Student Life

Count regions of electron density around a central atom from its Lewis structure.

Predict linear, trigonal planar, tetrahedral, trigonal pyramidal, and bent molecular shapes.

State the approximate bond angles associated with common molecular shapes.

Explain a molecular shape using repulsion between regions of electron density.

Determine whether a covalent bond is polar using electronegativity differences.

Determine whether a molecule is polar by combining bond polarity with molecular symmetry.

Compare the overall strength of intermolecular attractions in simple molecular substances using molecular size and polarity.

Classify a substance as molecular, ionic, metallic, or covalent network from a particle-level description.

Represent the particles and attractions in a molecular solid.

Represent the ions and electrostatic attractions in an ionic lattice.

Represent positive metal ions and delocalised electrons in a metallic lattice.

Represent the continuous bonding in a covalent network solid.

Explain electrical conductivity in solid, molten, and aqueous substances using mobile charged particles.

Explain hardness, malleability, or ductility from a substance’s structure and bonding.

Compare melting point, boiling point, and solubility in polar or non-polar solvents by linking structure, particles, and attractions.

Classify a process as exothermic or endothermic from temperature data, an enthalpy value, or an energy profile.

Relate the sign of an enthalpy change to energy transfer between the reacting system and surroundings.

Draw and label an enthalpy profile for an exothermic reaction.

Draw and label an enthalpy profile for an endothermic reaction.

Explain why bond breaking absorbs energy and bond formation releases energy.

Calculate an energy change for a specified amount of substance using ΔrH and reaction stoichiometry.

Calculate energy involved in a change of state using the amount of substance and molar enthalpy.

Calculate a reaction enthalpy from average bond enthalpies, showing signs, units, and three significant figures.

Construct a structure–bonding–property explanation using an explicit chain of chemical reasoning.

Compare two substances by relating differences in their particles and attractions to a specified property.

Analyse an unfamiliar substance by combining its Lewis structure, shape, bond polarity, and molecular polarity.

Justify a predicted solubility result by considering both the solute and the polar or non-polar solvent.

Complete one AS91164-style extended-response question under timed conditions.

Evaluate an AS91164 response against an assessment schedule and rewrite it at Excellence level.

Interpret molecular, displayed structural, and condensed structural representations of an organic compound.

Choose and number the correct longest carbon chain for an organic name.

Name and draw straight-chain and branched alkanes containing no more than eight carbons in the longest chain.

Name and draw alkenes and alkynes with correctly numbered multiple bonds.

Name and draw haloalkanes with correctly numbered halogen substituents.

Name and draw primary amines and alcohols with correctly numbered functional groups.

Name and draw carboxylic acids using IUPAC conventions.

Check an organic structure for valid carbon valency, hydrogen count, and functional-group placement.

Determine whether two structural formulae represent the same compound or constitutional isomers.

Generate the constitutional isomers that satisfy a specified molecular formula and compound family.

Determine whether an alkene can exhibit cis–trans isomerism.

Draw and name the cis and trans forms of a qualifying alkene.

Classify an alcohol as primary, secondary, or tertiary from its structure.

Classify a haloalkane as primary, secondary, or tertiary from its structure.

Predict how carbon-chain length affects the melting point, boiling point, and water solubility of an organic compound.

Compare physical properties of organic compounds using their chain lengths and functional groups.

Recognise an alkene addition reaction from the reactant and product structures.

Draw the product of alkene hydrogenation using H₂ with a platinum catalyst.

Draw the product of adding Cl₂ or Br₂ to an alkene and state the expected bromine observation.

Draw the alcohol formed by acid-catalysed hydration of a symmetrical alkene.

Draw products formed by adding a hydrogen halide to a symmetrical alkene.

Identify major and minor products when water or a hydrogen halide is added to an asymmetric alkene.

Draw a polymer repeating unit from an alkene monomer.

Recover the alkene monomer from a given addition-polymer repeating unit.

Draw the monosubstitution product formed when an alkane reacts with a halogen.

State the reaction conditions needed for halogen substitution of an alkane.

Draw the haloalkane formed when an alcohol reacts with a hydrogen halide.

Draw the haloalkane formed when an alcohol reacts with PCl₃, PCl₅, or SOCl₂.

Draw the alcohol formed when a haloalkane reacts with aqueous potassium hydroxide.

Draw the primary amine formed when a haloalkane reacts with ammonia.

Recognise substitution reactions by tracking the functional-group change.

Select a suitable substitution reagent and condition for a specified one-step conversion.

Draw the carboxylic acid formed by oxidising a primary alcohol with acidified permanganate or dichromate.

State the relevant colour observation when acidified permanganate or dichromate oxidises a primary alcohol.

Draw the oxidation product formed when an alkene reacts with permanganate and state the relevant observation.

Draw the alkene formed by eliminating water from an alcohol.

Draw the alkene formed by eliminating a hydrogen halide from a haloalkane.

Identify major and minor alkene products from elimination involving an asymmetric reactant.

Write products for an acid–base reaction involving a carboxylic acid.

Write products for an acid–base reaction involving a primary amine.

Organise the required Level 2 organic reactions into a functional-group conversion map.

Select reagents and conditions for a specified one-step organic conversion.

Infer an organic functional group from a reaction result or colour observation.

Design a two-step reaction sequence between specified organic compounds.

Predict all valid products of an addition or elimination reaction and identify the major product where required.

Explain an organic reaction by linking the reactant’s functional group, reagent, reaction type, and product structure.

Complete one AS91165-style extended-response question under timed conditions.

Evaluate an AS91165 response against an assessment schedule and rewrite it at Excellence level.

Distinguish the demands of describe, explain, justify, compare, and analyse in NCEA Chemistry questions.

Apply IUPAC symbols, naming conventions, units, and three-significant-figure rounding consistently.

Plan time allocation for the AS91164 and AS91165 sections of a mock examination.

Complete a full AS91164 practice paper within a 60-minute limit.

Complete a full AS91165 practice paper within a 60-minute limit.

Classify errors from a marked practice paper as knowledge, reasoning, convention, calculation, or time-management errors.

Create and complete a targeted practice set addressing the three highest-impact errors before the mock.

Produce an Excellence-level response to a mixed unfamiliar-context question by selecting and linking the relevant chemistry.