about amphoteric oxides is not correct?

Which statement explains why the chemical properties of sodium and potassium are similar?

The diagram shows an outline of part of the Periodic Table. Which statement is not correct?

The diagram shows apparatus that can be used to extract aluminium. What are J, K and L? J | K | L || A negative electrode | aluminium oxide + cryol...

A gas G 1 has no smell, 2 is not poisonous, 3 reacts with hydrogen at high temperature and pressure. What is gas G?

Which method of water purification can be used to obtain drinkable water from seawater?

Which atmospheric pollutant is produced by bacterial decay of vegetable matter?

Substance P reacts with dilute hydrochloric acid to produce a gas. This gas reduces substance Q. What are substances P and Q? P | Q || A copper | c...

Which two statements about alloys are correct? 1 Alloys are formed by mixing two metals. 2 Alloys do not conduct electricity. 3 Atoms in an alloy m...

A powdered mixture of metals contains aluminium, calcium, silver and iron. Excess hydrochloric acid is added until no more mixture dissolves. What ...

Iron rusts when exposed to oxygen in the presence of water. Which method will not slow down the rate of rusting of an iron roof?

A compound has the following structure. Which reactions will occur with this compound? 1 Bromine water will decolourise. 2 It will react with an al...

In the Periodic Table, how many periods are needed to accommodate the elements of atomic numbers 1-18?

A compound X has the molecular formula C4H8O2. It reacts with calcium carbonate to give carbon dioxide. What is X?

Methane is the first member of the alkane series of hydrocarbons. The second member is ethane. Which statements about ethane are correct? 1 Ethane ...

Which alkane, when any one hydrogen atom is substituted by a chlorine atom, will not produce isomers?

When ethanol reacts with ethanoic acid, the ester ethyl ethanoate is formed. C2H5OH + CH3CO2H → CH3CO2C2H5 + H2O What is the formula of the ester f...

The table gives some statements about some macromolecules. 1 fats contain the linkage -O-C(=O)- proteins contain the linkage -C(=O)-N(H)- || 2 poly...

Which of these compounds could react together to form a polymer? 1 H2N(CH2)6NH2 2 CH3(CH2)4COOH 3 HOOC(CH2)4COOH 4 H2N(CH2)6CH3

A student wants to carry out an experiment to follow the rate of the reaction between hydrochloric acid and marble chips. CaCO3 + 2HCl → CaCl2 + CO...

Solutions of lead(II) nitrate and potassium iodide are mixed together in the preparation of lead(II) iodide. Which method can be used to separate t...

A small amount of aqueous copper(II) sulfate is put into a test-tube. A few drops of aqueous ammonia are added to the test-tube. Then an excess of ...

An atom of element Z has 14 neutrons and 13 protons. It forms a positive ion. How many electrons does the ion of Z have?

Which gas is neither an element nor a compound?

The compound formed between elements X and Y is ionic. Which statement about elements X and Y is correct?

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 ...

How many electrons are used in covalent bonding in the N2 molecule?

Propene, CH3CH=CH2, has a very low boiling point because of the weakness of the

What is the empirical formula of a compound containing 12g of carbon, 2g of hydrogen and 16g of oxygen only?

What is the correct equation for the reaction taking place at the negative electrode when molten magnesium chloride is electrolysed using inert ele...

Which fertiliser contains the greatest percentage by mass of nitrogen?