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Water, pH and Macromolecules

Water, pH and Macromolecules
The reason that fats contain more energy than simple sugars, is fats have many more

hydrogen atoms
covalent bonds
carbon atoms
hydrogen bonds

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

noncovalent
covalent
ionic
hydrogen

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Water, pH and Macromolecules
The elements oxygen, nitrogen, and carbon

contain protons and neutrons in their atomic nuclei
can all form covalent bonds with other elements
are common elements in the molecules that make up living organisms
All of these

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Water, pH and Macromolecules
The dissociation constant of H2O at 25° C is

10-14 M
1014 M
10-7 M
107 M

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

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

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

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

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