What this topic covers
Topic 2: States of matter and mixtures has 3 subtopics:
- Purity, formulations and chromatography
- States of matter and state changes
- Using the Earth's resources and obtaining potable water
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GCSE Edexcel Higher Combined Science Chemistry · Topic 2 of 7
Topic 2: States of matter and mixtures – GCSE Edexcel Higher Combined Science Chemistry revision notes
Choose a subtopic. Explore states of matter, how mixtures are separated, and how purity is tested. 13 lessons in 3 subtopics.
Revise Topic 2: States of matter and mixtures for GCSE Edexcel Higher Combined Science Chemistry, including Purity, formulations and chromatography.
13
Lessons
3
Subtopics
Topic 2: States of matter and mixtures lessons by subtopic
13 lessons, grouped by subtopic.
Purity, formulations and chromatography
- What is a Pure Substance?
- Using Melting and Boiling Points to Test Purity
- Understanding Formulations
- Paper Chromatography - Principles and Applications
- Chromatogram Analysis and Rf Values
- Core practical: simple distillation and paper chromatography of inks
States of matter and state changes
- States of Matter and Particle Theory
- Energy Changes and Forces Between Particles
- State Symbols in Chemical Equations
Using the Earth's resources and obtaining potable water
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Frequently asked questions
What is Topic 2: States of matter and mixtures?
Explore states of matter, how mixtures are separated, and how purity is tested. 13 lessons in 3 subtopics.
What is a chromatogram?
A chromatogram is the pattern of separated substances produced by chromatography, showing spots at different distances from the origin. The Chromatogram Analysis and Rf Values notes cover this in full.
What are the changes of state?
The changes of state are melting (solid to liquid), freezing (liquid to solid), boiling (liquid to gas) and condensing (gas to liquid). The States of Matter and Particle Theory notes cover this in full.
How do you calculate an Rf value?
Rf = distance moved by substance ÷ distance moved by solvent, both measured from the origin. The Chromatogram Analysis and Rf Values notes cover this in full.
What is reverse osmosis?
Reverse osmosis is a desalination method that uses high pressure to force water molecules through a semi-permeable membrane, which blocks salt ions. The Water Treatment for Different Sources notes cover this in full.
What is potable water?
Potable water is water that is safe to drink, with sufficiently low levels of dissolved salts and microbes. The What is Potable Water and How Do We Make It? notes cover this in full.
What is the melting point of aspirin?
Pure aspirin melts at 135°C. The Using Melting and Boiling Points to Test Purity notes cover this in full.
What is a formulation?
A formulation is a mixture that has been designed as a useful product, where each component has a specific purpose and is present in carefully measured quantities. The Understanding Formulations notes cover this in full.
What is a boiling point?
A boiling point is the temperature at which a liquid changes to a gas (boiling) or a gas changes to a liquid (condensing). The States of Matter and Particle Theory notes cover this in full.