Singapore · SEABSyllabus
Chemistry syllabus, dot point by dot point
Every dot point in the Singapore Chemistrysyllabus, with a focused answer for each one. Click any dot point for a worked explainer, past exam questions, and links to related dot points. Written by Claude Opus 4.8, Anthropic's latest AI.
Analytical Techniques
Module overview →- How does carbon-13 NMR reveal the number and types of carbon environments in a molecule?Interpret a carbon-13 NMR spectrum by relating the number of peaks to the number of carbon environments and the chemical shift of each peak to the type of carbon environment using the data booklet7 min answer →
- How are common cations, anions and gases identified by simple chemical tests in qualitative analysis?Describe the chemical tests used in qualitative analysis to identify common cations (including with NaOH and aqueous ammonia), anions (carbonate, sulfate, halides, nitrate) and gases, and interpret the observations9 min answer →
- How does infrared spectroscopy identify the functional groups present in an organic molecule?Explain the origin of infrared absorption from bond vibrations, use characteristic absorption ranges from the data booklet to identify functional groups, and distinguish compounds such as alcohols, carbonyls and carboxylic acids from their spectra8 min answer →
- How does mass spectrometry reveal relative molecular mass and structural fragments of an organic compound?Interpret a mass spectrum to identify the molecular ion and relative molecular mass, deduce fragments from peaks, and explain isotope patterns including the M+2 peak of chlorine and bromine compounds8 min answer →
- How does proton NMR spectroscopy reveal the number, environment and neighbours of hydrogen atoms in a molecule?Interpret a proton (1H) NMR spectrum using chemical shift, peak area (integration), and spin-spin splitting (the n+1 rule), and use D2O exchange to identify OH and NH protons10 min answer →
- How are mass spectrometry, infrared and NMR data combined with chemical tests to deduce the full structure of an unknown organic compound?Combine evidence from mass spectrometry, infrared spectroscopy, proton and carbon-13 NMR and chemical tests to deduce the structure of an organic compound, working systematically from molecular mass to functional groups to the carbon skeleton10 min answer →
Inorganic Chemistry
Module overview →- How do the trends in Group 17 explain the relative oxidising power of the halogens and the behaviour of their compounds?Describe the trends down Group 17 in volatility, colour and oxidising power, explain displacement reactions of halogens and halides, describe the reactions of halide ions with silver nitrate and with concentrated sulfuric acid, and the disproportionation of chlorine10 min answer →
- How and why do the properties of the Group 2 elements and their compounds change down the group?Describe the trends down Group 2 in reactivity with water and oxygen, the thermal stability and solubility of the carbonates, nitrates, hydroxides and sulfates, and explain these trends in terms of ionic radius and charge density9 min answer →
- Why is nitrogen so unreactive, and how do its key compounds behave and affect the environment?Explain the unreactivity of nitrogen, describe the formation and basicity of ammonia, the industrial Haber process and the formation of nitrogen oxides, and discuss the environmental impact of nitrogen oxides and ammonium fertilisers9 min answer →
- How do the properties of the Period 3 elements and their oxides and chlorides vary across the period, and why?Describe and explain the periodic variation across Period 3 in atomic radius, ionic radius, melting point and electrical conductivity, and the trends in the bonding, structure and acid-base behaviour of the oxides and chlorides10 min answer →
- How is sulfuric acid manufactured, and how do sulfur oxides affect the environment?Describe the formation of sulfur dioxide and its role in acid rain, outline the Contact process for manufacturing sulfuric acid, and explain the use of sulfur dioxide as a preservative and the methods used to control sulfur emissions9 min answer →
- What gives the transition elements their characteristic variable oxidation states and catalytic behaviour?Define a transition element, explain the existence of variable oxidation states from the close energies of the 3d and 4s subshells, and describe their use as catalysts and the role of variable oxidation states in catalysis9 min answer →
- How do transition metals form coloured complex ions, and what controls the colour observed?Describe the formation of complex ions with ligands, explain coordination number and shape, account for the origin of colour in terms of d orbital splitting and d-d transitions, and describe ligand exchange reactions10 min answer →
Organic Chemistry
Module overview →- Why are alkanes relatively unreactive, and how does free-radical substitution proceed?Describe the bonding and relative inertness of alkanes, their combustion, and the free-radical substitution of alkanes by halogens, including the initiation, propagation and termination steps of the mechanism9 min answer →
- Why are alkenes reactive, and how does electrophilic addition explain their reactions and product distribution?Describe the reactions of alkenes including electrophilic addition of hydrogen halides, halogens and water, oxidation, and the mechanism of electrophilic addition including Markovnikov's rule and carbocation stability11 min answer →
- How does the delocalised structure of benzene explain its stability and its characteristic reactions?Describe the delocalised structure of benzene and the evidence for it, explain why benzene undergoes electrophilic substitution rather than addition, and describe the mechanisms of nitration and halogenation10 min answer →
- How do aldehydes and ketones react, and how can they be distinguished from each other?Describe the reactions of aldehydes and ketones including nucleophilic addition of HCN, reduction, and the use of 2,4-DNPH, Tollens, Fehling and the tri-iodomethane test to identify and distinguish carbonyl compounds10 min answer →
