H3 Chemistry 9813
Extend a complete H2 foundation through all 60 additional H3 Chemistry outcomes in three focused subject areas.
Learning goals
- Distinguish atomic and molecular orbitals
- Classify bonding, antibonding and nonbonding orbitals
- Distinguish molecular orbitals with sigma and pi symmetry
- Explain discrete molecular-orbital energy levels
- Apply LCAO to homonuclear diatomic molecules
- Apply LCAO to benzene and linear polyenes
- Construct and interpret diatomic MO diagrams, including HOMO and LUMO
- Construct and interpret pi-MO diagrams for benzene and polyenes
- Relate electromagnetic radiation, photons and E = hf
- Compare electronic, vibrational, rotational and nuclear energy quantisation
- Explain photon absorption and emission as energy-level transitions
- Relate electronic transitions and chromophores to UV/visible absorption
- Predict UV/visible absorption from a chromophore
- Explain conjugation, energy gaps and longer-wavelength absorption
- Use the Beer–Lambert law in concentration calculations
- Plan quantitative analysis using UV/visible spectroscopy
- Describe stretching vibrations
- Describe bending vibrations
- Predict IR absorption count and vibrations for simple molecules
- Identify characteristic functional-group IR absorptions
- Suggest structures from IR spectra
- Predict characteristic IR absorptions from structure
- Relate polyatomic-gas IR absorption to the greenhouse effect
- Explain nuclear spin
- Explain energy absorption in NMR
- Interpret chemical shift
- Account for deuterated solvents and labile protons
- Determine proton equivalence and signal count
- Use peak integration to count protons
- Interpret first-order spin–spin splitting and multiplicity
- Use the delta scale and TMS reference
- Explain electronegativity and inductive effects on shielding
- Explain anisotropic effects on chemical shift
- Explain hydrogen-bonding effects on chemical shift
- Explain mass-spectrometric ionisation and fragmentation
- Interpret mass-to-charge ratio
- Identify a molecular-ion peak
- Interpret M+1, M+2 and M+4 isotope patterns
- Suggest major fragment ions without rearrangement
- Use Newman and other stereochemical projections
- Interpret stereochemical projections
- Explain conformational isomerism and rotational barriers
- Assign cis/trans and E/Z configurations
- Apply R/S, optical activity and optical-purity reasoning
- Identify cis/trans isomerism in square-planar and octahedral complexes
- Identify enantiomerism in octahedral complexes
- Apply the Hammond postulate to reaction mechanisms
- Explain nucleophile effects on substitution rate
- Explain leaving-group effects on substitution rate
- Explain substituent effects on substitution rate
- Compare SN1 and SN2 profiles, rate laws and steady-state reasoning
- Compare SN1 and SN2 stereochemistry and ion-pair effects
- Apply substituent effects to SN1 and SN2
- Evaluate competition between SN1 and SN2
- Apply syn/anti elimination and stereoselectivity
- Apply Zaitsev/Hofmann regioselectivity
- Compare E1 and E2 profiles and rate laws
- Compare E1 and E2 regioselectivity
- Apply substrate effects in E2/SN2 competition
- Apply base effects in E2/SN2 competition
H3 Chemistry builds on the complete H2 course and asks you to use familiar ideas with greater depth and precision. Work through the three additional areas in order.
H2 Chemistry is a concurrent requirement
The official 9813 syllabus includes the whole H2 Chemistry syllabus. Candidates must offer H2 Chemistry in the same examination year. Use the H2 Chemistry 9476 course for that foundation and return to its lessons whenever an assumed idea needs refreshing.
Additional H3 content
The written paper lasts 2 hours 30 minutes and carries 100 marks. Section A is compulsory; in Section B, answer two of three questions. The additional content expects you to connect experimental evidence, molecular representations, kinetics, energetics and organic mechanisms rather than recall isolated facts.
Start with the Spectroscopic Techniques skill check to build a focused repair and practice plan, or continue a saved plan.
Use H1 Chemistry if you take 8873. The A-Level Chemistry chooser compares H1, H2 and H3.
Official boundary
The additional content follows H3 Chemistry 9813 (2027), Subject Content, pages 8–13. Important limits include Newman but not Fischer projections; no fac/mer requirement; no solvent effects in the SN1/SN2 comparison; and no rearrangement-derived mass-spectral fragments.
Review
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