Science

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