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5 Written Questions

5 Multiple Choice Questions

  1. water expands [because water molecules are kept seperated], and becomes less dense
    floats in liquid water
  2. atoms that have positive or negative charges
  3. the chemical bond that forms between two atoms when one or more electrons are transformed from one atom to anohter.
    happens when the electronegatives differ
    creates ions
  4. changes temperature very slowlyare stable in response to temperature changes of the surrounding air

    *when sweat evaporates, a large amount of heat is taken with it and cools your body
  5. tbe ability of an atom to attract an electron.
    most electronegative: F, O, N

5 True/False Questions

  1. Water as a solventAdhesion is the attraction between the unlike substances
    demonstrates capillary action


  2. Water -- Adhesionionic and polar substances dissolve in the water.
    hydrophillic vs hydrophobic


  3. Covalent Bondwhen the electrons aren't shared equally
    unequal distribution of charges
    \electrons are closer to the atom with the greater electronegativity and produces a negative charge


  4. Water -- Cohesion/Surface TensionStrong cohesion [attraction between water molecules]
    occurs because of hydrogen bonding
    High Surface Tension -- creates a water surface that is firm enough to allow insects to walk upon it


  5. Hydrogen bondweak bonds between molecules
    form when H+ is in a covalent bond, but is attracted to another molecule [usually with a high electronegativity] in another covalently bonded molecule


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