Water
- Created by: EmilyStudley
- Created on: 14-09-15 17:11
View mindmap
- Polar Molecule
- one end of the molecule is slightly positively charged and the other is slightly negatively charged.
- In water, the hydrogen atom = slight positive charge and the oxygen atom = slight negative charge.
- Because - oxygen atom takes more than its share of the electrons
- In water, the hydrogen atom = slight positive charge and the oxygen atom = slight negative charge.
- Water
- As a Solvent
- Good solvent for ionic and other polar compounds
- Thermal properties
- High specific heat capacity
- A lot of HEAT ENERGY is needed to cause a small temperature rise = more energy therefore more kinetic movement.
- temperature of organisms remains constant
- Constant enviromental temperature to aquatic organisms.
- A lot of HEAT ENERGY is needed to cause a small temperature rise = more energy therefore more kinetic movement.
- Density of water = 4 (degrees Celsius)
- = ice is less dense than water = floats on surface.
- Ice insulates the water beneath = preventing from freezing right through = organisms can survive.
- High specific heat capacity
- provides support and buoyancy
- Denser than air = supports organisms as large as whales. Supports and disperses reproductive structures e.g. larvae and large fruits.
- Transparent to light = aquatic plants can photosynthesis
- Molecules can slide over each other (low viscosity) - can flow easily through narrow capillaries.
- As a Solvent
- one end of the molecule is slightly positively charged and the other is slightly negatively charged.
- Hydrogen Bonds
- Occurs between the slightly positively charged hydrogen atoms in one molecule and the slightly negatively charged oxygen atom in another.
- Water
- As a Solvent
- Good solvent for ionic and other polar compounds
- Thermal properties
- High specific heat capacity
- A lot of HEAT ENERGY is needed to cause a small temperature rise = more energy therefore more kinetic movement.
- temperature of organisms remains constant
- Constant enviromental temperature to aquatic organisms.
- A lot of HEAT ENERGY is needed to cause a small temperature rise = more energy therefore more kinetic movement.
- Density of water = 4 (degrees Celsius)
- = ice is less dense than water = floats on surface.
- Ice insulates the water beneath = preventing from freezing right through = organisms can survive.
- High specific heat capacity
- provides support and buoyancy
- Denser than air = supports organisms as large as whales. Supports and disperses reproductive structures e.g. larvae and large fruits.
- Transparent to light = aquatic plants can photosynthesis
- Molecules can slide over each other (low viscosity) - can flow easily through narrow capillaries.
- As a Solvent
- Due to the bonds, water has unique properties = biologically important.
- cohesion
- wherever water meets air = it behaves like an elastic 'skin'.
- Pond skaters: walk on the surface of the water
- Mosquito larva: hang from the surface in order to breathe
- Why?
- chemical reactions take place in solutions
- Used for transport e.g. oxygen in the blood in animals, sugar through phloem tubes in plants
- High latent heat of vapouisation
- More energy is required to separate the bonds = sweating is a good method of cooling mammals + Transpiration helps to cool green plants.
- As a Metabolite
- Takes part in chemical reactions that take place in living things. Water takes part in reactions such as photosynthesis and hydrolysis.
Comments
No comments have yet been made