Cambridge & Pearson Edexcel Past Paper Questions

Compound X has a composition by mass of 63.6% nitrogen and 36.4% oxygen. What is the empirical formula of X?

The table gives the relative formula mass of four compounds and the mass of each compound present in 1 dm³ of solution. Which solution has the high...

The diagrams show the structures of ethene and propene. Which statement about equal volumes of ethene gas and propene gas at r.t.p. is correct?

The energy profile diagram for both the catalysed and uncatalysed reactions between N2 and H2, in the Haber process, is shown. [Energy profile diag...

When water is liquid, it ionises slightly. H2O(l) ⇌ H+(aq) + OH⁻(aq) The forward reaction is endothermic. When the temperature of water is increase...

Which row correctly describes the solubilities of both ammonium sulfate and sodium carbonate in water?

Lead(II) chloride is an insoluble salt. Which two reagents are used to prepare a pure sample of lead(II) chloride?

The Haber process is used to make ammonia. Which catalyst is used in the Haber process?

Some compounds containing nitrogen are used as fertilisers. The table shows some nitrogen-containing compounds, whether they are used as a fertilis...

An atom of which element has the same electronic configuration as an atom of an ion of strontium?

Metals are elements that have many similar properties because of their structure. Which statement about metals is correct?

What happens when a strip of silver is immersed in aqueous copper(II) sulfate?

Four metals and hydrogen are arranged in order of decreasing reactivity. [Diagram showing a list of elements (potassium, aluminium, zinc, hydrogen,...

Iron is extracted from haematite in a blast furnace. Coke and limestone are added to the blast furnace. What is the function of the limestone?

Carbon dioxide, methane and oxygen are gases involved in the carbon cycle. Which of these gases may contribute to global warming?

Two statements about the water in lakes are given. statement 1 Fish are unable to live in some lakes because there is insufficient oxygen in the wa...

Chlorine reacts with methane. Which row is correct?

Which statements about alkenes are correct? 1 They have the general formula of CnH2n-. 2 They undergo addition reactions with steam. 3 They burn in...

X is a branched hydrocarbon with the ratio of carbon atoms to hydrogen atoms being 1:2. X has a relative molecular mass of 56. What is the identity...

The reactions listed all involve ethanol. 1 C2H5OH + O2 → CH3COOH + H2O 2 C2H5OH + CH3COOH → CH3COOC2H5 + H2O 3 C6H12O6 → 2C2H5OH + 2CO2 Which row ...

Ethanoic acid is reacted with propanol. What is the name and what is the structure of the ester produced?

The diagram shows the partial structure of a polymer. Which type of polymer does it represent?

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

During a titration experiment, an acid is transferred into a burette. The diagrams show part of the burette at the start of the titration and at th...

Chromatography can be used to separate and identify dyes present in a mixture. Which statement is correct?

Aqueous zinc chloride is tested with various reagents. Which observation is correct?

A sample of a gas occupies a volume of 2.0 dm³ at room temperature and pressure. Which changes in the conditions would both decrease the volume occ...

An ion contains 20 electrons and has a charge of +3. From which element was the ion formed?

Which substances contain at least one double bond? 1 C2H4 2 O2 3 C2H6 4 CO2

Magnesium will react with aqueous copper(II) sulfate to form copper and aqueous magnesium sulfate. What is the correct equation for this reaction?

A sample of magnesium hydroxide has a mass of 4.63 g. How many moles of magnesium hydroxide are present?

The equation shows the production of iron by the reduction of iron(III) oxide. Fe2O3 + 3CO → 2Fe + 3CO2 80 tonnes of iron(III) oxide produces 50 to...

The diagram shows the electrolysis of a mixture of aqueous copper(II) nitrate, Cu(NO3)2(aq), and aqueous silver nitrate, AgNO3(aq). Electrodes X an...

The energy profile diagram of a chemical reaction is shown. What is the value of the activation energy of the reaction?

When water is liquid, it ionises slightly. H2O(l) ⇌ H+(aq) + OH–(aq) The forward reaction is endothermic. When the temperature of water is increase...

Which salts could be prepared by precipitation? 1 barium sulfate 2 lead chloride 3 copper(II) chloride 4 zinc sulfate

Silver is below hydrogen in the reactivity series. Which row describes the chemicals used and the method of separation used to prepare a pure sampl...

Ammonia is manufactured by the Haber process. N2(g) + 3H2(g) ⇌ 2NH3(g) The forward reaction is exothermic. Which statement about the Haber process ...

The table contains some facts about sulfur dioxide and sulfuric acid and comments on these facts. Which row is correct? fact, comment A In the man...

Metals have high melting points. What is the reason for this?

Four metals and hydrogen are arranged in order of decreasing reactivity. [Figure 30.0] Which statement about these elements is correct?

Aluminium is extracted from its ore using electrolysis. Which statement about the electrodes used is correct?

Gas X is present in dry air and may contribute to global warming. What is X?

Four processes are used during the purification of water. • use of carbon • desalination • chlorination • filtration The purposes, W, X, Y and Z, f...

Propane undergoes substitution reactions when mixed with chlorine gas in the presence of ultraviolet light. Which compound could be formed when pro...

The hydrocarbon CH3CHCH2 will undergo a number of chemical reactions. In which reaction will the carbon to carbon single bond be broken?

Hydrocarbon compounds can form rings of carbon atoms as well as chains. The structures of two hydrocarbon rings are shown. Which of P and Q is unsa...

A sample of aqueous glucose is fermented with yeast at 37 °C in the absence of air. The main organic product, X, is purified by fractional distilla...

The diagram shows the structure of a compound called ethanoic anhydride. 1 mol of ethanoic anhydride reacts with water to form 2 mol of a carboxyli...

Burning polymers can cause atmospheric pollution. Which polymer, on burning, could produce nitrogen oxides?