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Reactions rearrange atoms

Reactions rearrange atoms

Balanced particle diagram showing two H2 molecules and one O2 molecule forming two H2O molecules with equal H and O atom counts before and after

A chemical reaction happens when atoms are rearranged to make new substances. The starting substances are reactants, and the new substances are products.

Introducing chemical reactions Lesson

  1. GCSE
  2. /Combined Science
  3. /Introducing chemical reactions