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Questions and Answers
What percentage of water do cells consist of?
What percentage of water do cells consist of?
- 70–95% (correct)
- 30–40%
- 10–20%
- 50–60%
What makes water a solvent?
What makes water a solvent?
- Its lack of cohesion
- Its ability to dissolve many substances (correct)
- Its low boiling point
- Its non-polar nature
What is the term for the attraction between water molecules of the same kind?
What is the term for the attraction between water molecules of the same kind?
- Cohesion (correct)
- Surface tension
- Hydrophobicity
- Adhesion
What property of water allows an insect to walk, stand, or run on its surface?
What property of water allows an insect to walk, stand, or run on its surface?
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What makes water a life-supporting substance?
What makes water a life-supporting substance?
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Study Notes
Water and Its Properties
- Cells consist of approximately 60-70% water.
- Water is a solvent because of its polar nature, allowing it to dissolve a wide variety of substances.
Intermolecular Forces
- The attraction between water molecules of the same kind is known as hydrogen bonding.
Surface Tension
- The surface tension of water, resulting from hydrogen bonding, allows an insect to walk, stand, or run on its surface.
Life-Supporting Properties
- Water is a life-supporting substance due to its unique combination of properties, including its high heat capacity, ability to dissolve nutrients and oxygen, and facilitate chemical reactions.
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