Water, pH and Amino Acids

Question 1

What type of bonding does water have?

Answer 1

• Polar

- Hydrogen bonding (D-P-D)

Question 2

What shape is a Water Molecule?

Answer 2

-Bent

Question 3

What substances can dissolve in water?

Answer 3

• Polar and ionic-Hydrophilic

- ‘like dissolves in like’

Question 4

What are Amphipathic Molecules?

Answer 4

BOTH-Polar (Hydrophilic) head and Non-Polar (Hydrophobic) tail

Question 5

What are Precursors?

Answer 5

Compound in a reaction produces another compound.

Question 6

What do amino acids form?

Answer 6

When joined together by peptide bonds form proteins

Question 7

What are the two functional groups in an Amino Acids?

Answer 7

Carboxyl

Amine

Question 8

What makes amino acids different?

Answer 8

R side chain attached

Question 9

What are the X4 Types of Amino Acids and their R side chains?

Answer 9

1) Basic- Amine Group (NH2)
2) Acidic- Carboxyl group (COOH)
3) Polar-Hydroxyl Group (OH)
4) Hydrophobic-Hydrocarbon.

Question 10

What type of reaction forms a protein from amino acids?

Answer 10

• condensation

- Water side product

Question 11

What are Acids and Bases?

Answer 11

Acids- Donates protons ‘a’-away

Bases- Protein acceptor

Question 12

What is the Acid Dissociation Constant? Ka

Answer 12

-Strength of Acid in a solution

Question 13

What is pH a measure of?

Answer 13

-Measure of hydronium/hydrogen ions

Question 14

What happens to the proton concentration when pH changes by 1?

Answer 14

Tenfold change in proton concentration

Question 15

What is a Base?

Answer 15

A soluble alkali

Question 16

What are buffer solutions?

Answer 16

Maintain pH when small amounts of acid and alkali are added

Question 17

What is a Zwitterion?

Answer 17

• An amino acid with no charged R Side group

- Neutral can act as buffer

Question 18

What happens to buffers when acids and alkalis are added?

Answer 18

• Acid added- Cationic form (H+ Ions)

- Alkali Added- Anionic Added (OH-)