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Stoichiometry - Formulae, Word & Symbol Equations

Chemistry: Cambridge International GCSE Supplement, topic 3.1.3

Stoichiometry - Formulae, Word Equations & Symbol Equations

Stoichiometry studies the quantities of substances in chemical reactions.

What is stoichiometry?

What is stoichiometry?

  • Stoichiometry uses formulae and equations to represent reactions.
  • Good stoichiometry helps predict reaction outcomes and products.
Writing word equations

Writing word equations

  • Word equations show reactants and products as names of substances.
  • Word equations do not show amounts or states of matter.
  • Example: Hydrogen + Oxygen → Water.
Writing symbol equations

Writing symbol equations

  • Symbol equations use chemical symbols and formulae for substances.
  • Symbol equations show the elements and compounds involved.
  • Example: H2 + O2 → H2O.
Balancing symbol equations

Balancing symbol equations

  • Balancing ensures the same number of each atom on both sides.
  • Balancing follows the Law of Conservation of Mass.
  • Adjust coefficients before formula subscripts when balancing.

Test yourself on Stoichiometry - Formulae, Word & Symbol Equations

  • What does stoichiometry study?

  • Balancing Symbol Equations

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