Microbiology

Learn the toughest concepts covered in Microbiology with step-by-step video tutorials and practice problems by world-class tutors.

4. Water

Properties of Water- Cohesion and Adhesion

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Properties of Water- Cohesion and Adhesion

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Properties of Water- Cohesion and Adhesion Example 1

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Problem

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

a) Lakes cannot freeze solid in winter even with extremely low temperatures.

b) A spider can walk across the surface of a small pond.

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

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

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Problem

Cohesive forces in liquid water occur when:

a) The H atoms on molecules of H2O hydrogen bond to O atoms on adjacent molecules of H2O.

b) The H atoms on molecules of H2O hydrogen bond to other H atoms on adjacent molecules of H2O.

c) The atoms on molecules of H2O hydrogen bond to other O atoms on adjacent molecules of H2O.

d) None of the above are correct.