Water, pH and Macromolecules
Buffer solutions

tend to maintain a relatively constant pH.
cause a decrease in pH when acids are added to them.
will always have a pH of 7
are rarely found in living systems

ANSWER DOWNLOAD EXAMIANS APP

Water, pH and Macromolecules
Salt dissolves well in water as water molecules

share electrons with the ions to make polar covalent bonds
surround the ions because of their charge but do not form hydrogen bonds
form hydrogen bonds with the positively and negatively charged ions
make nonpolar covalent bonds with the positively charged ions only

ANSWER DOWNLOAD EXAMIANS APP

Water, pH and Macromolecules
Which of the following character does not apply to water?

The water molecule readily forms hydrophobic interactions
All three atoms in the water molecule readily form hydrogen bonds
The water molecule is asymmetric
The covalent bonds in water are highly polarized

ANSWER DOWNLOAD EXAMIANS APP

Water, pH and Macromolecules
Which of the following statements about water is correct?

All of these
It is critical for many of the chemical processes found in living systems
Polar substances that can form hydrogen bonds will dissolve in it
Nonpolar substances like oils are not soluble in it

ANSWER DOWNLOAD EXAMIANS APP