OCR A-Level Chemistry AS Depth in chemistry (02), November 2021
Every question from OCR A-Level Chemistry AS Depth in chemistry (02), November 2021 (H032): 7 questions, 70 marks, each with its mark scheme and topic.
- Question 1 11 marks
Explain ionic bonding, draw dot-and-cross diagrams for K2S and SF2, explain the different melting/boiling points of K2S and SF2 based on structure and bonding, and predict the shape, bond angle, and unreactivity of SF6.
Module 2: Foundations in chemistry · 2.2 Electrons, bonding and structure
- Question 2 6 marks
Define a radical, identify the type of bond breaking in radical substitution, draw two monohalogenated products of alkane A, and write an equation for its further substitution with bromine.
Module 4: Core organic chemistry · 4.1 Basic concepts and hydrocarbons
- Question 3 12 marks
Perform calculations and analysis based on an acid-base titration of glutaric acid with sodium hydroxide.
Module 1: Development of practical skills in chemistry · Module 2: Foundations in chemistry · Practical Activity Groups · 1.1 Practical skills assessed in a written examination · PAG 2: Acid-base titration · 2.1 Atoms and reactions
- Question 4 6 marks
Calculate the enthalpy change for the decomposition of magnesium carbonate using experimental data from calorimetry and an enthalpy cycle.
Module 3: Periodic table and energy · Module 1: Development of practical skills in chemistry · Practical Activity Groups · 3.2 Physical chemistry · 1.1 Practical skills assessed in a written examination · PAG 3: Enthalpy determination
- Question 5 10 marks
Calculate the equilibrium concentration of methanol, determine the position of equilibrium, write electron configurations, and identify a Period 3 element using successive ionisation energies.
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 · 3.1 The periodic table · 3.2 Physical chemistry
- Question 6 13 marks
Analyze the rate of reaction between strontium and water using a gas syringe method, evaluate an alternative mass-loss method, calculate the mass of barium needed to react with the same amount of moles, sketch a rate graph for barium, and explain the trend in reactivity of Group 2 elements with water.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Practical Activity Groups · PAG 9: Rates of reaction – continuous monitoring method · 2.1 Atoms and reactions · 3.1 The periodic table · 3.2 Physical chemistry
- Question 7 12 marks
Write a balanced equation for the preparation of 2-chloro-2-methylpropane from 2-methylpropan-2-ol, explain the purification of the organic liquid, calculate the expected mass from percentage yield, name structural isomer A, and write the oxidation equation for structural isomer B.
Module 1: Development of practical skills in chemistry · Module 4: Core organic chemistry · Practical Activity Groups · 1.1 Practical skills assessed in a written examination · 4.2 Alcohols, haloalkanes and analysis · PAG 5: Synthesis of an organic liquid