Water Flashcards
A water molecules is ___
dipolar
What is a water molecule made up of?
2 hydrogen
1 oxygen
How can a water molecule be dipolar?
No overall charge
yet O = slightly - H= slightly +
it has both positive and negative poles
so it is dipolar
Name bond between water molecules
Hydrogen
Why is the specific heat capacity of water significant?
water molecules stick together which is unusual -> more energy needed, SHC higher than expected
SO
waters acts as a buffer against sudden temperature changes = temperature stable aquatic environment
Describe the latent heat of vaporisation of water
H-bond = a lot of energy needed to evaporate 1kg of a water
very effective method of cooling
Water is where ______
life arose
Describe cohesion and surface tension in water
water surface = skin and strong enough to support small organisms
Large cohesive forces= pulled through tube
in contact with air water molecule is pulled back into body of water not escaping
Define cohesion
tendency of alike molecules to stick together
Define adhesion
tendency on unalike molecule to stick together
Describe the role of water in Metabolism
water is used up in Hydrolysis / produced in condensation
chemical reaction occur in aq mediums
major raw material in photosythesis
Describe water as a solvent
water readily dissolves other substances eg gas ( co2 o2) waste ( NH3 urea ) inorganic ions / small hydrophobic molecules enzymes ( reaction in solution )
Random 3 features of water
evaporation cools organism so they can control their temperature
not easily compressed provides support eg hydrostatic skeleton
transparent aquatic plants can photosynthesize
Name the 8 important features of water
Specific heat capacity Latent heat of evaporation Cohesion and surface tension metabolism solvent evaporation not easily compressed transparent
Where are inorganic ions found ?
in solution in the cytoplasm
body fluids
part of larger molecules
