Cambridge & Pearson Edexcel Past Paper Questions

25.0 g of hydrated copper(II) sulfate crystals are heated to produce anhydrous copper(II) sulfate and water vapour. CuSO₄.5H₂O(s) → CuSO₄(s) + 5H₂O...

One mole of an organic compound, Q, is completely burnt in oxygen and produces exactly three moles of water. Which compound is Q?

Aluminium is produced by the electrolysis of molten aluminium oxide. What is the correct equation for the reaction at the positive electrode?

When aqueous copper(II) sulfate is electrolysed using copper electrodes, which observations are correct?

Three different solutions were electrolysed using inert electrodes. solution 1 aqueous sodium chloride solution 2 concentrated hydrochloric acid so...

Under certain conditions nitrogen reacts with oxygen to form N₂O. 2N₂(g) + O₂(g) ⇌ 2N₂O(g) The energy profile diagram for this reaction is shown. W...

Sulfur trioxide is produced by the following reaction. 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) ΔH = –195 kJ Which change in conditions would produce a greater am...

A chemist investigated the rate of the reaction between ethene and hydrogen using a nickel catalyst. Ni C₂H₄(g) + H₂(g) → C₂H₆(g) The chemist carri...

Which change always occurs when a metal atom is oxidised?

Which reagent can be used to react with dilute hydrochloric acid to prepare silver chloride?

The table shows some symbols and their meanings. Which symbols should be used in the equation for the Haber process?

Nitrogenous fertilisers can cause eutrophication to occur in rivers. Eutrophication involves the five stages listed. 1 The fertiliser is washed int...

Three suggested uses of sulfuric acid are listed. 1 as battery acid 2 to make ammonia from ammonium salts 3 to make fertilisers Which are correct u...

Which row shows the correct catalyst for each industrial process?

Which metal is attached to underground pipes made of iron, to provide sacrificial protection from corrosion?

The diagram shows a circuit used to test the electrical conductivity of strips of solid materials. If the material conducts, the bulb lights. Strip...

Octane, C₈H₁₈, is a hydrocarbon that undergoes combustion in a petrol engine. ...W...C₈H₁₈ + ...X...O₂ → ...Y...CO₂ + ...Z...H₂O Which row shows th...

The diagram shows part of the carbon cycle. What are processes P, Q and R?

CFC compounds were used as aerosol propellants. The structure of one CFC compound is shown. Which element in this compound causes a depletion of oz...

What is removed or destroyed when water is desalinated to make it drinkable?

Compounds S and T both contain two elements only. The compounds have the following properties. • They both burn in air to form carbon dioxide and w...

Which row correctly describes alkenes?

The table contains statements about processes by which ethanol is produced on a large scale from ethene and from glucose. Which rows are correct?

Which compound has a pH of less than 7 in aqueous solution?

The diagram shows the repeat unit of a polymer. Which row correctly identifies the monomer and type of polymerisation involved in making this polymer?

A mixture of sand and sodium chloride can be separated in three steps. Step 1 is to add water to the mixture. The diagram shows step 2 and step 3. ...

The results of two tests on solution X are shown. reagent added | observation on adding a few drops of reagent | observation on adding an excess o...

A student follows the rate of the reaction between marble chips, CaCO3, and dilute hydrochloric acid. CaCO3 + 2HCl → CaCl2 + CO2 + H2O Which diag...

A chemist wishes to separate and identify a mixture of substances using paper chromatography. The diagram shows the apparatus used. The solvent is ...

Which particle contains the same number of both neutrons and electrons?

Which statement is correct for all metals?

X represents the element of atomic number 8 and Y represents the element of atomic number 19. The two elements react together to form a compound. W...

In an experiment, 1 mol of powdered copper and 1 mol of powdered zinc are placed in a flask. Dilute acid, containing 1 mol of acid, is added to the...

A simple cell can be made using two different metals as the electrodes and an aqueous solution as the electrolyte. Which statements about simple ce...

Magnesium can be produced by electrolysis of molten magnesium chloride, MgCl2. What are the equations for the reactions that occur at the positive ...

Three different solutions were electrolysed using inert electrodes. solution 1 aqueous sodium chloride solution 2 concentrated hydrochloric acid s...

Compound Y reacts with oxygen. This reaction has a positive enthalpy change of reaction, ΔΗ. What information can be deduced about Y and its reacti...

Sulfur trioxide is produced by the following reaction. 2SO2(g) + O2(g) ⇌ 2SO3(g) ΔΗ = –195 kJ Which change in conditions would produce a ...

Magnesium reacts with dilute sulfuric acid. Mg(s) + H2SO4(aq) → MgSO4(aq) + H2(g) Two experiments were carried out. experiment 1 24.0 g of magne...

Which statement is correct for both aluminium and iron?

A household cleaning compound is used to remove calcium carbonate from bathroom surfaces. The compound reacts with the calcium carbonate to form a ...

Dilute hydrochloric acid is added separately to samples of copper, copper(II) oxide and copper(II) carbonate. Which row correctly shows whether cop...

Which ions are present when hydrochloric acid has exactly neutralised aqueous sodium hydroxide?

Which experiment will result in the formation of a white precipitate?

Which statement about both the Group I and Group VII elements is correct?

The elements helium, argon and neon are noble gases. Which statement is correct?

Which row shows the correct catalyst for each industrial process?

In the solid state, germanium has the same structure as diamond. What is the likely melting point of germanium?

Aluminium is a metal that is often used to make caps for bottles. When thrown away and buried in the soil, the caps do not corrode. Why is this?

Which statement about Group I metals is correct?