OCR A-Level Chemistry Periodic table, elements and physical chemistry (01), June 2024
Every question from OCR A-Level Chemistry Periodic table, elements and physical chemistry (01), June 2024 (H432): 22 questions, 100 marks, each with its mark scheme and topic.
- Question 1 1 mark
Identify the correct arrangement of electrons in the p-orbitals of an oxygen atom.
Module 2: Foundations in chemistry · 2.2 Electrons, bonding and structure
- Question 2 1 mark
Identify the type of bonding or intermolecular forces responsible for water's anomalous properties such as high melting/boiling points and ice being less dense than water.
Module 2: Foundations in chemistry · 2.2 Electrons, bonding and structure
- Question 3 1 mark
Identify which chemical process for producing iron has the most sustainable atom economy.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 4 1 mark
Identify which compound of magnesium can be used as an antacid from the given options.
Module 3: Periodic table and energy · 3.1 The periodic table
- Question 5 1 mark
Identify the statement that explains the trend in boiling points down the halogens group.
Module 3: Periodic table and energy · 3.1 The periodic table
- Question 6 1 mark
Identify which given equation does not represent a disproportionation reaction.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · 2.1 Atoms and reactions · 3.1 The periodic table
- Question 7 1 mark
Calculate the enthalpy change of neutralisation when sulfuric acid reacts with potassium hydroxide, given the volume, concentration, and energy given out.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · 2.1 Atoms and reactions · 3.2 Physical chemistry
- Question 8 1 mark
Identify how a catalyst affects the activation energy and the proportion of molecules with energy greater than the activation energy.
Module 3: Periodic table and energy · 3.2 Physical chemistry
- Question 9 1 mark
Calculate the activation energy for a reaction given the gradient of a ln(k) versus 1/T graph.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH
- Question 10 1 mark
Identify the correct rate-concentration graph for a zero-order reaction with respect to a reactant.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH
- Question 11 1 mark
Identify the point on a concentration-time graph where dynamic equilibrium is reached for the reaction between hydrogen and iodine to form hydrogen iodide.
Module 3: Periodic table and energy · 3.2 Physical chemistry
- Question 12 1 mark
Identify which solution can be added to ethanoic acid to make a buffer solution.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH
- Question 13 1 mark
Identify the formula of a salt based on its test results with sodium hydroxide and barium nitrate solutions.
Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · Practical Activity Groups · 3.1 The periodic table · 5.3 Transition elements · PAG 4: Qualitative analysis of ions
- Question 14 1 mark
Identify the correct statements about chlorine and its electron configuration when it reacts in redox reactions.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · 2.2 Electrons, bonding and structure · 3.1 The periodic table
- Question 15 1 mark
Identify which statements about elements in the periodic table are correct regarding atomic number, group properties, and transition element catalysts.
Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · 3.1 The periodic table · 5.3 Transition elements
- Question 16 17 marks
Calculate enthalpy changes, Gibbs free energy, activation energy on profiles, and lattice enthalpies for hydrogen peroxide decomposition and manganese oxide formation.
Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · 3.2 Physical chemistry · 5.2 Energy · 5.3 Transition elements
- Question 17 7 marks
Explain why the gradient decreases over time using collision theory, determine the order of reaction with respect to crystal violet, find the rate of reaction at three minutes, and calculate the rate constant.
Module 5: Physical chemistry and transition elements · Practical Activity Groups · PAG 9: Rates of reaction – continuous monitoring method · 5.1 Rates, equilibrium and pH
- Question 18 12 marks
Calculate Kp for the decomposition of sulfur trioxide, explain the effect of temperature and pressure on the equilibrium, and explain the shapes and polarity of sulfur dioxide and sulfur trioxide molecules.
Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · Module 2: Foundations in chemistry · 3.2 Physical chemistry · 5.1 Rates, equilibrium and pH · 2.2 Electrons, bonding and structure
- Question 19 11 marks
Calculate the pKa of chloroethanoic acid and determine the concentration of ethanoic acid using a titration curve and indicator selection.
Module 5: Physical chemistry and transition elements · Practical Activity Groups · PAG 2: Acid-base titration · PAG 11: pH measurement · 5.1 Rates, equilibrium and pH
- Question 20 11 marks
Discuss the uses and displacement reactions of halogens, determine a reaction mechanism step and rate equation, and explain the melting points of Period 3 elements in terms of bonding and structure.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · 2.2 Electrons, bonding and structure · 3.1 The periodic table · 3.2 Physical chemistry · 5.1 Rates, equilibrium and pH
- Question 21 15 marks
Write equations and identify reaction types for barium compounds, calculate the mass of potassium iodate in a tablet via titration, draw a standard electrode potential measurement diagram for an Fe3+/Fe2+ half-cell, and construct cell equations for lithium-ion and hydrogen-oxygen fuel cells.
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 · 5.2 Energy
- Question 22 12 marks
Deduce transition metal electron configurations, formulas of cobalt complexes and precipitates, determine a complex ion formula from molar mass, and evaluate blood pH using ligand substitution and acid-base buffer calculations.
Module 2: Foundations in chemistry · Module 5: Physical chemistry and transition elements · 5.3 Transition elements · 2.1 Atoms and reactions · 2.2 Electrons, bonding and structure · 5.1 Rates, equilibrium and pH