Chemical reactions

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Across
  1. 4. when a compound breaks down in to two different substances
  2. 7. is when matter does not enter or leave
  3. 10. is when energy released as the products form is greater than the energy required to break the bonds of the reactions
  4. 12. the Law states that during a chemical reaction matter is not created or destroyed
  5. 14. a change that alters the form or appearance of a substance
  6. 16. the new substances that form
  7. 17. substances that undergo the chemical changes
  8. 18. when two or more elements combine to make a more complex substance
  9. 19. is a change in matter that produces one or more substances
Down
  1. 1. more energy is required to break bonds of the reactions than his released by the formation of the products
  2. 2. increases the reaction rate by lowering the activation energy needed
  3. 3. matter can enter from or escape to the surroundings
  4. 5. mixing of two liquids may form
  5. 6. when one element replaces another in a compound
  6. 7. is the amount of a substance in a given volume
  7. 8. a material used to describe the rate of a chemical reaction
  8. 9. the minimum amount of energy to start a chemical
  9. 11. biological catalysts
  10. 13. is away to show a chemical reaction using symbols instead of words
  11. 15. a number placed in front of a chemical formula in an equation