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.
Three substances have the physical properties shown in the table. substance melting point /°C boiling point /°C conductivity (solid) conductivity (...
Calcium forms an ionic compound with carbon, called calcium carbide. The oxidation number of carbon in calcium carbide is –1. Calcium carbide is re...
Hess' law may be used to determine enthalpy changes using average bond energies, as shown in the diagram. [Figure showing U, V, W for reactants, pr...
The process of electrolysis can be used to purify copper, and to extract aluminium from an aluminium oxide/cryolite mixture. What are the reactions...
Hydrogen can be obtained by reacting methane with steam. CH4(g) + H2O(g) ⇌ CO(g) + 3H2(g) ΔH° = +210 kJ mol-1 Which conditions of pressure and temp...
Nitrogen monoxide reacts with oxygen in a reversible reaction according to the equation shown below. 2NO(g) + O2(g) ⇌ 2NO2(g) The partial pressures...
The decomposition reaction SF6(g) → SF4(g) + F2(g) can be described by the reaction pathway diagram shown. [Figure showing energy profile with X an...
Which row correctly describes what happens when the temperature of a chemical reaction is decreased?
Which property decreases on descending Group II?
Use of the Data Booklet is relevant to this question. The reaction between aluminium powder and anhydrous barium nitrate is used as the propellant ...
Which chloride of a Period 3 element dissolves in water to form a solution with a pH of 7?
Use of the Data Booklet is relevant to this question. Which row correctly compares the electrical conductivity and first ionisation energy of magne...
Use of the Data Booklet is relevant to this question. Brine is concentrated aqueous sodium chloride. In the commercial electrolysis of brine, the p...
A student observed the reactions when sodium chloride and sodium iodide were each reacted separately with concentrated sulfuric acid and with conce...
A white powder is a mixture of sodium chloride and sodium iodide. It is dissolved in water in a test-tube. Excess aqueous silver nitrate is added t...
Use of the Data Booklet is relevant to this question. 4.70 g of an ammonium salt is heated with excess aqueous sodium hydroxide. The volume of ammo...
Which ester is formed when the alcohol CH3CH2OH is reacted with CH3CH2CH2CO2H?
Which compound shows optical isomerism?
Compound Q can be made from propanone. [Figure of compound Q, 4-methylpent-3-en-2-one] Which types of reaction will Q undergo?
The depletion of the ozone layer in the upper atmosphere reduces the Earth's natural protection from harmful ultraviolet radiation. Which compound ...
Compound X has been investigated for use as an artificial sweetener. [Figure of compound X, a glucose derivative with two -Cl and multiple -OH grou...
The compounds below are all produced by plants. Each compound is warmed with acidified potassium dichromate(VI). Which compound will give a differe...
What is the mechanism for the reaction of ethanal, CH3CHO, with hydrogen cyanide, HCN, in the presence of a base?
Menthol and menthone are both found in peppermint oil. [Figure of menthol and menthone] Which statement about these compounds is correct?
What is the skeletal formula of 2-methylpentan-1-ol?
The structure of aspartame, which is used as an artificial sweetener, is shown. [Figure of aspartame structure with bonds 1 and 2 labelled] If aspa...
The relative molecular mass, Mr, of a particular sample of chlorine is 72.0. Which properties of the atoms in this sample will be the same for all ...
Which of the following influence the size of the ionisation energy of an atom? 1 the amount of shielding by the inner electrons 2 the charge on the...
Which equations can apply to an ideal gas? [p = pressure, V = volume, M = molar mass, ρ = density, c = concentration, R = gas constant, T = tempera...
Which statements about calcium and strontium compounds are correct? 1 When calcium oxide and strontium oxide are added to water they both produce a...
Which descriptions of the ammonium ion are correct? 1 It contains ten electrons. 2 It has a bond angle of 109.5°. 3 It has only three bonding pairs...
Compound Q is obtained by adding H2O across the double bond in compound P. [Figure of compound P, 1,2-dimethylcyclohexene] [Figure of compound Q, 1...
X is an organic compound. X gives a precipitate with aqueous silver nitrate. Some or all of this precipitate remains undissolved when excess dilute...
Which compounds, on heating with excess concentrated sulfuric acid, produce only one product with molecular formula C7H10? 1 [Diagram of 3-methylcy...
Compound Z is heated with concentrated acidified potassium manganate(VII). This produces an equimolar mixture of CO2 and CH3COCH2CH2CH(COCH3)CH2CO2...
The molecules of a gas at a constant temperature, T₁, have the distribution of molecular energies shown in the diagram. [Figure showing molecular e...
The diagram shows the pathways of a reaction, with and without a catalyst. [Figure showing energy profile diagram] Which letter represents the over...
People are advised to eat less than 6.00 g of salt (sodium chloride) per day for health reasons. Which mass of sodium is present in 6.00 g of sodiu...
When copper reacts with a 50% solution of nitric acid, nitrogen monoxide is evolved and a blue solution results. The balanced equation for this rea...
What is the electronic configuration of an isolated Ni²⁺ ion?
When solid aluminium chloride is heated, Al₂Cl₆ is formed. Which bonding is present in Al₂Cl₆?
In which hydride is the H-X-H bond angle the smallest?
In an experiment, a sample of a pure gas is put into a gas syringe at a temperature of 300K and pressure of 16kPa. The gas is compressed until the ...
In a calorimetric experiment 1.60 g of a fuel are burnt. 45.0% of the energy released is absorbed by 200 g of water. The temperature of the water r...
Nitrogen reacts with hydrogen to produce ammonia. N₂(g) + 3H₂(g) ⇌ 2NH₃(g) A mixture of 2.00 mol of nitrogen, 6.00 mol of hydrogen and 2.40 mol of ...
Lithium reacts with nitrogen at room temperature to form solid Li₃N. Three vessels of equal volume are connected by taps, A and B, as shown. [Figur...
The graph below shows the variation of the first ionisation energy with proton number for some elements. The letters used are not the usual symbols...
Which element shows the greatest tendency to form covalent compounds?
Elements Y and Z are both in Period 3. When the chloride of Y is added to water, it reacts and a solution of pH 2 is produced. When the chloride of...
When chlorine reacts with hot aqueous sodium hydroxide, two chlorine-containing ions are formed. One of these is the chloride ion, Cl⁻. What is the...