Science

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Across
  1. 3. Breaks down compounds into simpler products
  2. 4. Matter is not allowed to enter or leave
  3. 6. When one element replaces another in a compound
  4. 7. It can be observed without changing a substance into another substance
  5. 11. When the reaction is complete, you have a substance
  6. 13. Has mass and take up space
  7. 16. Is the amonut os a substance in a given volume
  8. 17. The cells of the body (as in all living things) contain biological catalysts
  9. 18. The substance you have at the beginning
  10. 19. The study of matter and how it changes
Down
  1. 1. A material used to decrase the rate of a reaction
  2. 2. Substance that describes its abilty to change into other substance
  3. 5. A rapid reaction between oxygen and a substance called a fuel
  4. 7. Is any change of alters
  5. 8. The minimum amount of energy needed to start a chemical reaction
  6. 9. Solid that forms from a solution during a chemical reaction
  7. 10. Matter can enter from or escape to the surroundings
  8. 12. Is a material that increases the rate of a reaction by lowering the activation energy
  9. 14. When two or more elements or compounds combine to make a more complex substance
  10. 15. Is a material that releases energy when it bruns