AP Biology Chapter 3&4 Test

Water is transported in plant tissues against gravity due to which of the following properties?

All are produced by covalent bonding

The molecular mass of glucose is 180g. Which of the following procedures should you carry out to make a 1M solution of glucose?

Dissolve 180g of glucose in water, and then add more water until the total volume of the solution is 1L.

The slight negative charge at one end of one water molecule is attracted to the slight positive charge of another water molecule. What is this attraction called?

Hydrogen Bond

What gives rise to the cohesiveness of water molecules?

Hydrogen Bonds

Why does ice float in liquid water?

Hydrogen bonds stabilize and keep the molecules of ice farther apart than the water molecules of liquid water.

In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by:

Polar Covalent Bonds

Based on your knowledge of the polarity of water molecules, the solute molecule is most likely:

Positively charged

Pure, freshly-distilled water has a pH of 7. This means that:

The concentration of H+ ion in the water equals the concentration of OH- ions in the water.

Desert rabbits are adapted to the warm climate because their large ears aid in the removal of heat by

The high heat of vaporization of water

Temperature usually increases when water condenses. Which behavior is most directly responsible for this phenomenon?

The release of heat by the formation of hydrogen bonds.

Water's high specific heat is mainly a consequence of the:

absorption and release of heat when hydrogen bonds break and form

If the pH of a solution is increased from pH 5 to pH 7, it means that:

concentration of OH- is 100 times greater what it was at pH5

What is the maximum number of hydrogen bonds a water molecule can form with neighboring water molecules?

four

Which of the following solutions has the greatest concentration of hydrogen ions?

gastric juice at pH 2

What do cohesion, surface tensions, and adhesion have in common with reference to water?

hydrogen bonding

Which type of bond must be broken for water to vaporize?

hydrogen bonds

The formation of ice during colder weather helps temper the seasonal transition to winter. This is mainly because

the formation of hydrogen bonds releases heat

Life on Earth is dependent on all the properties of water as well as the abundance of water. Which property of water is probably most important for the functioning of organisms at the molecular level?

versatility as a solvent