Chapter 22 (Compounds) and 23 (Chemical Reactions)

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Across
  1. 3. A substance written to the right of the arrow in a chemical equation
  2. 5. A change that releases energy
  3. 10. Law of _______ of Matter
  4. 11. statement that atoms will gain, lose, or share electrons so that they will have 8 electrons in their outer energy levels
  5. 13. A substance written to the left of the arrow in a chemical equation
  6. 14. Describes an equation with the same number of atoms of each element on both sides of the arrow
  7. 15. AB --> A + B
  8. 18. electrons in the outer energy level
  9. 20. A substance that speeds up a reaction without being changed itself
  10. 22. A change that absorbs energy
  11. 23. The energy needed to start a combustion reaction
  12. 26. A substance that slows down a chemical change
Down
  1. 1. A+ BC --> AC + B
  2. 2. Carbon-compound + O2 --> CO2 + H20
  3. 4. A shorthand representation of a chemical reaction
  4. 6. forms when atoms lose electrons to form positive ions
  5. 7. a substance composed of only one type of atom
  6. 8. A number written below and to the right of the element symbol in a chemical formula
  7. 9. AB + CD --> AD + CB
  8. 12. A number written in front of a chemical formula
  9. 16. a substance composed of 2 or more elements
  10. 17. A + B --> AB
  11. 19. neither positive nor negative
  12. 21. forms when two atoms share one or more pairs of electrons
  13. 24. force of attraction between oppositely charged ions
  14. 25. forms when atoms gain electrons to form negative ions