26 Terms from Chapter 2

12345678910111213141516171819202122232425
Across
  1. 2. a short easy way to show a chemical reaction using symbols instead of words
  2. 3. a reaction that releases energy in the form of heat
  3. 7. a rapid reaction between oxygen and a substance called fuel
  4. 8. the substances you have at the beginning
  5. 9. a number placed in front of a chemical formula in an equation
  6. 10. a characteristic of a substance that describes its ability to change into other substances
  7. 12. a material that increases the rate of a reaction by lowering the activation energy
  8. 13. the cells in your body contain biological catalysts
  9. 14. a characteristic of a substance that can be observed without changing the substance into another substance
  10. 16. anything that has mass and takes up space
  11. 17. a material that releases energy when it burns
  12. 19. a solid that forms from a solution during a chemical reaction
  13. 20. a principal that states that during a chemical reaction, matter is not created or destroyed
  14. 21. the amount of substance given volume
  15. 22. a material used to decrease the rate of a reaction
  16. 24. when two or more elements or compounds combine to make a more complex substance
  17. 25. matter is not allowed to enter or leave
Down
  1. 1. a reaction in which energy is absorbed
  2. 4. a change in matter that produces one or more new substances
  3. 5. a change that alters the form or appearance of a substance but that does not make a substance into another substance
  4. 6. when the reaction is complete
  5. 7. the study of matter and how matter changes
  6. 11. when one element replaces another in a compound or when two elements in different compounds trade places
  7. 15. the minimum amount of energy needed to start a chemical reaction
  8. 18. breaks down compounds into simpler products
  9. 23. matter can enter from or escape to the surroundings