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.
The diagram shows the structure of ethanedioic acid. [Figure 28.1] Ethanedioic acid reacts with ethanol in the presence of a few drops of concentra...
When heated with KOH dissolved in ethanol, halogenoalkanes can undergo an elimination reaction to form alkenes. What are the possible elimination p...
Artemisinin is a powerful anti-malarial drug. [Figure 30.1] How many chiral centres are there in each molecule of artemisinin?
P and Q are two compounds with similar Mr values. Molecules of P attract each other by hydrogen bonds. Molecules of Q attract each other by van der...
The reaction E + F ⇌ G + H is catalysed by platinum. Which statements about the properties of the catalyst are correct? 1 The catalyst has no effec...
Which elements have atoms which can form π bonds with atoms of other elements? 1 oxygen 2 nitrogen 3 fluorine
Sulfuric acid is a Brønsted-Lowry acid. In which reactions is sulfuric acid behaving as an acid? 1 H2SO4 + HNO3 → H2NO3⁺ + HSO4⁻ 2 H2SO4 + CO3²⁻ → ...
Silver chloride dissolves in aqueous ammonia. What happens in this process? 1 Ammonia forms a complex with the Ag⁺ ion. 2 Ammonia acts as a Brønste...
A car has a catalytic converter fitted to its exhaust. On analysis its exhaust gases are shown to contain small quantities of nitrogen oxides. Whic...
Which alcohols cannot be dehydrated to form alkenes? 1 CH3OH 2 (CH3)3COH 3 CH3CH2OH
Menthol is a naturally-occurring alcohol found in peppermint oil. [Figure 38.1] Which reagents will react with menthol? 1 aqueous bromine 2 sodium ...
Which pairs of reagents will take part in a redox reaction under suitable conditions? 1 CH3(CH2)4CHO + Tollens' reagent 2 CH3(CH2)4CH3 + Br2 3 CH3C...
Use of the Data Booklet is relevant to this question. In which option do all three particles have the same electronic configuration and the same nu...
The shell of a chicken's egg makes up 5% of the mass of an average egg. An average egg has a mass of 50 g. Assume the egg shell is pure calcium car...
Phosphorus forms a compound with hydrogen called phosphine, PH₃. This compound can react with a hydrogen ion, H⁺. Which type of interaction occurs ...
Which solid has a simple molecular lattice?
Metaldehyde, (CH₃CHO)₄, is used as a solid fuel for camping stoves. The equation for the complete combustion of metaldehyde is shown. (CH₃CHO)₄(s) ...
In industry, copper metal is purified by electrolysis. Which changes occur to the masses of the electrodes and to the colour of the electrolyte dur...
Nitrogen dioxide, NO₂, exists in equilibrium with dinitrogen tetroxide, N₂O₄. 2NO₂(g) ⇌ N₂O₄(g) ∆H = −57 kJ mol⁻¹ Which conditions give th...
When a sample of HI is warmed to a particular temperature the equilibrium below is established. 2HI(g) ⇌ H₂(g) + I₂(g) At this temperature, it is f...
Photochromic glass, used for sunglasses, darkens when exposed to bright light and becomes more transparent again when the light is less bright. The...
The Boltzmann distribution below shows the distribution of molecular energies in a sample of a gas at a given temperature. [Figure] Which statement...
Use of the Data Booklet is relevant to this question. When 3.00 g of an anhydrous nitrate of a Group II metal is decomposed, 1.53 g of gas is produ...
What happens when a piece of magnesium ribbon is placed in cold water?
Compound X releases carbon dioxide gas and forms a white solid, Y, when it is heated. Neither X nor Y are soluble in water. Compound Y is used as a...
Use of the Data Booklet is relevant to this question. Which diagram correctly shows the electronegativity of the elements Na, Mg, Al and Si plotted...
The diagram shows a diaphragm cell used for the electrolysis of brine. Brine is concentrated aqueous sodium chloride. [Figure] A solution of sodium...
Which statement about the ammonium ion, NH₄⁺, is correct?
Carbon monoxide, CO, nitrogen dioxide, NO₂, and sulfur dioxide, SO₂, are all atmospheric pollutants. Which reaction concerning these compounds occu...
Chlorate(V) ions, ClO₃⁻, are produced in the redox reaction between chlorine and hot aqueous sodium hydroxide. Oxidation numbers can be used to hel...
Which alcohol will react with an acidified solution of potassium dichromate(VI) to produce a ketone containing six carbon atoms?
What is the major product formed when compound Q is warmed with excess HBr? [Figure]
Four students, W, X, Y and Z, made the following statements about alkanes and alkenes. W 'Bromine reacts with alkanes by electrophilic substitution...
Butanedioic acid may be synthesised in two steps from 1,2-dibromoethane. BrCH₂CH₂Br --step 1--> X --step 2--> HO₂CCH₂CH₂CO₂H Which reagents could b...
Which reaction would not give propene?
Terpinen-4-ol is one of the active ingredients in tea tree oil. [Figure] What is the molecular formula of terpinen-4-ol?
Use of the Data Booklet is relevant to this question. 2.40 g of propan-2-ol were mixed with excess acidified potassium dichromate(VI). The reaction...
The diagram shows the structure of compound X. [Figure] What is the product of the reaction between compound X and an excess of NaBH₄?
Lactic acid occurs naturally, for example in sour milk. [Figure] What is a property of lactic acid?
Citric acid is found in lemon juice. HO₂CCH₂C(OH)(CO₂H)CH₂CO₂H citric acid What is the volume of 0.4 mol dm⁻³ sodium hydroxide solution required to...
The drug Sirolimus is used to treat patients after kidney transplants. [Figure] On reaction with hot aqueous sodium hydroxide, Sirolimus produces a...
Use of the Data Booklet is relevant to this question. Which statements about the phosphide ion, ³¹P³⁻, and the chloride ion, ³⁵Cl⁻, are correct? 1 ...
Why does aluminium chloride, Al₂Cl₆, sublime at the relatively low temperature of 180°C? 1 The intermolecular forces between the Al₂Cl₆ molecules a...
Which statements are correct for all exothermic reactions? 1 ∆H for the reaction is negative. 2 On a reaction pathway diagram the products are show...
Which of these reactions are redox reactions? 1 6NO(g) + 4NH₃(g) → 5N₂(g) + 6H₂O(g) 2 2SO₂(g) + O₂(g) → 2SO₃(g) 3 SO₃(g) + H₂O(g) → H₂SO₄(g)
When added to water, which oxides will cause a change in the pH of the water? 1 SiO₂ 2 CaO 3 SO₂
Halogenated hydrocarbons have many uses. What have halogenated hydrocarbons been used for? 1 solvents 2 refrigerants 3 monomers in polymer manufacture
In which structures do the four carbon atoms labelled C lie in the same plane? 1 [Figure] 2 [Figure] 3 [Figure]
Which statements about 2-methylbutan-1-ol are correct? 1 It can give HCl(g) on reaction with PCl₅. 2 It can be oxidised to give an aldehyde. 3 It e...
Propanone and hydrogen cyanide react together by this mechanism. [Figure] Which statements about this mechanism are correct? 1 CN⁻ is an electrophi...