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Chemical Reactions and Equations — Part 1: Equations, combination and decomposition

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Lesson

Chemical Reactions and Equations

Part 1 — what a reaction is, how to write and balance its equation, and two big families: combination and decomposition.

In this lesson you will

  • Spot the signs that a chemical reaction has taken place
  • Tell a chemical change from a physical change
  • Turn a word equation into a balanced chemical equation with state symbols
  • Classify a reaction as combination or decomposition
  • Give one example each of thermal, electrolytic and photolytic decomposition
2 Mg(s)+OX2(g)→2 MgO(s)\ce{2Mg(s) + O2(g) -> 2MgO(s)}
One line of chemistry tells the whole story of a burning sparkler wire.