Biology - Biological molecules: Water

These are complete notes copied out of my textbook completed for homework, on the biological molecule Water. Diagrams included. It is based on the OCR specification for AS Biology. Happy revising! =P

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Reianna Shakil L6EFBiology14/10/12




Biological molecules ­ Water
The human body is made up of 60% water, which had small molecules made of two
atoms of hydrogen combined with one atom of water, formula H2O.
Water is by far the most abundant molecule in our bodies; it is also one of…

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Reianna Shakil L6EFBiology14/10/12



If you heat water, the temperature of the water rises. Temperature relates to the
amount of kinetic energy that the water molecules have.

As heat energy is added to the water, a lot of the energy is used to break the hydrogen
bonds between the water molecules.…

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Reianna Shakil L6EFBiology14/10/12



Solvent properties

Water is an excellent solvent. The tiny charges on its molecules attract other molecules
or ions that have charges on them.
The molecules and ions spread around in between the water molecule. This is called
dissolving.
When an ionic compound such as sodium chloride dissolves…

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Reianna Shakil L6EFBiology14/10/12


Density and viscosity

Water molecules are pulled closely together by the hydrogen bonds between them, and
this makes water a relatively dense liquid. The density of pure water is 1.0g cm -3. Ethanol
has a density of only 0.79g cm-3.

Most living organisms, containing a lot of…

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