Lecture 6-water- From Hydrogen Bonds to Biology

Importance of Water for life

composes 70-72% of the human body

Why is Water a polar molecule

water has a partial positive charge on hydrogen atoms and the oxygen has a partial negative charge

What substance is versatile solvent

Water

Solvent 

a substance for another substance to dissolve in

Solute

the substance being dissolved 

Hydrophilic

• polar molecule s

• sugars,salts

• dissolve in water 

Hydrophobic

• non-polar

• oils fats

• do not dissolve and instead aggregate

PH

measuring acidity or basicity of a solution

normal phyiosoal ph range

(7.35-7.45)

Why is ph Important

• hydroxide ion are reactive changes in ph can

• alter 

• protein function

• disrupt cellular process

• affect organism health 

liquid water

• most biologically useful form of water

• hydrogen bonds allowing to flow act as a solvent 

Nonpolar

• molecule that lacks a charge or partial charge

Polar Molecule

A molecule uneven charge distribution

Solubility

a solvent as how (NaCI) dissovles in another ( the solvent

Density

water is denser as a liquid as solid ice

Hydrogen bond 

a weak bond between a partial positive hydrogen bond and slightly partially negative oxygen atom