4. Types of intermolecular forces 1) Permanent dipole – dipole forces 2) Van der Waals’ forces 3) Hydrogen bonding
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9. Average charges are spread evenly At any instance the electrons are concentrated on one side of the atom or molecule more than the other. This gives the atom or molecule a temporary partial negative charge - a temporary dipole moment. This dipole moment will induce a temporary dipole in a neighboring atom by attracting/repelling its electron charge cloud.  A fraction of a second later the electron distribution changes causing and the temporary dipole-dipole attraction ( Van der Waals attraction) to break. These forces are weaker than hydrogen bond and permanent dipole forces.
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14. Structure of ice Four hydrogen bonds, two through its hydrogen atoms and two through its oxygen atoms hold each water molecule in place