Cambridge & Pearson Edexcel Past Paper Questions
Browse 35,704 questions from Cambridge O-Level & A-Level and Pearson Edexcel IGCSE & IAL exams. Click any question to practice.
Which statement about ammonia is completely correct?
What happens when bromine solution is added to a solution of sodium iodide?
The halogens exist as diatomic molecules, X₂. The boiling points of the Group VII elements increase as the group is descended from chlorine to iodi...
The compound hex-3-en-1-ol, P, has a strong 'leafy' smell of newly cut grass and is used in perfumery. CH₃CH₂CH=CHCH₂CH₂OH P What is produced when ...
Sorbic acid is used as a food preservative because it kills fungi and moulds. [Figure 21.1] Sorbic acid will react with • hydrogen in the presence ...
Aqueous sodium hydroxide reacts with 2-bromo-2-methylpropane to give 2-methylpropan-2-ol. The reaction proceeds by an Sɴ1 mechanism. How should the...
Compound Y can be hydrolysed by warm aqueous silver nitrate to form a precipitate that is soluble in dilute aqueous ammonia. Compound Y can undergo...
The compound shown is menthol, a naturally-occurring alcohol found in peppermint oil. [Figure 25.1] When menthol is heated with concentrated sulfur...
Use of the Data Booklet is relevant to this question. Which volume of oxygen measured at room temperature and pressure is needed for complete combu...
Which carbonyl compound reacts with hydrogen cyanide to form a product that has no chiral carbon atom?
How many of the following compounds produce a carboxylic acid on heating under reflux with hot acidified K₂Cr₂O₇? CH₃CH₂CHO CH₃COCH₃ CH₃CH₂CH₂OH CH...
Compound Y has Mᵣ of 88. It does not fizz when added to a solution of sodium hydrogencarbonate. It can be hydrolysed by dilute sulfuric acid to pro...
Polymerisation of ethene gives poly(ethene). How does the carbon–carbon bond in poly(ethene) compare with that in ethene?
Use of the Data Booklet is relevant to this question. In which pairs do both species have the same number of unpaired p electrons? 1 Al²⁻ and O⁺ 2 ...
The diagram shows the reaction pathway for a reversible reaction. [Figure 32.1] Which statements are correct? 1 The enthalpy change for the backwar...
Which substances contain delocalised electrons? 1 cyclohexene 2 graphite 3 sodium
Solids W, X, Y and Z are compounds of two different Group II metals. Some of their applications are described below. Compound W is used as a refrac...
Which properties increase in the sequence hydrogen chloride, hydrogen bromide and hydrogen iodide? 1 thermal stability 2 bond length 3 ease of oxid...
Sulfur dioxide is an atmospheric pollutant that causes acid rain. One of the reactions in this process is the oxidation of sulfur dioxide to sulfur...
Which are properties of fluoroalkanes? 1 They are less reactive than the corresponding chloroalkanes. 2 They are non-flammable. 3 The C–F bond is s...
What can be produced when an aqueous solution of butan-2-ol is oxidised under suitable conditions? 1 butanone 2 butanoic acid 3 butanal
The Mᵣ of compound X is 72. The composition by mass of X is 66.7% carbon, 11.1% hydrogen and 22.2% oxygen. X gives an orange precipitate with 2,4-d...
An organic compound, Z, will react with calcium metal to produce a salt with the empirical formula CaC₄H₆O₄. What could be the identity of Z? 1 eth...
The diagram shows a Boltzmann distribution of molecular energies for a gaseous mixture. The distribution has a peak, labelled P on the diagram. [Fi...
Substances X, Y and Z are all solids. Some of their physical properties are given in the table. [Figure 2.1] What type of lattice could each substa...
The enthalpy change of formation of carbon dioxide is –394 kJ mol⁻¹. The enthalpy change of formation of water is –286 kJ mol⁻¹. The enthalpy chang...
Hydrogen and carbon dioxide gases are mixed in equal molar amounts at 800K. A reversible reaction takes place. H2(g) + CO2(g) ⇌ H2O(g) + CO(g) At e...
In the diagram, curve X was obtained by observing the decomposition of 100 cm³ of 1.0 mol dm⁻³ hydrogen peroxide, catalysed by manganese(IV) oxide....
In which reaction is the species in bold acting as an oxidising agent?
The formation of hydrogen and ethyne, C2H2, from methane reaches dynamic equilibrium. 2CH4(g) ⇌ 3H2(g) + C2H2(g) What are the units of Kp?
Which equation represents the standard enthalpy change of formation of ethanol, C2H5OH?
Use of the Data Booklet is relevant to this question. In an experiment, 12.0 dm³ of oxygen, measured under room conditions, is used to burn complet...
Shown on the graph are the relative values of the first ionisation energies of four elements that have consecutive atomic numbers. One of the eleme...
The diagram shows the skeletal formula of cyclopropane. [Figure 11.1] The enthalpy change of formation of cyclopropane is +53.3 kJ mol⁻¹ and the en...
When barium is burnt in oxygen, what colour is the flame?
X and Y are oxides of different Period 3 elements. If one mole of Y is added to water, the solution formed is neutralised by exactly one mole of X....
Ammonium sulfate in the soil is slowly oxidised by air, producing sulfuric acid, nitric acid and water as the only products. How many moles of oxyg...
Which statement about the oxides and hydroxides of the Group II elements Mg, Ca, Sr and Ba is correct?
Which graph correctly shows the relative melting points of the elements Mg, Al, Si and P plotted against their relative electronegativities? [Figur...
When solid sodium iodide reacts with concentrated sulfuric acid, the products include NaHSO4, H2S, SO2 and S. In the formation of which product has...
A test-tube of HBr(g) and a test-tube of HI(g) are heated to the same temperature. Which combination of observations is possible? [Figure 18.1]
Use of the Data Booklet is relevant to this question. In an experiment, 0.125 mol of chlorine gas, Cl2, is reacted with an excess of cold aqueous s...
The diagram shows the skeletal formula of phenazine. [Figure 20.1] What is the empirical formula of phenazine?
Halogenoalkanes undergo a range of nucleophilic substitution reactions. Which reaction proceeds only by an SN1 mechanism?
Which alcohol has a chiral centre and can be oxidised to a ketone?
An ester of structural formula CH3CO2CH3 is heated with an aqueous solution of sodium hydroxide. What are the two organic products of this reaction?
Ethene reacts with aqueous bromine to give two products, CH2BrCH2Br and CH2BrCH2OH. Which statement about these products is correct?
Which statement does not correctly describe a problem related to the disposal of PVC?
Compound X, C4H8O, produces an orange precipitate when it is reacted with 2,4-dinitrophenylhydrazine reagent. Compound X produces a carboxylic acid...
Dichlorodifluoromethane, CCl2F2, has been used in aerosol propellants and as a refrigerant. Which statement helps to explain why dichlorodifluorome...