2.2.1- Water


Functions of Water:

·         reactant in chemical reaction e.g. hydrolysis

·         solvent- substances dissolve in it so reactions can take place e.g. in the cytoplasm of eukaryotic and prokaryotic cells

·         transports substances e.g. glucose and oxygen around organelles

·         temperature control due to the high specific heat capacity and high latent heat of evaporation

·         habitat- temp control, solvent, less dense when freezes = organisms can survive and reproduce in it.


Structure of Water:

Polarity of Water- hydrogen is slightly +ve and Oxygen is slightly -ve 

hydrogen bonding- the slightly -ve oxygen attracts the slightly +ve hydrogen atoms of other molecules.


Properties of Water:

High specific heat capacity- the hydrogen bonds give water its high spec. heat cap. - the energy needed to raise 1 gram of a substance by


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