Chemistry (9813)

9 sections available · 24 chapters available

Free Chemistry (9813) study notes for GCE A-Level - Higher 3 (H3) students. Each chapter below covers a key topic with worked examples and practice prompts you can take into the thinka app.

Basic Principles of Spectroscopy

Molecular orbital theory
Electromagnetic spectrum
Quantisation of energy
Energy level transitions

Ultraviolet/visible Spectroscopy

Electronic transitions
Chromophores
Molar absorptivity and the Beer–Lambert law

Infrared (IR) Spectroscopy

Molecular vibrations: stretching and bending
Characteristic IR absorptions

Nuclear Magnetic Resonance (NMR) Spectroscopy

Nuclear spin and energy absorption
Chemical shift: δ scale, internal reference, electronegativity effects, anisotropic effects, hydrogen bonding
Calculation of peak area and proton counting
Spin-spin splitting

Mass Spectrometry

Ionisation, fragmentation and mass/charge ratio
Interpretation of spectra: molecular ion peak, isotopic abundance, fragment ions

Molecular Stereochemistry

Stereochemical projection
Isomerism: conformational, cis-trans, enantiomerism, diastereomerism

Basic Physical Organic Chemistry

The Hammond postulate: relationship between the transition state and the nearest stable species

Nucleophilic Substitution

Mechanism: nature of nucleophiles and leaving group, SN1, SN2
Kinetics of mechanisms: energy profile, rate law, simple rate equations, orders of reaction, rate constants, stereochemistry, substituent effects
Competition between SN1 and SN2

Elimination

Mechanism: syn- and anti-elimination, stereoselectivity, regioselectivity, E1, E2
Kinetics of mechanisms: energy profile, rate law, regioselectivity
E2/SN2 competition: substrate effects, base effects

Put These Notes into Practice

Don't just read — practise with unlimited AI-generated questions and get instant feedback. Join 100,000+ students improving their grades.

Start Practising NowView Pricing

Done reading? Test yourself with AI practice questions 🚀

Practice This Topic Now