Properties of Water
Water molecule consists of one oxygen atom
and two hydrogen atoms. Since two pairs of electrons are unshared, there are
two lone pairs surrounding the oxygen atom in the center. One water molecule
can bond with four others because each hydrogen bonds with another oxygen atom
and the oxygen can bond with two hydrogen atoms. These bonds are called
hydrogen bonds.
Properties
Ability to moderate temperature—The
temperature of water rises and water can evaporate due to increase in molecular
motion. When the water mixes with air, the water cools off the air and thus the
temperature of air will decrease. When the land is colder, the water molecules
that evaporate from the ocean have more molecular motion and thus increase the
temperature of air.
Cohesion and Adhesion
Cohesion: Similar molecules can stick with
each other due to mutual attraction.
Adhesion: Different molecules or surfaces
can stick with each other.
Water in plants
Due to adhesion, water in the roots adheres
to the inner tube. Due to cohesion, the water molecules stick together and go
up against the force of gravity from the roots to the leaves.
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