OCR A-Level Chemistry Periodic table, elements and physical chemistry (01), June 2023
Every question from OCR A-Level Chemistry Periodic table, elements and physical chemistry (01), June 2023 (H432): 22 questions, 100 marks, each with its mark scheme and topic.
- Question 1 1 mark
Determine which given sample contains the greatest number of molecules by calculating the moles for each option.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 2 1 mark
Determine the formula of an oxide of manganese given the mass reduced by hydrogen and the mass of water formed.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 3 1 mark
Calculate the number of hydrogen atoms in 2.50 g of pharmacolite, CaHAsO4•2H2O given its Mr is 216.0
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 4 1 mark
Calculate the concentration of the resulting solution after mixing specified volumes and concentrations of hydrochloric acid and sodium hydroxide.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 5 1 mark
Identify which compound has polar molecules from the given multiple-choice options.
Module 2: Foundations in chemistry · 2.2 Electrons, bonding and structure
- Question 6 1 mark
Identify which element has the largest third ionisation energy from a choice of four options.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · 2.2 Electrons, bonding and structure · 3.1 The periodic table
- Question 7 1 mark
Determine the half-life of a first-order reaction with respect to reactant X when the initial concentration is doubled from 1.0 mol dm⁻³ to 2.0 mol dm⁻³.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH
- Question 8 1 mark
Identify which ionic compound requires the most energy to convert one mole into its gaseous ions based on lattice enthalpy trends.
Module 5: Physical chemistry and transition elements · 5.2 Energy
- Question 9 1 mark
Calculate the standard entropy change for the formation of 1 mol of SO3(l) from SO2(g) and O2(g) using provided standard entropy values.
Module 5: Physical chemistry and transition elements · 5.2 Energy
- Question 10 1 mark
Calculate the percentage dissociation of a methanoic acid solution given its concentration and acid dissociation constant Ka.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH
- Question 11 1 mark
Identify the correct observations when dilute hydrochloric acid is added to aqueous potassium carbonate and aqueous silver nitrate.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Practical Activity Groups · PAG 4: Qualitative analysis of ions · 3.1 The periodic table
- Question 12 1 mark
Identify the correct statement about a lithium-ion cell given the standard electrode potentials of its half-cells.
Module 5: Physical chemistry and transition elements · 5.2 Energy
- Question 13 1 mark
Identify which of the listed substances (C2H6, H2O, Si) have induced dipole-dipole interactions (London forces) in the solid state.
Module 2: Foundations in chemistry · 2.2 Electrons, bonding and structure
- Question 14 1 mark
Identify the correct statements regarding the anti-cancer complex cisplatin, Pt(NH3)2Cl2, involving bond angles, oxidation number, and stereoisomerism.
Module 5: Physical chemistry and transition elements · 5.3 Transition elements
- Question 15 1 mark
Assess statements regarding the redox, temperature dependence, and entropy change for the thermal decomposition equilibrium of chlorine trifluoride.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · 2.1 Atoms and reactions · 3.2 Physical chemistry · 5.2 Energy
- Question 16 10 marks
Complete a Born-Haber cycle for barium iodide, calculate its lattice enthalpy using thermodynamic data, and explain trends in the first and second ionisation energies of Group 2 elements.
Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · 3.1 The periodic table · 3.2 Physical chemistry · 5.2 Energy
- Question 17 6 marks
Explain how reaction orders can be determined from experimental initial rates data, and determine the rate equation and rate constant for the reaction.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH
- Question 18 11 marks
Calculate enthalpy changes of combustion using calorimetry and Hess's law, and determine entropy change, minimum temperature of feasibility, and enthalpy change from a Gibbs free energy graph.
Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · Practical Activity Groups · 3.2 Physical chemistry · 5.2 Energy · PAG 3: Enthalpy determination
- Question 19 13 marks
Calculate the value of Kp for the equilibrium system involving NO2 and N2O4, explain the effect of changing temperature and pressure on the equilibrium yield, and determine the molar mass and molecular formula of an oxide of nitrogen formed from N2O4.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · 2.1 Atoms and reactions · 3.2 Physical chemistry
- Question 20 21 marks
Calculate pH and Ka values, write equations, and explain properties involving acids, bases, ionic product of water, and buffer solutions.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · 2.1 Atoms and reactions · 3.1 The periodic table · 5.1 Rates, equilibrium and pH
- Question 21 10 marks
Determine the concentration of iron(II) ions in a river water sample using titration with potassium manganate(VII) and explain the steps in modifying the experiment to determine total iron using redox electrode potentials.
Module 2: Foundations in chemistry · Module 5: Physical chemistry and transition elements · Practical Activity Groups · PAG 2: Acid-base titration · 2.1 Atoms and reactions · 5.2 Energy
- Question 22 14 marks
Explain d-block and transition elements using electron configurations, describe precipitation and ligand substitution reactions for copper or chromium, determine complex ion properties, and construct a redox equation for dichromate and vanadium(III).
Module 5: Physical chemistry and transition elements · 5.3 Transition elements