Cambridge & Pearson Edexcel Past Paper Questions

The equation for the reaction between calcium carbonate and hydrochloric acid is shown. CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g) How many ...

The empirical formula of a liquid compound is C2H4O. To find the empirical formula, it is necessary to know the

The diagram shows the electrolysis of molten lead(II) bromide using inert electrodes. What happens during this electrolysis?

Which pair of metals X and Y will produce the highest voltage when used as electrodes in a simple cell?

The energy profile diagram for the reaction between hydrogen and chlorine is shown. What information about this reaction does the diagram show?

The following changes could be made to the conditions in the reaction between zinc and hydrochloric acid. 1 increase in concentration of the acid 2...

The equation shows what happens in a redox reaction between iron(II) chloride and chlorine gas. 2FeCl2 + Cl2 → 2FeCl3 Which equation describes the ...

Which acid and base react together to produce an insoluble salt?

A solution of fertiliser was tested as shown. Which ions must be present in the fertiliser?

Carbon and silicon are both in Group IV of the Periodic Table. Which statement is correct for both carbon dioxide and silicon dioxide?

Which calcium compound does not increase the pH of acidic soils?

Which deduction about the element astatine, At, can be made from its position in Group VII?

Which pair of properties are both correct for a typical transition element?

The diagram represents the manufacture of sulfuric acid by the Contact process. What is used in step R?

What happens when zinc foil is placed in an aqueous solution of copper(II) sulfate?

In the apparatus shown, gas P is passed over solid Q. No reaction occurs if P and Q are

Which element can only be extracted from its ore using electrolysis?

Scrap iron is often recycled. Which reason for recycling is not correct?

Which diagram represents the structure of an alloy?

Aluminium is higher than copper in the reactivity series so the following displacement reaction should be feasible. 2Al(s) + 3CuSO4(aq) → Al2(SO4)3...

The gases coming from a car's exhaust contain oxides of nitrogen. How are these oxides formed?

When a volcano erupts, which gas is produced in significant amounts?

Compound X is a hydrocarbon. It reacts with steam to form an alcohol. Which type of compound is X and what would be its effect on bromine water?

Useful fractions are obtained by the fractional distillation of petroleum. Which fraction is matched by its use?

Which statement about ethanoic acid is correct?

Which bond is present in both nylon and Terylene?

Compounds X and Y are both alkanes. Compound X has a higher boiling point than compound Y. What could be the formulae of compounds X and Y?

Four hydrocarbon structures are shown. Which hydrocarbons are isomers of each other?

With which substance will ethene react to form more than one product?

When a compound X is reacted with sodium carbonate, carbon dioxide gas is evolved. What could be the formula of compound X?

A student measured the rate of reaction between calcium carbonate and dilute hydrochloric acid. A graph showing the volume of gas produced against ...

A mixture of two substances is spotted onto a piece of chromatography paper. The paper is inserted into a beaker containing a liquid. For separatio...

Which molecule contains a total of three covalent bonds?

The addition of dilute acid to a solution containing the anion Q and the subsequent use of limewater can be used to identify the anion Q. What is Q?

Four substances have the following electrical properties. What are these four substances?

The proton number of element X is 6. The proton number of element Y is 9. What is the formula of a compound of these elements?

Which ion reacts with aqueous ammonia to give a precipitate that dissolves in an excess of ammonia?

Which statement about aqueous sodium chloride is correct?

15.0 cm³ of 1.0mol/dm³ potassium hydroxide just neutralise 20.0 cm³ of a solution of nitric acid. What is the concentration of the acid?

An atom, X, contains 16 protons. Which statement about X is correct?

The equation for the burning of hydrogen in oxygen is shown. 2H2(g) + O2(g) → 2H2O(g) What does this equation indicate?

The diagram shows an apparatus used to compare rates of diffusion. At which labelled position did a white deposit of ammonium chloride form?

Which statement about conduction of electricity is correct?

In terms of electrons, what happens when potassium combines with iodine to form a compound?

Aqueous copper(II) sulfate is electrolysed using copper electrodes. Which equation represents the reaction taking place at the anode (positive elec...

The combustion of methane is exothermic. The equation is given below. CH4 + 2O2 → CO2 + 2H2O What can be deduced from the fact that the reaction is...

How does a catalyst increase the speed of a reaction?

Copper(II) carbonate powder was heated. The loss in mass was plotted against time as shown on the graph. During which time interval is the reaction...

In which equation is the underlined element reduced?

A sample of air was bubbled into water. The pH of the water slowly changed from 7 to 6. Which gas in the sample caused this change?