What does the CCEA AS 2 module cover?

AS 2 extends the physical and inorganic chemistry and introduces organic chemistry. It covers periodic trends across Period 3, the chemistry of Group II and Group VII including reactivity trends and halide tests, qualitative analysis with tests for ions and gases, organic nomenclature and structural isomerism, the reactions and mechanisms of alkanes, alkenes and haloalkanes, the chemistry of alcohols, and the use of infrared and mass spectrometry to identify compounds.

What organic mechanisms must I know for AS 2?

You must know free-radical substitution of alkanes (initiation, propagation, termination), electrophilic addition to alkenes with Markownikoff's rule, addition polymerisation, and the nucleophilic substitution and elimination reactions of haloalkanes. You should be able to draw the mechanisms with curly arrows and explain why each reagent behaves as a radical, electrophile or nucleophile.

How do I identify an organic compound from spectra in AS 2?

Use infrared spectroscopy to find functional groups from characteristic absorptions, such as a sharp C=O around 1700 wavenumbers and a broad O-H for alcohols and acids, and use the fingerprint region to confirm identity against a database. Use mass spectrometry to find the relative molecular mass from the molecular ion peak and to deduce structure from fragment ions. Combining both pins down the structure.

What is the single most common mistake in AS 2?

In inorganic chemistry, mixing up the Group II solubility trends (hydroxides more soluble, sulfates less soluble down the group) and forgetting to acidify before precipitate tests. In organic chemistry, predicting the wrong product for electrophilic addition by ignoring Markownikoff's rule, and confusing the conditions for nucleophilic substitution and elimination of haloalkanes.

How should I revise the AS 2 module?

Learn the periodic and group trends with their explanations, and drill the qualitative analysis tests as observation-plus-conclusion pairs. For organic chemistry, learn each homologous series as its reactions and mechanisms, practise drawing mechanisms with curly arrows, and rehearse interpreting infrared and mass spectra together. CCEA tests precise observations and named mechanisms directly.

Northern IrelandChemistry

CCEA A-Level Chemistry AS 2 Further Physical and Inorganic and Introduction to Organic: a complete overview

A deep-dive CCEA A-Level Chemistry guide to the AS 2 module. Covers periodic trends in Period 3, Group II and Group VII chemistry, qualitative analysis, organic nomenclature and isomerism, the chemistry of alkanes, alkenes, haloalkanes and alcohols, and infrared and mass spectrometry, with the mechanisms and tests CCEA examines.

Generated by Claude Opus 4.818 min readCCEAUpdated 2026-06-02

Reviewed by: AI editorial process; not yet individually human-reviewed

Jump to a section

What this module demands
Periodic and group trends
Qualitative analysis
Introduction to organic chemistry
Spectroscopy
How this module is examined
Check your knowledge

What this module demands

AS 2 Further Physical and Inorganic Chemistry and an Introduction to Organic Chemistry builds on AS 1 and opens the organic chemistry that dominates A2. It blends the periodic and group trends of inorganic chemistry, the practical tests of qualitative analysis, the naming and reactions of the first organic families, and the spectroscopic methods used to identify them. CCEA rewards precise observations, named mechanisms and the ability to combine spectral evidence.

This guide walks through the seven dot points of the module, then sets out the exam patterns CCEA repeats. Each topic has a matching dot-point page with practice questions; this overview ties them together.

Periodic and group trends

Periodic trends cover the patterns in atomic radius, ionisation energy and melting point across Period 3, with the structures and the acid-base character of the oxides. Group II and Group VII cover the reactivity, solubility and thermal stability trends of Group II, and the colour, volatility and oxidising power trends of the halogens, with displacement reactions and the silver nitrate tests for halide ions.

Qualitative analysis

Qualitative analysis is the practical strand: the tests for carbonate, sulfate, halide, ammonium and hydroxide ions, the tests for common gases, and flame tests, all learned as observation-and-conclusion pairs with the chemistry behind each.

Introduction to organic chemistry

Nomenclature and isomerism sets the language: IUPAC naming, homologous series, the types of formula, and structural isomerism. Alkanes, alkenes and haloalkanes introduce the core mechanisms: free-radical substitution, electrophilic addition with Markownikoff's rule, addition polymerisation, and nucleophilic substitution and elimination. Alcohols covers their classification, production by hydration and fermentation, and reactions by oxidation, dehydration and esterification.

Spectroscopy

Infrared and mass spectrometry are the analytical tools: infrared absorptions identify functional groups and the fingerprint region confirms identity, while the molecular ion gives the relative molecular mass and fragmentation reveals structure. Used together, they determine an unknown organic compound.

How this module is examined

A typical CCEA profile for AS 2:

Trends and explanations. Describing and explaining the Period 3, Group II and Group VII trends.
Practical tests. Stating the reagent, observation and conclusion for ion, gas and flame tests.
Mechanisms. Drawing free-radical, electrophilic addition and nucleophilic substitution and elimination mechanisms with curly arrows.
Spectra. Interpreting infrared and mass spectra and combining them to identify a compound.

Check your knowledge

A mix of recall, explanation and application questions covering the module. Attempt them under timed conditions, then check against the solutions.

Explain why first ionisation energy generally increases across Period 3. (2 marks)
Describe the trend in oxidising power down Group VII and explain it. (2 marks)
State the test and positive result for a carbonate ion. (2 marks)
Define a homologous series. (2 marks)
Name the three stages of free-radical substitution. (3 marks)
State the type of reaction when an alkene reacts with a hydrogen halide. (1 mark)
State the oxidation product of a primary alcohol oxidised under reflux. (1 mark)
State what the molecular ion peak in a mass spectrum tells you. (1 mark)

Sources & how we know this

CCEA GCE Chemistry specification — CCEA (2016)