AP Test Unit 0 and Unit 1

Which of the following does not result from hydrogen bonding in water molecules?

• Cohesion

• Adhesion

• Surface Tension

• Dissolving fats

Which property allows for the survival of aquatic organisms in the winter?

• ice is less dense than water, it floats and insulates the water below

• cohesion

• adhesion

• capillary action

How is water's high heat of vaporization important to life?

• organisms can use this property to cool themselves, through sweating or bathing in water

• aquatic organisms are more likely to survive cold temperatures

• water striders can walk on water

• this causes ice to float

Which of the following describes the property of water where water molecules are able to hydrogen bond with each other?

• cohesion

• adhesion

• van der Waals forces

• hydrophobic interactions

Which of the following describes the bonds between two water molecules?

• the negative oxygen of one water molecule will form hydrogen bonds with the positive hydrogens of another water molecule

• the negative hydrogens of one water molecule will form hydrogen bonds with the positive oxygens of another water molecule

• the negative oxygen of one water molecule will form ionic bonds with the positive hydrogens of another water molecule

• The positive hydrogens of one water molecule will form covalent bonds with the positive hydrogens of another water molecule

which correctly describes the distribution of charge within a water molecule?

• oxygen is partially negatively charged and hydrogens are partially positively charged

• water molecules are uncharged

• water molecules are positively charged

• hydrogen is partially negatively charged and oxygens are partially positively charged

Which properly describes the bonds within a single water molecule?

• polar covalent bonds, unequal distribution of electrons

• ionic bonds

• nonpolar covalent bonds, equal distribution of electrons

• hydrogen bonds

The rate of transpiration refers to the rate at which a plant

• loses water through evaporation

• gains water through its roots

• takes in CO2

• removes O2

Which of the following effects can occur because of the high surface tension of water?

• Lakes cannot freeze solid in winter, despite low temperatures.

• A raft spider can walk across the surface of a small pond.

• Organisms can resist temperature changes, although they give off heat due to chemical reactions.

• Sweat can evaporate from the skin, helping to keep people from overheating.

Transpiration involves which of the following?

I) adhesion of water molecules to xylem walls

II) cohesion between water molecules

III) transport of water from the roots to the leaves

IV) evaporation of water molecules

• I, III, and IV

• I, II and IV

• I, II, III, and IV

• I, II, and III