WATER, PH AND MACROMOLECULES QUIZ

at pH values around neutrality

if their concentration is kept low

only in combination with polyprotic bases

at pH values around any of their pKa's

should act as a good buffer for acids and bases

contains at least some polar covalent bonds

is probably held together by noncovalent bonds

does not dissolve well in water

can all form covalent bonds with other elements

All of these

contain protons and neutrons in their atomic nuclei

are common elements in the molecules that make up living organisms

form covalent bonds in ice

carry a partial negative charge

are not important for the properties of water

carry a partial positive charge

Nonpolar substances like oils are not soluble in it

It is critical for many of the chemical processes found in living systems

Polar substances that can form hydrogen bonds will dissolve in it

All of these

acids

ions

molecules

none of these

All three atoms in the water molecule readily form hydrogen bonds

The covalent bonds in water are highly polarized

The water molecule readily forms hydrophobic interactions

The water molecule is asymmetric

tend to maintain a relatively constant pH.

will always have a pH of 7

cause a decrease in pH when acids are added to them.

are rarely found in living systems

its conjugate base

its conjugate acid

a hydronium ion

highly reactive

make nonpolar covalent bonds with the positively charged ions only

form hydrogen bonds with the positively and negatively charged ions

surround the ions because of their charge but do not form hydrogen bonds

share electrons with the ions to make polar covalent bonds