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 neutrality
only in combination with polyprotic bases
at pH values around any of their pKa's

ANSWER DOWNLOAD EXAMIANS APP

Water, pH and Macromolecules
Which of the following statements about covalently bonded molecules is false?

Such molecules often result from the interaction of ionized atoms
Noncovalent bonds may also be present, especially if the molecule is large
Electrons are shared between the atoms that make up the molecule
The chemical bonds that hold the molecule together are relatively strong

ANSWER DOWNLOAD EXAMIANS APP

Water, pH and Macromolecules
Hydrogen bonds and hydrophilic interactions are types of

strong chemical bonds that link together separate molecules
strong chemical bonds that hold together the atoms within a molecule
weak chemical bonds that link together separate molecules
weak chemical bonds that hold together the atoms within a molecule

ANSWER DOWNLOAD EXAMIANS APP