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1. Which of the following character does not apply to water?
a. The water molecule is asymmetric
b. The water molecule readily forms hydrophobic interactions
c. The covalent bonds in water are highly polarized
d. All three atoms in the water molecule readily form hydrogen bonds
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Answer: (b).The water molecule readily forms hydrophobic interactions

2. Weak acids generally have pKa
a. 10^-14 Mvalues less than 1
b. 10^14 MpKa values greater than 2
c. 10^-7 Mbeen seldom found in living systems
d. 10^7 Mthat cannot be used to buffer
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Answer: 10^-14 MpKa values greater than 2

3. The reason that fats contain more energy than simple sugars, is fats have many more
a. carbon atoms
b. hydrogen atoms
c. covalent bonds
d. hydrogen bonds
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Answer: (c).covalent bonds

4. The main difference between an acid and a base is that
a. bases are polar molecules and acids are not
b. acids are polar molecules and bases are not
c. bases donate hydrogen ions in water while acids accept hydrogen ions
d. acids donate hydrogen ions in water while bases accept hydrogen ions
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Answer: (d).acids donate hydrogen ions in water while bases accept hydrogen ions

5. A solution with pH = 5 is __________ than a solution with pH = 7.
a. 2 times more basic
b. 10 times more basic
c. 10 times more acidic
d. 100 times more acidic
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Answer: (d).100 times more acidic

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