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Cata Rela

on 3 April 2017

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Transcript of Water

The properties of water
A liquid at room temperature, water dissolves more subtances than any other liquid.
Living things are typically solid, yet water forms the bulk of their structures.
Water is composed of atoms of the elements hydrogen and oxygen.
Hydrogen bonds
The positively charged hydrogen atoms are ATTRACTED to the negatively charged oxygen atoms of nearby water molecules by forces called HYDROGEN BONDS.
1 atom of O and 2 atoms of H combine by a Covalent Bonding
The water molecule carries an unequal distribution of electrical charge within it.
This unequal distribution of charge is called a DIPOLE.
Molecules which contain groups with dipoles are known as POLAR MOLECULES.
They are weaker than covalent bondss
Benefit to life
Liquid medium for living things and for the chemistry of life
Much heat energy is needed to raise the temperature of water
Aquatic environments are slow to change temperature.
Bulky organisms have stable temperaure
Evaporation requires a great deal of heat.
Evaporation causes marked cooling. Much heat is lost by the evaporation of a small quantity of water
Water molecules adhere to surfaces.
Water column does not break or pull apart under tensio.
Water adheres to the walls of xylem vessels, as it is drawn up the stem to the leaves from the roots.
Water can be lifted by forces applied at the top, and so can be drawn up the xylem vessels of tree trunk by forces generated in the leaves.
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