Unit 9 - Water and the Hydrologic Cycle Quiz

Which of the following is NOT part of the hydrological cycle?

• precipitation

• condensation

• evaporation

• emancipation

Which of the following is most important when considering whether or not water is freshwater?

• salt content

• pollution

• temperature

• pH

Refer to the picture of water sticking to a leaf; this is occurring because of:

• Adhesion

• Cohesion

Describe COHESION.

• Water molecules attracted to other substances.

• Water molecules climbing upwards against the force of gravity.

• Water molecules dissolving many substances because of its polarity.

• Water molecules attracted to other water molecules.

Describe ADHESION.

• Water molecules attracted to other substances.

• Water molecules climbing upwards against the force of gravity.

• Water molecules dissolving many substances because of its polarity.

• Water molecules attracted to other water molecules.

Describe SURFACE TENSION.

• Water molecules climbing upwards against the force of gravity.

• Water molecules dissolving many substances because of its polarity.

• Measure of how difficult it is to break the surface of a liquid.

• Water molecules attracted to other substances.

What two elements make up water?

• Helium and oxygen
• Hydrogen and oxygen
• helium and carbon
• oxygen and carbon

molecule in which opposite ends have opposite electric charges

• cohesion
• polar molecule
• hydrogen bond
• solution

Why does ice float?

• As water freezes, it expands and its density decreases.
• As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
• As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
• As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

Which end of the water molecule has a slightly positive charge?

• the oxygen end
• the hydrogen end
• both ends are slightly positive
• neither end is positive