IGCSE Atoms, Elements & Compounds Crossword

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Across
  1. 3. An acid reacts with a base (or alkali) to form a salt and water. (15)
  2. 7. An ion that does not take part in a reaction. (9, 3)
  3. 11. A chemical reaction that releases heat energy. (10)
  4. 12. A substance that is present at the start of a reaction. (8)
  5. 13. A chemical reaction that absorbs heat energy. (11)
Down
  1. 1. Symbols used in chemical equations to show states of matter. (5, 7)
  2. 2. A substance that reacts with oxygen to produce carbon dioxide and water. (4)
  3. 4. A loss of oxygen or a gain of electrons. (9)
  4. 5. A chemical reaction where one reactant breaks down into two or more simpler substances or products. (13)
  5. 6. The scientific term for burning. (10)
  6. 8. A substance that is present at the end of a reaction. (7)
  7. 9. A more reactive element replaces a less reactive element from its compound. (12)
  8. 10. A gain of oxygen or a loss of electrons. (9)