Unit 3 Quiz 2

A map of eastern North America, showing the pH of rainfall in the various states, indicates that the pH of rain in New York State varies from 5.5 to 6.40. According to these figures, the most acidic rainfall in New York State has a pH of

• 5.5
• 6.0
• 6.2
• 6.40

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

• All increase when temperature increases.
• All are produced by ionic bonding.
• All are properties related to hydrogen bonding.
• All have to do with nonpolar covalent bonds.

Why does ice float in liquid water? 

• The liquid water molecules have more kinetic energy and thus support the ice.
• The ionic bonds between the molecules in ice prevent the ice from sinking.
• Ice always has air bubbles that keep it afloat.
• Hydrogen bonds stabilize and keep the molecules of ice farther apart than the water molecules of liquid water.

The property of water whereby molecules tend to stick to one another is called: 

• cohesion
• polarity
• adhesion
• viscosity

The property of water whereby molecules tend to stick to objects is called: 

• cohesion
• surface tension
• adhesion
• viscosity

The unique attractive forces that keep molecules of water together are called: 

• adhesion
• hydrogen bonds
• cohesion
• strong forces

Oil and water never mix because 

• oil is polar and water is nonpolar
• oil has too many hydrogen bonds for water to dissolve it
• water is polar and oil is nonpolar
• water is amphipathic

Surfactants such as detergent and soap work because they are 

• adhesive
• cohesive
• amphipathic
• hydrophilic only

An ecosystem could not survive without this form of energy.

• Electrical Energy
• Sound Energy
• Mechanical Energy
• Light Energy