5.4 A world of reactions

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Across
  1. 2. Compounds containing only carbon and hydrogen.
  2. 4. Chemical reactions in which a fuel reacts with oxygen and heat is released.
  3. 5. Chemical reactions involving the transfer of electrons from the atoms of a more reactive metal to the ions of a less reactive metal.
  4. 6. Chemical reactions that wear away a metal.
  5. 9. Chemical reaction involving the loss of electrons by a substance.
Down
  1. 1. Chemical reactions in which two substances, usually elements, combine to form a compound.
  2. 3. Chemical reactions in which one single compound breaks down into two or more simpler chemicals.
  3. 7. Chemical reaction involving the gain of electrons by a substance.
  4. 8. Chemical reactions involving oxidation and reduction.