Water and the Chemistry of Life
Why Water Is Special
Water Molecules
A water molecule contains one oxygen atom and two hydrogen atoms. Its shape and polarity give it unusual properties that are essential for life.
Hydrogen Bonding
Hydrogen bonding is a relatively strong intermolecular attraction that occurs when hydrogen is involved in a polar interaction. In water, it helps explain cohesion, surface tension, and high boiling point.
Water Properties
Life Depends on Water
Cells, enzymes, and transport systems all rely on water's chemical behavior.
Why is water a good solvent for many substances?
Water's polarity helps it interact with and dissolve many substances.
Correct answer: It is polar
What term describes water molecules sticking to each other?
Cohesion is attraction between similar molecules, such as water molecules.
Correct answer: cohesion
What is the main structural reason water behaves unusually?
Water's bent shape and polarity drive many of its properties.
Correct answer: Its shape and polarity
How Water Supports Life
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Water molecules are polar.
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Polar molecules attract each other and other polar substances.
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3
These attractions affect dissolving, movement, and temperature control.
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Living systems use these properties for chemistry and transport.
What kind of molecule is water: polar or nonpolar?
Water is polar because charge is distributed unevenly across the molecule.
Correct answer: polar