key terms

1234567891011121314151617181920212223
Across
  1. 1. a chemical reaction that breaks down compounds into simpler products
  2. 3. a material that releases energy when it burns
  3. 6. system a system in which matter can enter from or escape to the surrounding
  4. 9. property
  5. 10. the amount of one material in a certain volume of another material
  6. 12. a biological catalyst that lowers the activation energy of reaction in cells
  7. 13. that has mass and take up space
  8. 15. a substance formed as a result of a chemical reaction
  9. 17. a chemical reaction in which two or more simple substance combine to form a new,more complex substance
  10. 18. reaction in which substance undergo chemical change that result in the formation of a new substance
  11. 21. a material that decreases the rate of a reaction
  12. 23. a material that increases the rate of a reaction by lowering the activation energy
Down
  1. 2. a number in front of a chemical formula in a equation that indicates how many molecules or atom of each reactant and product are involved in a reaction
  2. 4. reaction that releases energy in the form of heat.
  3. 5. of mass the principle stating that matter is not created or destroyed during a chemical reaction
  4. 7. a rapid reaction between oxygen and fuel that results in fire
  5. 8. a reaction in which one element replaces another in a compound.
  6. 11. the study of the properties of matter and how matter change
  7. 14. reaction that absorbs energy in the form of heat.
  8. 16. property a substance that describes its ability to change into different substances
  9. 18. system a system in which no matter is allowed to enter or leave
  10. 19. energy the minimum amount of energy needed to get a chemical reaction started
  11. 20. equation a short way to show a chemical reaction using symbols.
  12. 22. a substance that enters into a chemical reaction