Molecules
covalently bonded
Compound
Different elements
Methyl group
–CH3
Amine group
–H2N
Carboxyl group
–COOH
radicals
Polar vs non-Polar
polar = hydrophilic
non-polar = hydrophobic
pH
the negative logarithm of the molar concentration of protons
(1 =Acidic …….. 14 =Alkaline)