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.
Manganese(IV) oxide, MnO2, acts as a heterogeneous catalyst in the decomposition of hydrogen peroxide, H2O2.
The rate of reaction between 2-chloro-2-methylpropane, (CH3)3CCl, and methanol is investigated. When a large excess of methanol is used, the overal...
The ligand bipyridine consists of two pyridine rings. Pyridine, C₅H₅N, and benzene, C₆H₆, have similar planar, cyclic structures.
The condensation polymers, polyanhydride and polyester, are formed by similar methods. The repeat unit for a polyanhydride is shown in Fig. 5.2. [F...
Asparagine is an amino acid that contains a chiral carbon atom and displays stereoisomerism. Separate samples of asparagine are dissolved in CDCl₃ ...
Procaine is used as an anaesthetic in medicine. It can be synthesised from methylbenzene in five steps as shown in Fig. 7.1. [Figure 7.1 showing sy...
The solubility of the Group 2 hydroxides increases down the group. Explain this trend.
Explain why transition elements have variable oxidation states.
Define first electron affinity.
Calcium carbonate decomposes on heating. CaCO3(s) → CaO(s) + CO2(g) Table 4.1 shows the values of the Gibbs free energy change, AG°, for this react...
Complete Table 5.1 to predict the substance liberated at each electrode during electrolysis of the indicated electrolyte with inert electrodes. [Fi...
The reagent and conditions required for the nitration of benzene, benzoic acid and phenol are shown in Table 6.1. [Figure Table 6.1] Concentrated H...
State the uses of TMS and D₂O in NMR spectroscopy.
Compare the relative acidities of ethanol, ethanoic acid, chloroethanoic acid and phenol. Explain your reasoning.
The structure of cyclohexylamine is shown in Fig. 9.1. [Figure cyclohexylamine, Fig. 9.1]
Answer all the questions in the spaces provided. (d) (i) The equation for the formation of a gaseous sulfate ion is shown. S(s) + 2O2(g) + 2e¯ → S...
(e) Aqueous manganese(II) ions show similar chemical properties to aqueous copper(II) ions when reacted separately with NaOH(aq) and with concentra...
The rate of reaction between 2-chloro-2-methylpropane, (CH₃)₃CCl, and methanol is investigated. When a large excess of methanol is used, the overal...
(d) The ligand bipyridine consists of two pyridine rings. Pyridine, C₅H₅N, and benzene, C₆H₆, have similar planar, cyclic structures. [Figure 4.2]...
(e) Acyl chlorides react with sodium carboxylates to form acid anhydrides as shown in Fig. 5.1. [Figure 5.1] The condensation polymers, polyanhyd...
A student plans an investigation to find the molar ratio of the reaction between sodium chloride, NaCl, and a lead compound. The student is provide...
A student plans to study the rate of hydrolysis of 2-bromo-2-methylpropane. [Diagram showing reaction] As the concentration of 2-bromo-2-methylprop...
A student plans an experiment to find a value for the molar volume, Vm, of hydrogen gas at room conditions. Hydrogen gas is formed when magnesium r...
In a neutral solution, aqueous potassium iodide acts as a catalyst for the decomposition of aqueous hydrogen peroxide. 2H2O2(aq) → 2H2O(l) + O2(g) ...
A student plans to study the rate of hydrolysis of 2-bromo-2-methylpropane. [Chemical reaction diagram with structures] As the concentration of 2-b...
When chlorine gas is analysed in a mass spectrometer 35Cl+ ions are detected. Which row is correct?
Which species is a free radical?
If 1 mole of hexane combusts in an excess of oxygen, how many moles of products are formed?
Separate samples, each of mass 1.0 g, of the compounds listed are treated with an excess of dilute acid. Which compound releases the largest amount...
Which statement about the Cl–N=O molecule is correct?
Which row is correct?
The volume of a vessel is 1.20 × 10⁻³ m³. It contains pure argon at a pressure of 1.00 × 10⁵ Pa, and at a temperature of 25.0 °C. Under these condi...
Nitrogen monoxide is rapidly oxidised to nitrogen dioxide. 2NO(g) + O₂(g) → 2NO₂(g) Nitrogen dioxide can then dimerise to form dinitrogen tetroxide...
LiAlH₄ contains AlH₄⁻ ions in which aluminium has an oxidation state of +3. LiAlH₄ reacts with water, as shown. LiAlH₄ + 4H₂O → 4H₂ + LiOH + Al(OH)...
The vanadium salt, VOSO₄, is soluble in water and reacts readily with powdered manganese in dilute sulfuric acid. The equation for the reaction is ...
In which equilibrium will an increase in pressure at constant temperature increase the yield of the products on the right-hand side of the equation?
Hydrogen iodide is added to an evacuated reaction vessel. The vessel is sealed and warmed. A decomposition reaction occurs. Hydrogen and iodine are...
The equations for two reactions are shown. reaction X 2NOBr ⇌ 2NO + Br₂ reaction Y 2NOCl → 2NO + Cl₂ The two reactions have similar reaction mechan...
The diagram shows the Boltzmann distribution of energies in a gas. The gas can take part in a reaction with an activation energy, Ea. The gas is ma...
L, M and N are three different elements from Period 3 of the Periodic Table. L is the element whose atoms have three unpaired electrons in its 3p s...
In reactions 1 and 2, X represents an element in Period 3. In each reaction, X is forming a product where X is in its highest oxidation state. reac...
Sodium, magnesium, aluminium, silicon and phosphorus are all elements in Period 3 of the Periodic Table. Three statements about the oxides and chlo...
The table compares calcium with barium and calcium carbonate with barium carbonate. Which row is correct?
Solutions P and Q each contain a different Group 2 ion at the same concentration. One contains Mg²⁺ and the other contains Ba²⁺. Tests are carried ...
J dissolves in water to give an aqueous solution K. K gives a dense white precipitate when aqueous silver nitrate is added. When heated with aqueou...
The equation shows a reaction that occurs between carbon monoxide and nitrogen monoxide in a catalytic converter. 2CO(g) + 2NO(g) → 2CO₂(g) + N₂(g)...
Which compound has the molecular formula C₆H₁₀O?
The general formula for a non-cyclic alcohol is CnH₂n+₁OH. How many different structural isomers are there for n = 3 and n = 4?
Compound X, C₅H₁₀O₃, has one chiral carbon atom per molecule. Compound X produces bubbles with Na but not with Na₂CO₃. Which formula could represen...
Ethane reacts with an excess of chlorine in the presence of ultraviolet light to form a mixture of products. How many of these products contain two...