OCR A-Level Chemistry Periodic table, elements and physical chemistry (01), November 2021
Every question from OCR A-Level Chemistry Periodic table, elements and physical chemistry (01), November 2021 (H432): 22 questions, 100 marks, each with its mark scheme and topic.
- Question 1 1 mark
Identify the correct definition of electronegativity from the given multiple-choice options.
Module 2: Foundations in chemistry · 2.2 Electrons, bonding and structure
- Question 2 1 mark
Identify the formula for sodium chlorate(VII) given that a chlorate(VII) ion has a 1- charge.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 3 1 mark
Deduce the correct stoichiometric balancing numbers for silver and water in the redox reaction between silver and concentrated nitric acid.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 4 1 mark
Determine which of the four given samples of organic compounds contains the greatest number of moles of molecules.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 5 1 mark
Calculate the minimum mass of magnesium required to reduce 11.4 g of chromium(III) oxide.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 6 1 mark
Calculate the volume of water needed to dilute a solution of magnesium iodide to a given iodide ion concentration.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 7 1 mark
Identify the row showing elements in order of increasing first ionisation energy among Ca, Si, P, and N.
Module 3: Periodic table and energy · Module 2: Foundations in chemistry · 3.1 The periodic table · 2.2 Electrons, bonding and structure
- Question 8 1 mark
Calculate the enthalpy change for the reaction of hydrogen sulfide with oxygen using given mean bond enthalpies
Module 3: Periodic table and energy · 3.2 Physical chemistry
- Question 9 1 mark
Identify which container will have the largest concentration of carbon monoxide at equilibrium given different initial amounts of reactants and products.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH
- Question 10 1 mark
Calculate the pH of a 0.50 mol dm-3 aqueous solution of ethanoic acid given its pKa value at 25 °C.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH
- Question 11 1 mark
Identify the correct signs for enthalpy change and entropy change for a reaction that is feasible at high temperatures but not feasible at low temperatures.
Module 5: Physical chemistry and transition elements · 5.2 Energy
- Question 12 1 mark
Identify the strongest oxidising agent given two redox systems with their standard electrode potentials.
Module 5: Physical chemistry and transition elements · 5.2 Energy
- Question 13 1 mark
Identify the correct statement(s) that explain the trend in boiling points down the halogens group.
Module 3: Periodic table and energy · Module 2: Foundations in chemistry · 3.1 The periodic table · 2.2 Electrons, bonding and structure
- Question 14 1 mark
Identify the correct statements about a molecule of Cl-N=O regarding polarity, lone pairs, and bond angle
Module 2: Foundations in chemistry · 2.2 Electrons, bonding and structure
- Question 15 1 mark
Identify the correct test results for the hydrated double salt ammonium iron(II) sulfate from a given table of three test reactions.
Module 5: Physical chemistry and transition elements · Practical Activity Groups · 5.3 Transition elements · PAG 4: Qualitative analysis of ions
- Question 16 14 marks
Describe metallic bonding in magnesium, analyze its successive ionisation energies, and calculate the enthalpy change of solution for magnesium fluoride using an energy cycle.
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 · 5.2 Energy
- Question 17 11 marks
Explain the definitions of d-block and transition elements using electron configurations, define a bidentate ligand, determine the formulae of a hydrated chromium(III) salt and a complex ion formed by ligand substitution, write the ionic equation, and draw 3D structures for the three stereoisomers.
Module 5: Physical chemistry and transition elements · Module 2: Foundations in chemistry · 5.3 Transition elements · 2.1 Atoms and reactions
- Question 18 12 marks
Determine the percentage by mass of copper in an ore using a titration method involving copper(II) ions, potassium iodide, and sodium thiosulphate.
Module 2: Foundations in chemistry · Module 5: Physical chemistry and transition elements · Practical Activity Groups · PAG 2: Acid-base titration · 5.3 Transition elements · 2.1 Atoms and reactions
- Question 19 11 marks
Construct electrochemical cell diagrams, overall redox equations, explain disproportionation using oxidation numbers and electrode potentials, and calculate standard cell potentials for hydrogen-oxygen fuel cells.
Module 5: Physical chemistry and transition elements · 5.2 Energy
- Question 20 11 marks
Calculate Gibbs free energy change, maximum feasibility temperature, and equilibrium constant Kp for the reaction of nitrogen monoxide and oxygen to form nitrogen dioxide, and predict the effects of changes on equilibrium and rate.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH · 5.2 Energy
- Question 21 10 marks
Analyze rate of reaction data, propose reaction mechanisms, calculate activation energy from an Arrhenius plot, and determine temperature from rate constant data.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH
- Question 22 16 marks
Calculate the pH of sodium hydroxide, enthalpy changes of neutralisation and enthalpy of reaction, and determine the pH and mass of N2O3 used to form a buffer solution with nitrous acid.
Module 5: Physical chemistry and transition elements · Module 3: Periodic table and energy · Practical Activity Groups · 5.1 Rates, equilibrium and pH · 5.2 Energy · PAG 3: Enthalpy determination · PAG 11: pH measurement