Balance atoms, preserve the substances
Balance an equation by changing coefficients, count every atom and distinguish an amount ratio from a mass ratio.
Open the complete free lessonChemistry → Senior Secondary / GCSE / IGCSE / HS → Chemical Formulae, Equations & Representation
Chemical equations, state symbols and conservation
FREE LESSON AVAILABLEWrite/balance equations as conservation statements and interpret coefficients as particle/mole ratios
Start with the right foundation.
- correct formulae
- atom counting
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Related topics and learning continuation.
Writing and naming chemical formulae
Translate reliably between names and formulae while preserving composition and accepted nomenclature
Chemical symbols, ions, charges and formula units
Construct neutral formulae and reason with oxidation numbers without confusing coefficients and subscripts
Relative mass, molar mass and mass-mole-particle conversions
Move among mass, moles and particle count while preserving formula composition and units
Learn free: The mole connects a balance to particlesAtomic structure, nuclear notation and models
Relate proton/neutron/electron counts to atomic/mass number, charge and identity
Learn free: Count particles without changing the elementParticle model, states of matter and diffusion
Use particle arrangement/motion to explain bulk state changes and diffusion
Learn free: The particles do not meltGet personal help with this topic.
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