Y8 Reactions Key words

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Across
  1. 3. states that no atoms are lost or made in a chemical reaction.
  2. 4. A substance that reacts together with another substance to form products during a chemical reaction.
  3. 6. Occur when a new substance is formed.
  4. 9. Type of reaction in which a compound breaks down to form two or more substances when it is heated.
  5. 12. Reaction in which energy is given out to the surroundings.
  6. 13. Gases or other substances can enter or leave during a reaction.
  7. 14. The process of burning by heat.
  8. 15. Occur when the form of a chemical substance is changed (rather than what a substance is made of).
Down
  1. 1. Chart showing the energy in the reactants and products, and the difference in energy between them.
  2. 2. The minimum amount of energy that colliding particles must have for them to react.
  3. 5. No substances can enter or leave during a reaction.
  4. 7. Scientific skill whereby scientists receive knowledge of the outside world through our sense.
  5. 8. Reaction in which energy is taken in from the surroundings.
  6. 10. A substance formed in a chemical reaction.
  7. 11. A catalyst is a substance that speeds up a chemical reaction without being used up or chemically changed.