Cambridge Past Paper Questions
Browse 23,045questions from 25 years of O-Level & A-Level exams. Click any question to practice.
In this experiment you will determine the concentration of a sample of hydrochloric acid. You will do this by measuring the volume of hydrogen prod...
In this experiment you will determine the concentration of FA 2 by titration using aqueous sodium hydroxide. HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)...
FA 5 is a salt that contains two different cations and a single anion from those listed in the Qualitative Analysis Notes.
In this experiment you will determine the concentration of a solution of hydrochloric acid by titration with an alkali. FA 1 is a solution contain...
In this experiment you will determine the enthalpy change, ΔH, for the reaction shown. MgO(s) + CO2(g) → MgCO3(s) To do this, you will determine ...
An electrochemical cell is constructed using two half-cells. • an Sn⁴⁺/Sn²⁺ half-cell • an Al³⁺/Al half-cell
When CINO₂ reacts with NO an equilibrium is established. CINO₂(g) + NO(g) ⇌ NO₂(g) + CINO(g) In each CINO₂ molecule the nitrogen atom is bonded to ...
Phenylethanone is an important chemical with many uses. phenylethanone CH₃ O C
Silver sulfide, Ag₂S, is very insoluble in water.
The elements in Group 2 include magnesium, calcium, strontium and barium.
Manganese, chromium and ruthenium are all transition elements.
Proteins are natural polymers. When one particular protein is partially hydrolysed the product mixture includes tripeptide E. tripeptide E HO H N. ...
The structure of butamben is shown. butamben H₂N
An electrochemical cell is constructed using two half-cells. : a Br2/Br- half-cell an Mn³+/Mn2+ half-cell
Ammonium chloride, NH4Cl(s), dissolves in water to form an acidic solution. This is due to the dissociation of the ammonium ions. NH4+(aq) ⇌ H+(aq)...
The table shows some standard entropy data. substance | standard entropy, S° /J K⁻¹ mol⁻¹ PbO₂(s) | 77 PbO(s) | 69 O₂(g) | 205 Lead(IV) oxide, PbO₂...
Many copper compounds, such as CuSO4 and Cu(NO3)2 contain Cu2+ ions. Aqueous solutions of this ion contain the [Cu(H2O)6]2+ complex ion, in which w...
A polymer, P, can be made from the monomers benzene-1,4-dioyl chloride and benzene-1,3-diamine. Benzene-1,4-dioyl chloride has structure with a ben...
Butanedioic acid can be made in a three-step synthesis using ethane as the starting material. The reaction scheme shows: Ethane (CH₃-CH₃) undergoin...
The structure of nicotinamide is shown. It consists of a pyridine ring (a six-membered ring with one nitrogen atom) with an amide group (-CONH2) at...
An electrochemical cell is constructed using two half-cells. • an Sn4+/Sn2+ half-cell • an Al3+/Al half-cell
When CINO₂ reacts with NO an equilibrium is established. CINO2(g) + NO(g) ⇌ NO2(g) + CINO(g) In each CINO₂ molecule the nitrogen atom is bonded to ...
Phenylethanone is an important chemical with many uses. phenylethanone [Figure of phenylethanone structure]
The structure of butamben is shown. butamben [Figure of butamben structure]
Yttrium barium copper oxide, YBa₂Cu3O7, is a crystalline compound. You are to design an experiment in which YBa₂Cu3O7 is first synthesised and then...
The viscosity of a substance is a measure of how quickly the substance flows when it is subjected to a force such as gravity. The viscosity of a li...
Many organic reactions performed in the laboratory require heating under reflux. 4-nitromethylbenzene can be converted directly to 4-aminobenzaldeh...
Naphthalene, C₁₀H₈, is an aromatic organic compound that is a solid at room temperature and pressure. The enthalpy change of fusion, ∆Hfusion, of n...
What is the average oxidation number of sulfur in each compound?
An ore of manganese contains 4% by mass of MnO₂ and no other manganese compound. Which mass of manganese would be obtained from 1 tonne of this ore?
Which atomic orbitals are occupied in an atom of phosphorus?
The structure of compound A is shown. [Figure 4.1] Some of the carbon atoms in compound A have a tetrahedral arrangement of bonds. Some of the carb...
A white powder is known to be a mixture of magnesium oxide and aluminium oxide. 100 cm³ of 2 mol dm⁻³ NaOH(aq) is just enough to dissolve the alumi...
A graph of pV against T is shown for a fixed mass of gas. (p = pressure, V = volume and T = temperature in K.) [Figure 6.1] Which gas gives this gr...
A weather balloon is filled with 12.0 kg helium. The weather balloon reaches a height of 20 km, the pressure inside the balloon is 6000 Pa and the ...
Which pair of enthalpy changes will always share the same sign (i.e. both are always exothermic or both are always endothermic)?
Chlorine dioxide, ClO₂, reacts with sodium hydroxide in the reaction shown. 2ClO₂ + 2OH¯ → ClO₂⁻ + ClO₃⁻ + H₂O Which statement correctly describes ...
Sulfur dioxide and oxygen react to form sulfur trioxide. The reaction is reversible. 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) Kp = 2.96 × 10⁻⁹ Pa⁻¹ at 700 °C The ...
Ammonia is made by the Haber process. The reactants are nitrogen and hydrogen. N₂(g) + 3H₂(g) ⇌ 2NH₃(g) ΔH is negative What will increase the rate ...
Which row could refer to barium metal and barium hydroxide?
AgNO₃(aq) is added to a solution of a halide ion, X⁻(aq), and aqueous ammonia is then added. The ionic equations for the two reactions that occur a...
Due to their similar ionic radii, the reactions of lithium and magnesium and their corresponding compounds are very similar. Which statement about ...
Which statement about Group 17 elements and their compounds is correct?
Which substance, when warmed with aqueous ammonium chloride, would produce an alkaline gas?
Compound X is the oxide of a Period 3 element. Compound X reacts with water to give an acidic solution. A solution is prepared by reacting 0.100 g ...
The unsaturated hydrocarbon octa-1,3,5,7-tetraene, C₈H₁₀, can display geometric isomerism. octa-1,3,5,7-tetraene CH₂=CHCH=CHCH=CHCH=CH₂ How many is...