Water
- Created by: katieshrmn
- Created on: 15-03-15 16:55
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- Water
- Hydrogens attached to Oxygens
- Covalent Bonds
- Oxygen is more electro - negative than Hydrogen so electrons aren't shared equally
- Hydrogen has a partially positive charge because electrons are pulled toward Oxygen
- Diplole (uneven distribution of charge)
- Any molecule that has a dipole is polar
- Hydrophillic molecules attracted to charged parts of water because they're charged/polar
- Hydrophobic Molecules don't mix with water .. no charge to attract water
- Sometimes beneficial because when they're surrounded by water they will be pushed together creating stability in their structure. e.g. cell membranes
- Solvent (polar/charged molecules dissolve in it)
- Water molecules surround ion..
- Seperating and breaking up the solid... it can now move and particles react as they can collide
- Essentials dissolve in blood to be transported (glucose)
- Digestive enzymes dissolve in water so they can collide with food
- In the secretory system, urea is dissolved in water to allow us to remove it
- Mucin in muceus dissolves in water to create a lubricant
- Water molecules surround ion..
- Hydrogen bonds inbetween water molecules
- Hard to break
- High boiling point
- Liquid at earth temp
- Suitable transport medium and for organisms to live
- High specific heat capacity so it stays a stable temp
- Needs to absorb/lose heat to change temp
- Used as a coolant.. removes excess heat from the body
- Provides us with a stable body temperature and organisms living in water plus a stable habitat temperature
- Needs to absorb/lose heat to change temp
- High specific heat capacity so it stays a stable temp
- Suitable transport medium and for organisms to live
- Liquid at earth temp
- High boiling point
- Hard to break
- Ice is less dense than water
- Expands when cooled and freezes
- Hydrogen bonds hold the water molecules apart at a distance
- Useful for organisms living under ice as it insulates the water so they can survive
- Changes in density causes currents in oceans which is important for circulating nutrients around oceans
- Expands when cooled and freezes
- Cohesion is where water molecues stick together as a result of hydrogen bonds between them
- Xylem relies on cohesion to move water through the plant
- Creates surface tension on water which can act as a habitat
- Takes a big force to compress water molecules due to the hydrogen bonds keeping them apart
- Water can take a a big force
- Organisms living in it it are supported
- Amniotic fluid in womb acts as a shock absorber
- Large organisms can live in water
- Plants use water for support (turgor)
- Water can take a a big force
- Hydrogens attached to Oxygens
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