Biological importance of water
- Created by: lou2
- Created on: 01-11-16 13:42
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- Water
- Composition of blood
- 55% plasma
- 45% cells
- Polar covalent molecules
- A covalent molecule has a SLIGHT negative and positive charge on opposite ends
- positive + negative= ATTRACTION
- Forms HYDROGEN bonds
- Weak, polar covalent molecules
- Form RAPIDLY and break RAPIDLY
- Forms HYDROGEN bonds
- Cohesion
- Molecules of the SAME substance are attracted to each other
- Leads to surface tension and water droplets
- Surface tension
- A measure of the amount of force needed to stretch or break the surface of a liquid
- Water- GREATER surface tension due to hydrogen bonds on surface
- Surface tension
- Leads to surface tension and water droplets
- Molecules of the SAME substance are attracted to each other
- Adhesion
- Attraction between molecules of DIFFERENT substances
- Specific heat
- High- takes alot of energy to break the hydrogen bonds
- Enables living organisms to better resist rapid changes in body temp
- Ice
- LESS dense then liquid water
- Due to HYDROGEN bonds
- Acts as insulating layer and lets life live underneath
- LESS dense then liquid water
- Definitions
- Solution- a homogenous mixture of two or more substances
- Solvent- substance that dissolves another
- Solute- substance that is dissolved
- Composition of blood
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