crossword chemistry

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Across
  1. 1. reactants react to make this
  2. 4. addition of an oxygen atom
  3. 7. helps in speeding up a reaction
  4. 8. rusting of iron
  5. 10. reactions releasing energy
Down
  1. 2. change of taste and smell
  2. 3. more reactive element displaces less reactive
  3. 5. equating no. of atoms on both sides of an equation
  4. 6. reactions in which two reactants combine
  5. 9. oxidation and reduction