Exo/endo crossword

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Across
  1. 4. A substance that reacts together with another substance to form products during a chemical reaction
  2. 6. Electrically charged particle, formed when an atom or molecule gains or loses electrons
  3. 7. A substance formed in a chemical reaction
  4. 9. Reaction in which energy is given out to the surroundings
  5. 10. In chemical reactions, a situation where the forward and backward reactions happen at the same rate, and the concentrations of the substances stay the same
  6. 12. A substance that changes the rate of a chemical reaction without being changed by the reaction itself
  7. 13. A collection of two or more atoms held together by chemical bonds
Down
  1. 1. Containing water of crystallisation, which can be removed by heating strongly
  2. 2. Mixture formed by a solute and a solvent
  3. 3. A substance containing no water
  4. 5. Reaction in which energy is taken in
  5. 8. A chemical reaction which can go both ways
  6. 11. A straight line that just touches a point on a curve