Science

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