CH 6&7 SCHOOLOGY

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Across
  1. 1. a chemical reaction in which one element takes the place of another element in a compound
  2. 3. a chemical reaction in which two compounds exchange positive ions and form new compounds
  3. 5. a chemical reaction in which a compound breaks down into two or more simpler substances
  4. 8. an ion with a positive charge
  5. 10. the force that holds atoms or ions together as a unit
  6. 11. a diagram of an atom, ion or molecule in which each dot represents a valence electron
  7. 12. a chemical reaction in which two or more substances react to form a single substance
  8. 17. numbers that appear before a formula in a chemical equation to show the relative proportions of each reactant and product
  9. 18. a neutral group of atoms that are joined together by one or more covalent bonds
  10. 19. the energy stored in chemical bonds
  11. 20. a mixture of two or more elements, at least one of which is a metal, that has the characteristic properties of a metal
Down
  1. 2. the attraction between a metal cation and the shared electrons that surround it
  2. 4. the force that holds cations and anions together
  3. 6. a chemical bond in which two atoms share a pair of valence electrons
  4. 7. a substance that undergoes change in a chemical reaction
  5. 9. a representation of a chemical reaction in which the reactants and products are expressed as formulas
  6. 13. an atom or group of atoms that has a positive or negative charge
  7. 14. an ion with a negative charge
  8. 15. new substances formed as a result of a chemical reaction
  9. 16. notation that shows what elements a compound contains and the ratio of the atoms or ions of these elements in the compound