Unit 4.7 Amino Acids Flashcards
WELCOME
get out
Define amphoteric
Can react both as base and acid
Define zwitterion
(3 things)
- Dipolar ion
- Both positive & negative charge
- Resulting in neutral molecule
How can u tell it’s an α-amino acid?
(3 things)
- H2N on the left
- COOH on the right
- Quite obscure…
What classifies an α-amino acid?
(3-way)
- It’s on the α-carbon
- to the carboxylic acid
What is the general formula for an α-amino acid?
CHR(NH2)COOH
Draw displayed formula of general formula for an α-amino acid
(Whiteboard)
Lol
What is the simplest amino acid?
(2-tings)
- Glycine
- R group is just H
Draw structural formula of glycine “3D”
(Whiteboard
Stage is urs per se?
How does the presence of an amine group allow amino acids to also act as a base?
(2-way)
- Lone pair on nitrogen can act as a base
- Accepting a proton/donating an electron pair
What allows the amino acid to be amphoteric?
- Base (Nitrogen lone pair)
- Acid (Carboxylic acid prob)
Show with a diagram, the amphoteric behaviour glycine
State what the result is?
Alas, the zwitterion
Draw the zwitterion version of alanine (R=CH3)
(Whiteboard)
(Just use that as foundation incase of other “zwitterions”)
The stage is always urs
Explain whether m.p of amino acid is high or low?
(3 things)
- Much higher up
- Can form ionic bonds with neighboring ions
- Due to charge
How are amino acids also soluble in water?
(3t hings)
- Can do hydrogen ponds
- They’re polar molecules
- Dissolves within water
