PS: Unit 3 Chapter 2

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Across
  1. 3. new substance formed as a result of a chemical reaction
  2. 5. substance present before a chemical reaction and then undergoes change
  3. 7. number written in front of a chemical formula in a chemical equation
  4. 8. substance used to slow down or stop a chemical reaction
  5. 9. chemical reaction that absorbs heat
  6. 12. type of reaction where the number of atoms of each element on the reactant is equal to those on the product side
  7. 17. type of chemical reaction that has oxygen as a reactant
  8. 19. measure of the change in concentration of the reactants over a period of time
  9. 20. name given to catalysts that exist in the human body
  10. 21. what happens to an atom when it gains an electron
  11. 22. type of chemical reaction where two or more reactants combine to form a product
  12. 23. (l) indicates that the substance is in what state?
Down
  1. 1. type of chemical reaction where a substance is broken down into two or more products
  2. 2. (s) indicates that the substance is in what state?
  3. 4. what happens to an atom when it loses an electron
  4. 6. minimum amount of energy required to start a chemical reaction
  5. 8. type of bond where atoms lose or gain electrons
  6. 10. (g) indicates that the substance is in what state?
  7. 11. type of replacement reaction indicated by AB + DC = AC + DB
  8. 13. substance that increases reaction rate without being used up
  9. 14. chemical reaction that releases heat
  10. 15. reaction that absorbs more energy at the beginning then is released
  11. 16. reaction that releases more energy than what is necessary to start the reaction
  12. 18. type of replacement reaction indicated by A + BC = AC + B