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Water, pH and Macromolecules

Water, pH and Macromolecules
Molecules in which the atoms are held together by __________ bonds have the strongest chemical linkages.

ionic
covalent
hydrogen
noncovalent

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Water, pH and Macromolecules
Which of the following will easily dissolve in a polar solvent?

gasoline (heptanes & octanes)
argon
sodium chloride
methane

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Water, pH and Macromolecules
A compound that is capable of forming hydrogen bonds with water

contains at least some polar covalent bonds
should act as a good buffer for acids and bases
is probably held together by noncovalent bonds
does not dissolve well in water

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Water, pH and Macromolecules
A Bronsted acid becomes __________ upon losing a proton.

highly reactive
its conjugate acid
its conjugate base
a hydronium ion

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Water, pH and Macromolecules
Polyprotic acids such as H3PO4, can act as acid-base buffers

only in combination with polyprotic bases
at pH values around any of their pKa's
at pH values around neutrality
if their concentration is kept low

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Water, pH and Macromolecules
Who discovered and described the blood groups (ABO) classification?

Karl Landsteiner
Karl Hooper
Theodor Kocher
Otto Warburg

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