CAIE · AS & A Level
Chemistry
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Full-marks answers to real Chemistry past-paper questions, each with a mark-by-mark examiner breakdown.
- A-Level Chemistry May/June 2024 Q3(a): Write an equation to show the reaction for the standard enthalpy change of formation of… solved ✓
- A-Level Chemistry May/June 2024 Q2(c)(i): Write an expression for the equilibrium constant, Kp, for reaction 1. State the units.… solved ✓
- A-Level Chemistry May/June 2024 Q6(c): Describe the shape of delocalised benzene. Include the geometry of each carbon, the C-C… solved ✓
- A-Level Chemistry May/June 2024 Q2(d)(i): When oxides of nitrogen escape into the atmosphere they may be involved in: formation o… solved ✓
- A-Level Chemistry May/June 2024 Q2(c)(ii): Equilibrium mixture D is made when 1.0mol of N₂(g) and 3.0mol of H2(g) are added to a s… solved ✓
- A-Level Chemistry May/June 2024 Q1(a)(i): Explain the lack of reactivity of nitrogen gas, N2(g). solved ✓
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Chemistry chapters
90 topics · free- 1.1Particles in the atom and atomic radius
- 1.2Isotopes
- 1.3Electrons, energy levels and atomic orbitals
- 1.4Ionisation energy
- 2.1Relative masses of atoms and molecules
- 2.2The mole and the Avogadro constant
- 2.3Formulas
- 2.4Reacting masses and volumes (of solutions and gases)
- 3.1Electronegativity and bonding
- 3.2Ionic bonding
- 3.3Metallic bonding
- 3.4Covalent bonding and coordinate (dative covalent) bonding
- 3.5Shapes of molecules
- 3.6Intermolecular forces, electronegativity and bond properties
- 3.7Dot-and-cross diagrams
- 4.1The gaseous state: ideal and real gases and pV = nRT
- 4.2Bonding and structure
- 5.1Enthalpy change, ΔH
- 5.2Hess's law
- 6.1Redox processes: electron transfer and changes in oxidation number (oxidation state)
- 7.1Chemical equilibria: reversible reactions, dynamic equilibrium
- 7.2Brønsted-Lowry theory of acids and bases
- 8.1Rate of reaction
- 8.2Effect of temperature on reaction rates and the concept of activation energy
- 8.3Homogeneous and heterogeneous catalysts
- 9.1Periodicity of physical properties of the elements in Period 3
- 9.2Periodicity of chemical properties of the elements in Period 3
- 9.3Chemical periodicity of other elements
- 10.1Similarities and trends in the properties of the Group 2 metals, magnesium to barium, and their compounds
- 11.1Physical properties of the Group 17 elements
- 11.2The chemical properties of the halogen elements and the hydrogen halides
- 11.3Some reactions of the halide ions
- 11.4The reactions of chlorine
- 12.1Nitrogen and sulfur
- 13.1Formulas, functional groups and the naming of organic compounds
- 13.2Characteristic organic reactions
- 13.3Shapes of organic molecules; σ and π bonds
- 13.4Isomerism: structural isomerism and stereoisomerism
- 14.1Alkanes
- 14.2Alkenes
- 15.1Halogenoalkanes
- 16.1Alcohols
- 17.1Aldehydes and ketones
- 18.1Carboxylic acids
- 18.2Esters
- 19.1Primary amines
- 19.2Nitriles and hydroxynitriles
- 20.1Addition polymerisation
- 21.1Organic synthesis
- 22.1Infrared spectroscopy
- 22.2Mass spectrometry
- 23.1Lattice energy and Born-Haber cycles
- 23.2Enthalpies of solution and hydration
- 23.3Entropy change, ΔS
- 23.4Gibbs free energy change, ΔG
- 24.1Electrolysis
- 24.2Standard electrode potentials E°, standard cell potentials Ecell and the Nernst equation
- 25.1Acids and bases
- 25.2Partition coefficients
- 26.1Simple rate equations, orders of reaction and rate constants
- 26.2Homogeneous and heterogeneous catalysts
- 27.1Similarities and trends in the properties of the Group 2 metals, magnesium to barium, and their compounds
- 28.1General physical and chemical properties of the first row of transition elements, titanium to copper
- 28.2General characteristic chemical properties of the first set of transition elements, titanium to copper
- 28.3Colour of complexes
- 28.4Stereoisomerism in transition element complexes
- 28.5Stability constants, Kstab
- 29.1Formulas, functional groups and the naming of organic compounds
- 29.2Characteristic organic reactions
- 29.3Shapes of aromatic organic molecules; σ and π bonds
- 29.4Isomerism: optical
- 30.1Arenes
- 31.1Halogen compounds
- 32.1Alcohols
- 32.2Phenol
- 33.1Carboxylic acids
- 33.2Esters
- 33.3Acyl chlorides
- 34.1Primary and secondary amines
- 34.2Phenylamine and azo compounds
- 34.3Amides
- 34.4Amino acids
- 35.1Condensation polymerisation
- 35.2Predicting the type of polymerisation
- 35.3Degradable polymers
- 36.1Organic synthesis
- 37.1Thin-layer chromatography
- 37.2Gas/liquid chromatography
- 37.3Carbon-13 NMR spectroscopy
- 37.4Proton (¹H) NMR spectroscopy
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