chemistry

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Across
  1. 1. when metal react with water it gives out
  2. 3. periodic table is divided to groups and .....
  3. 6. when iron reacts with water
  4. 7. when oxygen is added to reaction
  5. 9. break easily under stress
Down
  1. 2. heat given out
  2. 4. heat taken in
  3. 5. reaction of aluminium with water is .....
  4. 8. chemical symbol is Al