Observing Chemical Change

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