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Some examples from this set of practice questions
1.
in order to be polar a molecule must satisfy which 2 conditions?
Answer: 1. have polar covalent bonds inside 2. have an asymmetrical shape
2.
STRONG bonds between ATOMS that are formed by UNEQUAL SHARING of valence electrons
Answer: polar covalent bonds
3.
STRONG bonds between ATOMS that are formed by EQUAL SHARING of valence electrons
Answer: nonpolar covalent bonds
4.
WEAK bonds between MOLECULES that do NOT INVOLVE SHARING of valence electrons (2 types; also see Chapter 2)
Answer: 1. H-bonds 2. van der Waals attractions
5.
H-bonds form between
Answer: the DELTA POSITIVE H atom of the FIRST POLAR MOLECULE and a DELTA NEGATIVE O, N or F atom of a SECOND POLAR MOLECULE
6.
water covers ______ % of the earth
Answer: 75%
7.
cells are _______ - _______ % water
Answer: 70-95%
8.
cohesion
Answer: when a polar molecule H-BONDS to polar molecules of the SAME kind
9.
adhesion
Answer: when a polar molecule H-BONDS to polar molecules of a DIFFERENT kind
10.
surface tension
Answer: the property of a liquid that keeps forces from breaking through its surface (occurs due to increased H-bonding between surface molecules)
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