Science

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