Cambridge Past Paper Questions
Browse 23,045questions from 25 years of O-Level & A-Level exams. Click any question to practice.
Benzene, C6H6, is an aromatic molecule.
A mixture of three organic compounds is separated by gas-liquid chromatography. The chromatogram obtained is shown in [Fig. 9.1]. The amount of eac...
Calcium chloride, CaCl₂, is an ionic solid. The values of some energy changes are shown in Table 1.1. Table 1.1 energy change | value/kJ mol⁻¹ latt...
Nitrogen monoxide, NO, reacts with ozone, O₃. NO(g) + O₃(g) → NO₂(g) + O₂(g) This reaction is first order with respect to both NO and O₃. At 298 K,...
Data should be selected from Table 3.1 in order to answer some parts of this question. Table 3.1 electrode reaction | E°/V Mg²⁺ + 2e⁻ ⇌ Mg | -2.38 ...
The value of the solubility product, Ksp, of iron(III) hydroxide, Fe(OH)₃, is given by the following expression. Ksp = [Fe³⁺][OH⁻]³ = 2.0 × 10⁻³⁹ m...
Copper is a transition element. It forms a wide variety of compounds.
An aqueous solution of cobalt(II) chloride is a pink colour due to the presence of [Co(H₂O)₆]²⁺ complex ions.
The structural and displayed formulae of three aromatic compounds, A, B and C, are shown in Fig. 7.1. [Figure 7.1] Compare the relative acidities o...
When answering this question it should be assumed that together all the hydrogen atoms in a benzene ring result in a single unsplit peak at δ = 7.2...
Tyrosine and lysine, shown in Fig. 9.1, are naturally occurring amino acids found in proteins. H₂N OH NH₂ HO tyrosine OH NH₂ lysine Fig. 9.1
Potassium chloride, KCl, and magnesium chloride, MgCl₂, are both ionic solids. Table 1.1 energy change va...
Data should be selected from Table 3.1 in order to answer some parts of this question. Table 3.1 electrode reaction ...
An aqueous solution of copper(II) sulfate is a blue colour due to the presence of [Cu(H₂O)₆]²⁺ complex ions.
The structure of compound P is shown in Fig. 7.1. P H2N / C-CH2- / C=O O-CH3 Benzene ring attached to -CH2- [Figure 7.1]
Benzene, C₆H₆, is an aromatic molecule.
A student attempts to determine the percentage by mass of magnesium chloride in the solid mixture containing magnesium chloride, MgCl2, and anhydro...
Charles' law states that for a fixed mass of gas at constant pressure, its volume is proportional to its absolute temperature. Most gases are non-i...
Potassium bromate(V) reacts with potassium bromide and sulfuric acid to form potassium sulfate, bromine and water according to the following equati...
Eggshells contain a high percentage by mass of calcium carbonate, CaCO₃. A student wants to find out what percentage of an eggshell is calcium carb...
It is possible to measure the rate at which potassium manganate(VII), KMnO₄(aq), Mᵣ = 158, diffuses through a permeable gel using the following met...
Which particle contains 8 protons, 9 neutrons and 10 electrons?
The second ionisation energy of oxygen is greater than the second ionisation energy of fluorine. Which factor explains this difference?
Zinc reacts with concentrated nitric acid giving three products only: zinc nitrate, an oxide of nitrogen and water. 3.0 moles of zinc react with 8....
Ammonium ions, NH4⁺, are formed when ammonia gas reacts with hydrogen chloride gas. Which statement about the changes that occur in this reaction i...
Two compounds of boron are sodium borohydride, NaBH4, and boron trifluoride, BF3. What are the shapes of the borohydride ion and the boron trifluor...
In an experiment, 0.100 mol of propan-1-ol is burnt completely in 12.0 dm³ of oxygen, measured at room conditions. What is the final volume of gas,...
At a temperature of 2500 K and a pressure of 1.00 × 10⁻³ Pa, a sample of 0.321 g of sulfur vapour has a volume of 2.08 × 10³ m³. What is the molecu...
In the structure of solid SiO2 each silicon atom is bonded to x oxygen atoms each oxygen atom is bonded to y silicon atoms each bond is a z type bo...
Nitric acid is made industrially by the oxidation of ammonia. The overall equation for the process is shown. equation 1 NH3 + 2O2 → HNO3 + H2O The ...
Chlorine reacts with sodium bromide. ½Cl2 + NaBr → NaCl + ½Br2 Which words correctly describe this reaction? 1 redox 2 displacement 3 disproportion...
The equation for the reaction between aqueous copper ions and aqueous iodide ions is as follows. 2Cu²⁺(aq) + 4I⁻(aq) → 2CuI(s) + I2(aq) What is the...
A mixture of the three gases, oxygen, nitrogen and argon, is at a total pressure of 500 kPa. There is a total of 1.2 moles of gas in the mixture. I...
0.200 mol of sulfur dioxide and 0.200 mol of oxygen are placed in a 1.00 dm³ sealed container. The gases are allowed to react until equilibrium is ...
The decomposition of hydrogen peroxide in the presence of MnO2 produces water and oxygen gas. 2H2O2(aq) → 2H2O(l) + O2(g) The volume of gas collect...
The diagram shows a gas syringe with a free-moving piston. The syringe contains gaseous hydrogen, gaseous iodine and gaseous hydrogen iodide at equ...
Which row gives the best description of the variations in the melting points and the first ionisation energies of the elements in Period 3 from sod...
X and Y are atoms of different elements in Period 3 of the Periodic Table. Neither X nor Y is argon. X is a non-metal. X has a greater atomic radiu...
Four mixtures are added to four separate 50 cm³ samples of water and stirred. Which mixture results in a solution with the highest pH?
The table gives some data for compounds of two elements from Group 2 of the Periodic Table. Element calcium has decomposition temperature of carbon...
Q is a mixture of two compounds of Group 2 elements. Q undergoes thermal decomposition to produce a white solid and only two gaseous products. One ...
Iodine has a higher melting point than chlorine. What is the reason for this?
When concentrated sulfuric acid is added to solid sodium chloride, HCl is formed but not Cl2. When concentrated sulfuric acid is added to solid sod...
NaOH(aq) is added to NH4Cl(aq). The mixture is warmed. The gas that is produced turns damp red litmus paper blue. Which row is correct?
Artemisinin is a powerful anti-malarial drug. [Figure of artemisinin structure] How many chiral centres are there in each molecule of artemisinin?
Which row shows the correct name and classification of the halogenoalkane shown? CH3(CH2)2CBr(CH3)CH2CH3