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OCR A Level Chemistry A – Module 2 Foundations in Chemistry

Equations and Reaction Types

Equations and reaction types link chemical formulae to what actually happens during a chemical change. These pages build from writing balanced chemical equations through to recognising acid reactions and writing ionic equations.

Exam Paper
Paper 1 & 2
H432/01 and H432/02
Specification Points
2.1.2(b)
1 point covered
Sub-topics
3 lessons
Revision notes available
Exam Board
OCR
H432 (2015 onwards)

Revision Notes

3 revision notes, in the order the specification teaches them.

A level balance with the same atoms in each pan
1

Writing Chemical Equations

Revise word equations, symbol equations, balancing equations and the correct use of state symbols.

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Metal fizzing in acid beside a pile of carbonate powder
2

Typical Reactions of Acids

Learn the common products formed when acids react with metals, bases, alkalis and carbonates.

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Two ions joining in solution while spectator ions stay apart
3

Ionic Equations

Learn how ionic equations show only the reacting ions and remove spectator ions from chemical equations.

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Summary Map

Download, print and revise the key facts of this topic at a glance.

Summary map

Download, print and revise the key facts of this topic at a glance.

Illustration of a summary map: compounds joined by reaction arrows
Summary map · PDF

Formulae and Equations Map

OCR A Level Chemistry A · 2.1.2 Compounds, formulae and equations

The whole of 2.1.2 on one A4 page: ion charges, the ions to learn, balancing, state symbols, ionic equations and unfamiliar reactions.

Download the map6 key ideas + an equations table · A4 portrait · print ready

© 2026 Online Learning System. For personal study: printing is allowed; editing, copying and redistribution are not.

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Written, drawn and worked exam practice on this topic.

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Revision Game

Match reagents to products, with your board's reagents and conditions.

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Study Cards

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Specification

Every specification point in this topic, in the exam board's own words. Rate how confident you are with each one.

Official OCR documentsSpecification (opens the OCR website in a new tab)Data sheet (opens the OCR website in a new tab)

Self-assessment · 12 points

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2.1.2

  1. a

    the writing of formulae of ionic compounds from ionic charges

    Revise
  2. a (i)

    prediction of ionic charge from the position of an element in the periodic table

    Revise
  3. a (ii) a

    recall of the name and formula for the nitrate ion, NO3–

    Revise
  4. a (ii) b

    recall of the name and formula for the carbonate ion, CO32–

    Revise
  5. a (ii) c

    recall of the name and formula for the sulfate ion, SO42–

    Revise
  6. a (ii) d

    recall of the name and formula for the hydroxide ion, OH–

    Revise
  7. a (ii) e

    recall of the name and formula for the ammonium ion, NH4+

    Revise
  8. a (ii) f

    recall of the name and formula for the zinc ion, Zn2+

    Revise
  9. a (ii) g

    recall of the name and formula for the silver ion, Ag+

    Revise
  10. b i

    construction of balanced chemical equations, including state symbols, for reactions studied

    Revise
  11. b ii

    construction of balanced ionic equations, including state symbols, for reactions studied

    Revise
  12. b iii

    construction of balanced chemical equations (including ionic equations), including state symbols, for unfamiliar reactions given appropriate information

    Revise