Science

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