OCR A-Level Chemistry AS Depth in chemistry (02), November 2020
Every question from OCR A-Level Chemistry AS Depth in chemistry (02), November 2020 (H032): 5 questions, 70 marks, each with its mark scheme and topic.
- Question 1 13 marks
Calculate the volume of hydrochloric acid needed to react with nickel, determine the volume of hydrogen produced, explain the reaction of magnesium, and describe analytical tests to identify nickel(II) bromide, sulfate, and carbonate.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Module 1: Development of practical skills in chemistry · Practical Activity Groups · PAG 4: Qualitative analysis of ions · 2.1 Atoms and reactions · 3.1 The periodic table
- Question 2 12 marks
Define enthalpy change of combustion, calculate $\Delta_c H$ for cyclohexane from experimental calorimetry data, and evaluate the procedure including percentage uncertainties and sources of error.
Module 1: Development of practical skills in chemistry · Module 3: Periodic table and energy · Practical Activity Groups · 1.1 Practical skills assessed in a written examination · 3.2 Physical chemistry · PAG 3: Enthalpy determination
- Question 3 18 marks
Explain the bonding, structure, properties, and reactions of Period 4 elements and their compounds including calcium, bromine, barium, selenium, and sodium bromate.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · 2.1 Atoms and reactions · 2.2 Electrons, bonding and structure · 3.1 The periodic table
- Question 4 9 marks
Predict the bond angle and explain shapes of molecules using VSEPR, write a Kc expression, calculate equilibrium concentrations from stoichiometry and Kc values, and predict the effect of temperature on chemical equilibrium for nitrosyl chloride dissociation.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · 2.2 Electrons, bonding and structure · 3.2 Physical chemistry
- Question 5 18 marks
Identify secondary alcohols among structures A-F, write combustion equations, calculate atom economy, outline nucleophilic substitution mechanisms, explain hydrolysis rate differences between haloalkanes, and deduce unknown alcohol and oxidation product structures using mass spectrum and IR data.
Module 2: Foundations in chemistry · Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · 2.1 Atoms and reactions · 4.2 Alcohols, haloalkanes and analysis