Chemical Reactions Vocab

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Across
  1. 2. substances that undergo a chemical change
  2. 5. amount of a substance in a given volume
  3. 7. _____change: any change that alters the form or appearance of a substance without changing it into a different substance
  4. 9. biological catalysts that help speed up chemical reactions
  5. 10. number placed in front of chemical formula in equation
  6. 12. new substances that form in a chemical reaction
  7. 16. _____replacement: when a single element replaces another single element in a compound
  8. 17. material used to decrease rate of chemical reaction
  9. 18. increases the reaction rate by lowering the activation energy needed
Down
  1. 1. _____replacement: when two elements exchange places in a reactions
  2. 3. _____ change: change of matter that produces new substances
  3. 4. _____energy: minimum amount of energy needed to start a chemical reaction
  4. 6. _____system: matter can enter from or escape to the surroundings
  5. 8. solid that forms from liquids during a chemical reaction
  6. 9. _____reaction: reaction that releases energy
  7. 11. _____reaction: reaction that absorbs energy
  8. 13. reaction when compounds break down into simpler substances
  9. 14. two or more elements combine to make a more complex substance
  10. 15. _____system: matter does enter or leave