5th six weeks review

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Across
  1. 3. a chemical reaction that uses pure elements to make compounds
  2. 5. a chemical reaction where two ionic substances swap anions (or cations)
  3. 8. a chemical reaction where an ionic substance has one of its ions replace with a new one
  4. 10. a mixture of metal and metal oxide that can undergo a VERY HOT single replacement reaction
  5. 11. a molecule that does not have a distinct positive or negative side
  6. 12. in a chemical formula, this number indicates how many of that atom or group are required to make that molecule
  7. 18. the electric charge on a proton
  8. 21. a chemical reaction that uses 1 compound to make two or more simpler substances
  9. 23. the chemicals you use in a reaction should weigh the same before and after
  10. 24. the electric charge on an electron
  11. 27. molecules with four regions of electron density around a central atom's valence shell have this geometry
Down
  1. 1. hydrogen peroxide slowly decomposes, we add this to make chemical reactions go faster
  2. 2. when a molecule has one or more bonds between hydrogen and oxygen, fluorine, or nitrogen it experiences this attractive force
  3. 4. these electrons are the ones involved in forming chemical bonds
  4. 6. this property determines if two atoms will form an ionic, polar or nonpolar covalent bond
  5. 7. molecules with four regions of electron density around a central atom's valence shell, but only two of them are bonds have this geometry
  6. 9. this process will decompose water into hydrogen and oxygen gases
  7. 13. the most electronegative atom
  8. 14. this type of chemical reaction generally uses oxygen and releases carbon dioxide
  9. 15. this type of reaction usually requires energy
  10. 16. required for combustion
  11. 17. one of many chemicals that is composed of *mostly* carbons and hydrogens, generally required for combustion
  12. 19. the only parts of a chemical equation you are allowed to change while balancing
  13. 20. a collection of atoms that are covalently bonded to one another
  14. 22. a molecule that has a slightly positive side and a slightly negative side
  15. 25. these elements react with water in a single-replacement reaction
  16. 26. in a chemical equation, this number goes in front of a chemical formula to indicate how many molecules are required to balance the equation