OCR A-Level Chemistry Periodic table, elements and physical chemistry (01), November 2020
Every question from OCR A-Level Chemistry Periodic table, elements and physical chemistry (01), November 2020 (H432): 22 questions, 100 marks, each with its mark scheme and topic.
- Question 1 1 mark
Identify which experimental procedure explains why a student obtains a smaller titre during an acid-base titration of sodium hydroxide with hydrochloric acid.
Module 2: Foundations in chemistry · Practical Activity Groups · PAG 2: Acid-base titration · 2.1 Atoms and reactions
- Question 2 1 mark
Identify which statement gives the numerical value of the Avogadro constant involving moles, mass, and electrons.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 3 1 mark
Identify element X given the mass reacted with oxygen to form an oxide of formula X2O3.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 4 1 mark
Calculate the mass of calcium hydroxide that completely neutralises a given volume and concentration of phosphoric acid.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 5 1 mark
Identify the correct statement about elements in the d block of Period 4 regarding electron configurations and ion properties.
Module 2: Foundations in chemistry · Module 5: Physical chemistry and transition elements · 5.3 Transition elements · 2.2 Electrons, bonding and structure
- Question 6 1 mark
Calculate the standard enthalpy of combustion of C7H8 using given enthalpies of formation values.
Module 3: Periodic table and energy · 3.2 Physical chemistry
- Question 7 1 mark
Identify the correct statement regarding a Boltzmann distribution curve at a higher temperature.
Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · 3.2 Physical chemistry · 5.1 Rates, equilibrium and pH
- Question 8 1 mark
Calculate the activation energy in kJ mol⁻¹ given the gradient of a ln(k) against 1/T graph.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH
- Question 9 1 mark
Calculate the value of the equilibrium constant Kp for the synthesis of ammonia given the equilibrium partial pressures and total pressure.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH
- Question 10 1 mark
Deduce the overall order of the reaction between ICl and H2 given the units of the rate constant.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH
- Question 11 1 mark
Calculate the pH of the resulting mixture when hydrochloric acid is added to sodium hydroxide solution
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH
- Question 12 1 mark
Determine the ratio of MnO2(s) to OH-(aq) in the balanced redox equation for the reaction between I-(aq) and MnO4-(aq).
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 13 1 mark
Identify the correct statements about the effect of adding a catalyst to a system in dynamic equilibrium.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH
- Question 14 1 mark
Identify the correct statements concerning Group 2 elements regarding ionisation energy, electron configuration of ions, and reactions with water.
Module 3: Periodic table and energy · Module 2: Foundations in chemistry · 3.1 The periodic table · 2.2 Electrons, bonding and structure
- Question 15 1 mark
Identify the correct statements regarding the isomerism and coordination number of the complex ion [Co(NH2CH2CH2NH2)3]2+.
Module 5: Physical chemistry and transition elements · 5.3 Transition elements
- Question 16 18 marks
Calculate the enthalpy change of hydration of bromide ions, total ions in magnesium bromide, and explain physical properties and lattice enthalpy.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · 2.1 Atoms and reactions · 2.2 Electrons, bonding and structure · 3.2 Physical chemistry · 5.2 Energy
- Question 17 13 marks
Predict equilibrium conditions for methanol production, state green chemistry benefits of catalysts, calculate Gibbs free energy change and feasibility at a given temperature, and determine Kp and its units.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH · 5.2 Energy
- Question 18 12 marks
Calculate buffer concentrations, explain redox changes in magnesium with ethanoic acid, and determine conjugate acid-base pairs and weak acid concentration from pH.
Module 2: Foundations in chemistry · Module 5: Physical chemistry and transition elements · Module 6: Organic chemistry and analysis · 6.1 Aromatic compounds, carbonyls and acids · 5.1 Rates, equilibrium and pH · 2.1 Atoms and reactions
- Question 19 9 marks
Use standard electrode potentials to draw an electrochemical cell, explain redox observations involving methanal and manganate(VII), and calculate the standard electrode potential for an oxygen fuel cell half-equation.
Module 5: Physical chemistry and transition elements · Module 6: Organic chemistry and analysis · Practical Activity Groups · 5.2 Energy · 6.1 Aromatic compounds, carbonyls and acids · PAG 8: Electrochemical cells
- Question 20 9 marks
Investigate the reaction kinetics and equilibrium constant for the esterification of ethanoic acid with methanol using graphical analysis and concentration data
Module 5: Physical chemistry and transition elements · Module 6: Organic chemistry and analysis · 5.1 Rates, equilibrium and pH · 6.1 Aromatic compounds, carbonyls and acids
- Question 21 9 marks
Explain the trend in reactivity of halogens using displacement reactions, state a benefit and risk of water treatment with chlorine, and determine the molecular formula of a bromine-fluorine compound from gas volume data.
Module 3: Periodic table and energy · Module 2: Foundations in chemistry · 3.1 The periodic table · 2.1 Atoms and reactions
- Question 22 15 marks
Identify unknown transition metal compounds B to H and write ionic equations, determine the formula and oxidation number of a complex nickel compound containing SCN- and NH3 ligands, and calculate the concentration of sulfite in burger meat using a manganate(VII) titration.
Module 5: Physical chemistry and transition elements · Module 2: Foundations in chemistry · Practical Activity Groups · 5.3 Transition elements · PAG 2: Acid-base titration · PAG 4: Qualitative analysis of ions · 2.1 Atoms and reactions