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.
Carboplatin and satraplatin are used as anticancer drugs instead of cisplatin. [Figure 5.1]
Fumaric acid is a naturally occurring dicarboxylic acid. [Figure 6.1]
Proline (Pro) is a naturally occurring amino acid. [Figure 7.1]
Zinc metal reacts with aqueous copper(II) sulfate. Zn(s) + CuSO₄(aq) → Cu(s) + ZnSO₄(aq) The enthalpy change of this reaction, ΔΗ, can be determine...
Ethanedioic acid is a white crystalline solid. If excess aqueous potassium hydroxide, KOH(aq), is added to dilute ethanedioic acid, H₂C₂O₄(aq), ful...
The first ionisation energy of potassium, K, is 418 kJ mol⁻¹. The first ionisation energy of strontium, Sr, is 548 kJ mol⁻¹. Which statement helps ...
What is the electronic configuration of Mg²⁺?
Compound X contains the elements C, H and O only. 2.00 g of X produces 4.00 g of carbon dioxide and 1.63 g of water when completely combusted. What...
For which molecule is the dipole moment zero?
Which dot-and-cross diagram is correct for Al₂Cl₆? [Figure 5.1]
The boiling points of some hydrogen halides are shown. [Figure 6.1] What is the explanation for the trend in boiling point for the hydrogen halides...
Elements X, Y and Z are all in the first two periods of the Periodic Table. Their Pauling electronegativity values, EN, are shown. [Figure 7.1] Sub...
The equation for reaction 1 is shown. reaction 1 C₆H₁₂O₆ → 2CO₂ + 2C₂H₅OH ΔH/kJ mol⁻¹ C₆H₁₂O₆ a C₂H₅OH b What is the correct expression for the ent...
Nitrogen monoxide is an atmospheric pollutant that is formed inside car engines by an endothermic reaction between nitrogen and oxygen. N₂(g) + O₂(...
Two half-equations are shown. MnO₄⁻ + 2H₂O + 3e⁻ → MnO₂(s) + 4OH⁻ 2OH⁻ + SO₃²⁻ → SO₄²⁻ + H₂O + 2e⁻ The equation for the reaction between manganate(...
Hydrogen peroxide, H₂O₂, decomposes to form water and oxygen. The reaction is catalysed by bromide ions. step 1 2Br⁻(aq) + H₂O₂(aq) + 2H⁺(aq) → 2H₂...
Hydrogen and iodine react to form hydrogen iodide in an exothermic reaction. The equation is shown. H₂(g) + I₂(g) ⇌ 2HI(g) A 1 m³ reaction vessel c...
Diethylzinc, (C₂H₅)₂Zn, is added to NaOH(aq). Two reactions occur. reaction 1 (C₂H₅)₂Zn + H₂O → ZnO + 2C₂H₆ reaction 2 H₂O + ZnO + 2OH⁻ → Zn(OH)₄²⁻...
Which statement about atoms and molecules is correct?
The Boltzmann distribution for one mole of a gas at temperature T is shown. [Figure 15.1] One mole of the same gas is added, and the gas remains at...
In the reaction shown, the concentrations of both X and Y are reduced to half of their original values whilst keeping the total volume of the solut...
A student investigated the chloride of a Period 3 element. This is what the student wrote down as a record. "The compound was a white crystalline s...
The elements in Period 3 and their compounds show trends across the period from sodium to chlorine. Which row is correct? [Figure 18.1]
The table shows the melting points of SiO₂ and P₄O₆. [Figure 19.1] Which statement explains the difference between the melting points of SiO₂ and P...
Equal masses of CaCO₃, Ca(NO₃)₂, BaCO₃ and Ba(NO₃)₂ are thermally decomposed. The volume of gas produced in each experiment is measured under the s...
Which row gives correct comparisons between the solubilities of calcium hydroxide and barium hydroxide and the thermal stabilities of calcium carbo...
Which statement relating to the elements in Group 17 and their compounds is correct?
An excess of chlorine was bubbled into 100 cm³ of hot 6.0 mol dm⁻³ sodium hydroxide. How many moles of sodium chloride would be produced in the rea...
The product of the Contact process is Z. Which reaction or process leads to the formation of a gas that can neutralise an aqueous solution of Z?
When ammonia, NH₃, is dissolved in water, a small concentration of ammonium ions, NH₄⁺, is formed. Which row is correct? [Figure 25.1]
In this question, alkenes and cyclic alkanes should be considered. How many structural isomers of C₄H₈ are there?
Which compound will decolourise Br₂(aq)?
Alkenes react with aqueous hydrogen bromide. The reaction proceeds via an intermediate carbocation. The more stable the intermediate, the faster th...
The diagram shows the structures of three halogenoalkanes. [Figure 30.1] P, Q and R can all be hydrolysed. Which row is correct? [Figure 30.2]
A sample of 2.30 g of ethanol is mixed with an excess of aqueous acidified potassium dichromate(VI). The reaction mixture is boiled under reflux fo...
The structure of tartaric acid is shown. [Figure 32.1] Four moles of substance X react with one mole of tartaric acid. What could be substance X?
Which compound gives both: an orange precipitate with 2,4-DNPH reagent and a yellow precipitate with alkaline I₂(aq)?
A student suggests two uses of LiAlH₄. reaction 1 CH₃-CH=CH₂ LiAlH₄→ CH₃-CH₂-CH₃ reaction 2 CH₃CO₂H LiAlH₄→ CH₃CH₂OH Which reactions would give the...
Compound X contains a single ester group. X contains 27.6% by mass of oxygen. Which pair of products could be produced by the hydrolysis of X?
What is the least number of carbon atoms in a non-cyclic alkane molecule that has a chiral centre?
A molecule of a polymer contains the sequence shown. [Figure 37.1] Which monomer could produce this polymer by addition polymerisation?
Compound Y is heated with a mild oxidising agent. One of the products of the reaction reacts with hydrogen cyanide forming 2-hydroxybutanenitrile. ...
The diagrams show the structures of lycopene and β-carotene. [Figure 39.1] When lycopene is converted into β-carotene, what is the gain or loss of ...
Which diagram shows the infrared spectrum of a compound that contains both a C=O and an O-H group? [Figure 40.1]
Fig. 1.1 shows how first ionisation energies vary across Period 2. [Figure 1.1]
Some oxides of elements in Period 3 are shown. Na₂O Al₂O₃ P₄O₆ P₄O₁₀ SO₂ SO₃
The hydrogen halides HCl, HBr and HI are all colourless gases at room temperature.
Compounds J and K are found in plant oils. [Figure 4.1]
You will determine the concentration of sulfuric acid by reaction with a known concentration of sodium hydroxide using a thermometric method. The e...
Solid sodium sulfite is often provided as the hydrated salt, Na2SO3•xH2O, where x is an integer. You will determine x by using a solution of this s...