Question about hydrophobic interactions

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Reference no: EM1381840

Which of the following groups can be involved in hydrophobic interactions?
Select one:
a. -CH3
b. -COOH
c. -COH
d. -NH2
e. None of the above

Which of the following molecules is polar?
Select one:
a. CH4
b. O2
c. CO2
d. NH3

Which of the following weak acids would make the best buffer at pH = 5.0?
Select one:
a. acetic acid (Ka = 1.74 X 10E-5, pKa = 4.76)
b. H2PO4- (Ka = 1.38 X 10E-7, pKa = 7.20)
c. bicarbonate (Ka = 6.3 X 10E-11, pKa = 10.24)
d. tris-hydroxymethyl aminomethane (Ka = 8.32 X 10E-9, pKa = 8.07)
e. lactic acid (Ka = 1.38 X 10E-4, pKa = 3.86)

When a solution of acetic acid is titered with 0.5 molar equivalents of OH-, the resulting pH is-
Select one:
a. 0.5
b. pKa
c. 0.5 x pKa
d. Very high
e. Can't tell from the information provided

Which pair of molecules is able to participate in hydrogen bonding?
Select one:
a. Methane and water
b. Ammonia and carbone dioxide
c. Water and Methane
d. Ammonia and water
e. All of the above

Reference no: EM1381840

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