Science Vocabulary

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Across
  1. 4. a way to describe a chemical reaction using chemical formulas and other symbols
  2. 5. the substances that react
  3. 6. a substance that speeds up a chemical reaction without changing itself
  4. 8. when one element replaces another in a compound
  5. 15. when two or more substances combine to form a new substance
Down
  1. 1. when a substance reacts with oxygen to produce energy in the form of heat and light
  2. 2. the balancing process that involves changing coefficients in a reaction
  3. 3. the minimum amount of energy needed to start a reaction
  4. 7. when the positive ion of one compound replaces that of another compound to form two new compounds
  5. 9. when one substance breaks down into another substance
  6. 10. the new substances produced
  7. 11. when energy is given off as heat
  8. 12. the speed at which reactants are consumed and products are given
  9. 13. substances used to slow a chemical reaction
  10. 14. Reaction when energy is needed in the form of heat