Water/pH check

The bonds between the hydrogen and oxygen atoms within a water molecule are called

• covalent bonds

• hydrogen bonds

• ionic bonds

• metallic bonds

Square brackets, [], in chemistry mean

• pH

• solubility

• concentration

• logarithim

The most abundant compound in cells is

• carbon dioxide

• oxygen

• water

• sodium chloride

Water is a _ molecule, therefore _ substances dissolve in it.

• Polar, Nonpolar

• Nonpolar, nonpolar

• Polar, polar and ionic

• Nonpolar, polar or ionic

A substance that has a pH of less than 7 is

• a base

• neutral

• an acid

• alkaline

The concentration of hydrogen ions in a solution with a pH of 2 is _ than that of a solution with a pH of 4.

• less than

• greater than

Water has a high heat capacity, thus allowing organisms to

• Cool themselves through evaporation

• Maintain a relatively stable internal temperature

• Draw water up thin vessels

• Live beneath the less dense solid ice in an aquatic environment

A substance that resists changes in pH is know as a

• Base

• Catalyst

• Solvent

• Buffer

Aquatic organisms can survive under an insulating layer of ice through the winter due to water's

• High heat of vaporization

• Unique density change upon freezing

• excellent solvent

• High heat capacity/specific heat

Water is one of the greatest _ found on earth.

• Solutes

• Solvents