26 Terms from Chapter 2

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