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5 Written questions

5 Matching questions

  1. double covalent bond
  2. molecule
  3. cation
  4. chemical equillibrium
  5. energy level
  1. a different states of potential energy for electrons in an atom
  2. b sharing two pairs of valence electrons
  3. c positively charged ion
  4. d point at which reactions offset one another exactly, no effect on concentrations of reactants and products
  5. e two or more atoms held together by covalent bonds

5 Multiple choice questions

  1. mass of an atom
  2. charged atom
  3. attraction of an atom for the electrons
  4. anything that has mass and takes up space
  5. those required by an organism in only minute quantities

5 True/False questions

  1. energysubstance that cannot be broken down to other substances by chemical reactions


  2. mass numbernumber of protons


  3. molecular formularepresents both atoms and bonding


  4. isotopesmallest unit of matter that still retains the properties of an element


  5. covalent bondsharing of a pair of valence electrons by two atoms