AI STUDY METHOD PRESENTS
REVISION ARCADE
EVERY SUBJECT · EVERY LEVEL · 22 GAMES · COLLECT COINS
▶ ENTER FREE →
◆ INSERT COIN ◆
GCSE Chemistry Revision

Analysis & the Atmosphere

Tests for ions and gases, separating and identifying substances, the atmosphere, pollution and using resources.

Learn itInteractive mini-lessons for your exam boardPLAYQuick game on Analysis & the AtmosphereVelvet RevisionYour GCSE Chemistry course mapFree PDF100 AI prompts for GCSE Chemistry
Quick check · one tap
How does a pure substance melt?

Analysis & the Atmosphere is a core part of GCSE Chemistry. Revise the key concepts and common mistakes below, then lock them in with the free games.

Key concepts

Pure substanceOne element or compound — sharp melting point
MixtureTwo or more substances not chemically joined
FormulationUseful mixture made to exact quantities, e.g. paint
Mobile phaseThe solvent that moves up the paper
Stationary phaseThe paper the solvent moves through
BaselinePencil line where spots are placed at the start
Flame testHeat sample on wire — colour reveals the metal ion
PrecipitateInsoluble solid formed when two solutions mix
Sodium hydroxide testIdentifies metal ions by precipitate colour
Instrumental analysisMachine-based methods like spectroscopy
SensitiveDetects very small amounts of a substance
AccurateResult is very close to the true value
Rf valueDistance moved by spot ÷ distance moved by solvent
Solvent frontHighest point the solvent reaches on the paper

What your exam board covers

Where Analysis & the Atmosphere sits in each exam board's specification. Tap a board to see what it lists.

AQAChemistry of the atmosphereSpec 8462
  • The composition and evolution of the Earth's atmosphere
  • Carbon dioxide and methane as greenhouse gases
  • Common atmospheric pollutants and their sources

Source: AQA GCSE Chemistry (8462) specification — Subject content, accessed 23 June 2026.

Learn Analysis & the Atmosphere step by step

Free interactive mini-lessons: short screens, worked examples and quick checks. Pick your exam board:

Other boards:CCEAEdexcelEduqas/WJECOCRCambridge IGCSEEdexcel IGCSE

Common mistakes to avoid

Questions where students often pick the tempting wrong answer — make sure you know the right one:

How does a pure substance melt?✗ Gradually over a wide range of temperatures.   ✓ At a sharp, fixed temperature.
How does chromatography separate substances?✗ Only by colour — colourless substances can't be separated.   ✓ By how strongly each is attracted to the paper versus the solvent.

Practise Analysis & the Atmosphere — free games

Test yourself with these quick revision games for this topic:

▶ Two Truths, One Lie▶ Reveal Race▶ Connections Grid▶ Falling Words▶ Word Web

See all 22 games in the Revision Arcade →

More GCSE Chemistry topics

Atomic Structure & the Periodic TableBonding, Structure & PropertiesQuantitative ChemistryChemical ChangesEnergy ChangesRates & EquilibriumOrganic Chemistry
← GCSE Chemistry
Cover of 100 AI Prompts for GCSE Chemistry
Free · PDF
100 AI Prompts for GCSE Chemistry

Print-and-paste prompts built around the Velvet Method, so ChatGPT tests your thinking instead of doing it for you.

Download free PDF →All 91 free prompt books

← All revision guides

Want to revise every topic this smart?

The Velvet Method shows you how to use AI to revise any subject, in six steps.

See the Velvet Method →
Teaching GCSE Chemistry? Free interactive lessons to set as class work, homework or cover. No student login. AQA GCSE Chemistry teaching resources →