- How do carboxylic acids and their derivatives react, and how does structure control their acidity and hydrolysis?Describe the acidity and reactions of carboxylic acids, the formation and hydrolysis of esters, acyl chlorides and amides, and explain the relative acid strengths of carboxylic acids in terms of inductive effects10 min answer →
- How do halogenoalkanes react with nucleophiles, and what controls whether the mechanism is SN1 or SN2?Describe the nucleophilic substitution and elimination reactions of halogenoalkanes, distinguish the SN1 and SN2 mechanisms, relate the mechanism to the class of halogenoalkane, and explain the relative rates of hydrolysis of the halogenoalkanes11 min answer →
- How do alcohols and phenols react, and why is phenol more acidic and more reactive toward the ring than benzene?Describe the reactions of alcohols including oxidation, esterification, dehydration and the tri-iodomethane test, classify primary, secondary and tertiary alcohols, and explain the greater acidity of phenol and its ease of ring substitution11 min answer →
- How are organic molecules named and represented, and what types of isomerism arise from their structure?Apply IUPAC nomenclature, interpret structural, displayed and skeletal formulae, and describe and identify constitutional (structural) isomerism and stereoisomerism (cis-trans and optical isomerism)10 min answer →
- How do amines, amides and amino acids behave, and what controls the basicity of an amine?Describe the preparation and basicity of amines and explain the relative basicity of aliphatic and aromatic amines, describe the hydrolysis of amides, and describe the zwitterion behaviour and isoelectric point of amino acids10 min answer →
- How do addition and condensation polymers form, and how do their structures relate to their properties and disposal?Distinguish addition and condensation polymerisation, identify the repeat unit and monomers of a given polymer, describe polyesters and polyamides, and discuss the disposal and environmental impact of plastics9 min answer →
Physical Chemistry
Module overview →- How is the electronic structure of an atom deduced, and how does it explain ionisation energy patterns?Describe the structure of the atom in terms of protons, neutrons and electrons, deduce electronic configurations using s, p and d subshells, and explain successive and periodic ionisation energy trends in terms of nuclear charge, shielding and subshell energies9 min answer →
- How do the type of bonding and the shape of a molecule arise from electron arrangement, and how do they control physical properties?Describe ionic, covalent (including dative) and metallic bonding, predict molecular shapes and bond angles using VSEPR, account for bond polarity and overall polarity, and relate intermolecular forces (van der Waals, hydrogen bonding) to physical properties10 min answer →
- How are enthalpy changes defined, measured and calculated, and what controls whether a reaction is energetically favourable?Define standard enthalpy changes (formation, combustion, neutralisation, atomisation, lattice energy, hydration, solution), apply Hess's law and Born-Haber cycles, and use the relationship between enthalpy, entropy and Gibbs free energy to judge feasibility11 min answer →
- How is the position of a dynamic equilibrium described quantitatively, and how does it respond to changing conditions?Explain dynamic equilibrium and write expressions for Kc and Kp, calculate equilibrium constants and equilibrium amounts, and apply Le Chatelier's principle to predict the effect of concentration, pressure, temperature and catalysts on the position of equilibrium11 min answer →
- How do standard electrode potentials predict the direction and feasibility of redox reactions, and how is electrolysis quantified?Define standard electrode potential, calculate standard cell potential and use it to predict the feasibility of redox reactions, describe the effect of concentration qualitatively, and apply Faraday's laws to electrolysis calculations11 min answer →
- How are acid and base strength, pH and buffering described quantitatively?Apply the Bronsted-Lowry theory, distinguish strong and weak acids and bases using Ka, Kb and pKa, calculate pH of strong and weak acids and of buffers, explain buffer action, and interpret titration curves and indicator choice12 min answer →
- What controls how fast a reaction goes, and how can the rate equation reveal the mechanism?Explain rate of reaction using collision theory and the Boltzmann distribution, deduce rate equations and orders from experimental data, define the rate constant and half-life, and use the rate-determining step to propose a reaction mechanism, including the action of catalysts11 min answer →
- How are oxidation and reduction tracked, balanced and recognised across inorganic and organic chemistry?Assign oxidation numbers, define oxidation and reduction in terms of electron transfer and oxidation-number change, identify oxidising and reducing agents, and construct balanced redox equations from half-equations9 min answer →
- How is the solubility of a sparingly soluble ionic compound described and predicted?Define and write expressions for the solubility product Ksp, calculate solubility from Ksp and vice versa, predict precipitation by comparing the ionic product with Ksp, and explain the common ion effect9 min answer →
- How does the ideal gas equation describe gas behaviour, and when and why do real gases deviate from it?State the ideal gas equation pV = nRT and use it in calculations including determination of molar mass, explain the assumptions of the kinetic theory, and account for the deviation of real gases from ideal behaviour at high pressure and low temperature8 min answer →
- How is the mole used to connect masses, volumes and concentrations in chemical calculations?Define the mole and the Avogadro constant, interconvert mass, amount, gas volume and solution concentration, and apply stoichiometry including limiting reagent, percentage yield and atom economy and titration calculations9 min answer →