OCR A-Level Chemistry AS Breadth in chemistry (01), November 2020
Every question from OCR A-Level Chemistry AS Breadth in chemistry (01), November 2020 (H032): 25 questions, 70 marks, each with its mark scheme and topic.
- Question 1 1 mark
Identify which of the given substances contains polar molecules from a multiple-choice list.
Module 2: Foundations in chemistry · 2.2 Electrons, bonding and structure
- Question 2 1 mark
Identify the correct chemical formula for silver carbonate from the given multiple-choice options.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 3 1 mark
Identify the correct statement explaining why ice is less dense than water based on hydrogen bonding.
Module 2: Foundations in chemistry · 2.2 Electrons, bonding and structure
- Question 4 1 mark
Identify which Group 2 compound would not be suitable to neutralise acid soils or treat acid indigestion from a given multiple-choice list.
Module 3: Periodic table and energy · 3.1 The periodic table
- Question 5 1 mark
Identify which p-block element contains atoms with one unpaired electron from a given multiple-choice list.
Module 2: Foundations in chemistry · 2.2 Electrons, bonding and structure
- Question 6 1 mark
Identify which species is oxidised and reduced in the given redox equation involving chlorine-containing compounds.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 7 1 mark
Identify the correct formula of the ferrate(VI) ion given that potassium ferrate(VI) contains two potassium ions for every ferrate(VI) ion.
Module 2: Foundations in chemistry · Module 5: Physical chemistry and transition elements · 5.3 Transition elements · 2.1 Atoms and reactions
- Question 8 1 mark
Determine the number of moles of HNO3 that react with 1 mole of Cu in the unbalanced equation for the reaction of copper with concentrated nitric acid.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 9 1 mark
Determine the molecular formula of a gaseous compound formed from the reaction of Cl2 and ClF3 based on their reacting volumes.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 10 1 mark
Identify which chemical sample contains the greatest number of molecules by calculating moles for each given mass and formula.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 11 1 mark
Calculate the bond enthalpy for the O-H bond given the reaction enthalpy and other bond enthalpies.
Module 3: Periodic table and energy · 3.2 Physical chemistry
- Question 12 1 mark
Determine the conditions of temperature and pressure that produce the greatest equilibrium yield of hydrogen for the given reversible reaction.
Module 3: Periodic table and energy · 3.2 Physical chemistry
- Question 13 1 mark
Calculate the numerical value of the equilibrium constant Kc for the reversible reaction between sulfur dioxide and oxygen given their equilibrium concentrations.
Module 5: Physical chemistry and transition elements · 5.1 Rates, equilibrium and pH
- Question 14 1 mark
Identify the correct statement regarding the relationship between the two given organic structures, involving empirical formula, relative molecular mass, structural isomers, and functional groups.
Module 4: Core organic chemistry · 4.1 Basic concepts and hydrocarbons
- Question 15 1 mark
Identify the property that explains the low reactivity of alkanes from a multiple-choice list.
Module 4: Core organic chemistry · 4.1 Basic concepts and hydrocarbons
- Question 16 1 mark
Identify the correct reagents needed to convert butan-2-ol into 2-bromobutane.
Module 4: Core organic chemistry · 4.2 Alcohols, haloalkanes and analysis
- Question 17 1 mark
Identify which organic compound can undergo both oxidation with acidified potassium dichromate and an acid-catalyzed elimination reaction.
Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · 4.2 Alcohols, haloalkanes and analysis
- Question 18 1 mark
Calculate the percentage yield of CH3CH2CHOHCH3 given the mass of 2-bromobutane reacted and the mass of product formed.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 19 1 mark
Identify the correct description of a nucleophile in terms of electron pairing and attraction.
Module 4: Core organic chemistry · 4.1 Basic concepts and hydrocarbons
- Question 20 1 mark
Identify the carboxylic acid that produces a mass spectrum with peaks at m/z = 29 and m/z = 102 from four given structural isomers.
Module 6: Organic chemistry and analysis · 6.3 Analysis
- Question 21 7 marks
Complete electron shell capacity, state isotope similarities and differences, calculate relative atomic mass from mass spectra, and explain molecular ion peak m/z values for chlorine.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions · 2.2 Electrons, bonding and structure
- Question 22 9 marks
Determine the electron configuration, equation, lattice type and molar mass/molecular formula for compounds of bromine.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions · 2.2 Electrons, bonding and structure
- Question 23 11 marks
Calculate concentrations of barium hydroxide and hydroxide ions from mass and titration data, and outline preparation routes for barium hydroxide from barium metal.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Practical Activity Groups · PAG 2: Acid-base titration · 2.1 Atoms and reactions · 3.1 The periodic table
- Question 24 8 marks
Calculate the standard enthalpy change of formation of ammonia and explain using Boltzmann distributions why temperature and catalysts increase reaction rate.
Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · 3.2 Physical chemistry · 5.1 Rates, equilibrium and pH
- Question 25 15 marks
Outline the reactions of propene including polymerisation, addition with HBr, and electrophilic addition of bromine, along with questions on alkynes including homologue series, equations, isomers, and IUPAC structures.
Module 4: Core organic chemistry · Module 2: Foundations in chemistry · 4.1 Basic concepts and hydrocarbons · 2.1 Atoms and reactions