OCR A-Level Chemistry AS Depth in chemistry (02), June 2024
Every question from OCR A-Level Chemistry AS Depth in chemistry (02), June 2024 (H032): 6 questions, 70 marks, each with its mark scheme and topic.
- Question 1 15 marks
Define electronegativity, illustrate and explain hydrogen bonding and polarity in water and ammonia, draw a dot-and-cross diagram for the ammonium ion, describe the test for ammonium ions, and calculate the mass of anhydrous zinc sulfate produced by heating hydrated zinc sulfate.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Practical Activity Groups · 2.1 Atoms and reactions · 2.2 Electrons, bonding and structure · 3.1 The periodic table · PAG 4: Qualitative analysis of ions
- Question 2 17 marks
Analyze periodicity, electron configurations, redox reactions of calcium with hydrochloric acid, and first ionisation energy trends for Group 2 and related elements.
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 3 9 marks
Define enthalpy change of reaction, calculate the enthalpy change for the displacement reaction between zinc and copper(II) nitrate from experimental data including assumptions and improvements, and explain why halving the volumes keeps the enthalpy change constant.
Module 3: Periodic table and energy · Practical Activity Groups · 3.2 Physical chemistry · PAG 3: Enthalpy determination
- Question 4 13 marks
Explain the effect of a catalyst using a Boltzmann distribution, analyze gas volume data to determine reaction rate via a tangent, calculate reactant concentration from gas volume, and suggest control variables.
Module 1: Development of practical skills in chemistry · Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Practical Activity Groups · 1.1 Practical skills assessed in a written examination · 2.1 Atoms and reactions · 3.2 Physical chemistry · PAG 9: Rates of reaction – continuous monitoring method
- Question 5 10 marks
Complete reaction pathways for the reactions of but-1-ene with bromine, hydrogen/nickel, and steam/acid, outline the electrophilic addition mechanism for the reaction with HBr, and explain why 2-bromobutane is formed as the major product.
Module 4: Core organic chemistry · 4.1 Basic concepts and hydrocarbons
- Question 6 6 marks
Determine the structure of an organic compound X containing two functional groups using percentage composition, mass spectrometry, and infrared spectroscopy 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 · 6.1 Aromatic compounds, carbonyls and acids · 6.3 Analysis