Cambridge Past Paper Questions
Browse 23,045questions from 25 years of O-Level & A-Level exams. Click any question to practice.
The graph shows a sketch of the first ionisation energies of six successive elements in the Periodic Table. The letters are not the symbols of the ...
Carbon and silicon are elements in Group 14.
Calcium and its compounds have a large variety of applications.
Cyclohexane is a colourless liquid used in industry to produce synthetic fibres. A reaction scheme involving cyclohexane is shown. [Figure 4.1: Rea...
Quantitative Analysis Read through the whole method before starting any practical work. Where appropriate, prepare a table for your results in the ...
Qualitative Analysis Where reagents are selected for use in a test, the name or correct formula of the element or compound must be given. At each s...
Answer all the questions in the spaces provided.
The apparatus shows a cell which can be used to determine a value of the Avogadro constant, L. [Figure with diagram of an electrolytic cell with si...
Cumin is a spice used to flavour food. Two compounds responsible for its flavour are cuminaldehyde and cuminyl alcohol. [Figure showing structures ...
Two molecules of compound F react together under suitable conditions to form compound G. Some information about compounds F and G is given. • The m...
When a solute is added to a solvent the freezing point of the solution is lower than that of the pure solvent. The lowering of freezing point is v...
‘Lawn sand’ is spread over the grass in gardens to reduce the growth of moss. Lawn sand is a mixture of sand and iron(II) sulfate crystals, FeSO₄.7...
The Boltzmann distribution is shown for a sample of gas at an initial temperature, T1. [Figure 1.1] The sample of gas was heated to temperature, T2...
A 3.7 g sample of copper(II) carbonate is added to 25 cm³ of 2.0 mol dm⁻³ hydrochloric acid. Which volume of gas is produced under room conditions?
Which statement about a 3p orbital is correct?
The eight species that follow all have covalent bonds. In which pair do the species have different shapes from each other?
Histidine is an amino acid. [Figure 5.1] What are the approximate bond angles 1, 2, and 3?
A sample of gas occupies 240 cm³ at 37 °C and 100 kPa. How many moles of gas are present in the sample?
P, Q and R represent three different structures of an element. [Figure 7.1] Which structures are giant molecular?
The standard enthalpy changes of combustion of carbon, hydrogen and methanol are shown. C(s) + O₂(g) → CO₂(g) ∆Hᶜ = −394 kJ mol⁻¹ H₂(g) + ½O₂(g) → ...
The equation for a chemical reaction is shown. All substances are in their standard states. XeF₆ + 3H₂O → XeO₃ + 6HF Which statement describes the ...
Acidified potassium manganate(VII) reacts with iron(II) ethanedioate, FeC₂O₄. The reactions taking place are shown. MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O...
When copper is added to a solution of silver ions, the following equilibrium is established. Cu(s) + 2Ag⁺(aq) ⇌ Cu²⁺(aq) + 2Ag(s) Kᶜ = 1.0 × 10⁵ Wh...
X, Y and Z are elements in Period 3 of the Periodic Table. The results of some experiments carried out with compounds of these elements are shown. ...
A solid Period 3 element, Q, is reacted with oxygen gas. Compound R is formed. When R is added to water the pH decreases. What could be the empiric...
Metal T reacts with water to produce a colourless solution. A white precipitate is produced when this colourless solution is mixed with aqueous sul...
When calcium nitrate thermally decomposes, oxygen is one of the products. Which volume of oxygen is produced under room conditions when 0.50 mol of...
L, M and N are Group 2 metals. L reacts more vigorously with dilute hydrochloric acid than N does. M(OH)₂ is more soluble than N(OH)₂. What could b...
The table shows some reactions of a white compound, G. [Figure 17.1] What could be the identity of G?
Under standard conditions, which statement is correct?
Ammonia, NH₃, and hydrazine, NH₂NH₂, are two compounds of nitrogen, N₂. Which statement is correct?
How many structural isomers are there of trichloropropane, C₃H₅Cl₃?
Compound L has the molecular formula C₁₀H₁₆. A sample of L reacted with an excess of hot, concentrated, acidified potassium manganate(VII). Compoun...
Many reactions take place in the engine and catalytic converter of a car. Which pair of substances is produced both by the reactions in a car engin...
Structural isomerism and stereoisomerism should be considered when answering this question. 2-bromopentane is heated with an excess of ethanolic so...
Bromopropane reacts with water as shown. CH₃CH₂CH₂Br + H₂O → CH₃CH₂CH₂OH + HBr Which statement is correct?
Which product is formed when 3-methylpentane-1,3,4-triol is heated under reflux with an excess of acidified potassium dichromate(VI)?
Menthol is a naturally occurring alcohol. [Figure 26.1] When menthol is heated with concentrated sulfuric acid it reacts. The products formed inclu...
Structural isomerism only should be considered when answering this question. All the isomeric alcohols with the molecular formula C₅H₁₂O are added ...
When compound X is heated with Cr₂O₇²⁻/H⁺, a colour change from orange to green is observed. Two tests are carried out on the organic product of th...
1 mole of each of the following four compounds is reacted separately with: • an excess of sodium • an excess of sodium carbonate. Which compound pr...
An infra-red spectrum shows a broad peak at 3000 cm⁻¹ and a strong peak at 1710 cm⁻¹. Which substance could have produced this spectrum?
In an experiment, 10 cm³ of an organic compound, J, in the gaseous state is reacted with an excess of oxygen. Steam, 20 cm³ of carbon dioxide and 5...
In which pairs do both species have the same number of unpaired electrons in p orbitals? 1 O and Cl⁺ 2 F⁺ and Ga 3 N and Kr³⁺
In which reactions is the underlined element or compound reduced? 1 NaClO + H₂O₂ → O₂ + NaCl + H₂O 2 2NH₃ + 2Li → 2LiNH₂ + H₂ 3 3CH₃CH₂OH + K₂Cr₂O₇...