- Amphoteric molecules can act both as a base and an acid.
- Amino acids have both acidic (carboxyl) and basic amino groups.
- At high concentrations of hydrogen ions, the negatively charged carboxyl group will accept protons and become uncharged and the overall charge of the amino acids becomes positive.
- At low concentration of hydrogen ions, the positively charged amino group loses its proton and the overall charge of molecule becomes negative.
Amino acids are amphoteric molecules. Explain this statement.
STPM Chemistry Syllabus 3rd Term
Chapter 14: Introduction to
Organic Chemistry
14.1 Bonding of the carbon
atoms: the shapes of ethane, ethane, ethyne and benzene molecules
14.2 General, empirical,
molecular and structural formulae of organic compounds
14.3 Functional groups:
classification and nomenclature
14.4 Isomerism: structural
and stereoisomerism
14.5 Free radicals,
nucleophiles and electrophiles
14.6 Molecular structure and
its effect on physical properties
14.7 Inductive and resonance
effect
Chapter 15: Hydrocarbons
15.1 Alkanes
15.2 Alkenes
15.3 Arenes
Chapter 16: Haloalkanes
Chapter 17: Hydroxy
Compounds
17.1 Introduction to hydroxy
compounds
17.2 Alcohols
17.3 Phenols
Chapter 18: Carbonyl
Compounds
Chapter 19 Carboxylic Acids
and their derivatives
19.1 Carboxylic acid
19.2 Acyl chlorides
19.3 Esters
19.4 Amides
Chapter 20: Amines, Amino
Acids and Proteins
20.1 Amines
20.2 Amino acids
20.3 Proteins
Chapter 21: Polymers