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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 bonds
hydrogen atoms
covalent bonds
carbon atoms

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

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

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

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

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Water, pH and Macromolecules
The pH of a solution is determined by

concentration of salt
dielectric constant of the medium
relative concentration of acids and bases
environmental effect

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Water, pH and Macromolecules
What is the concentration, in moles/liter, of the hydrogen ion, if pH of a solution is 7?

5 x 10-7
1 x 10-7
7
7 x 10-7

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Water, pH and Macromolecules
The lone pair electrons on oxygen in a H20 molecule

form covalent bonds in ice
are not important for the properties of water
carry a partial negative charge
carry a partial positive charge

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