R = Hydrolysis of polymers and reaction of metal salts

Question 1

Define hydrolysis

Answer 1

Hydrolysis = A chemical reaction in which molecules are broken down by reaction with water

Question 2

Hydrolysis of protiens

What does the complete hydrolysis of proteins give you?

Answer 2

Boil with 6M HCl for 24 hours

Amino acids

Question 3

1-Hydrolysis of starch (conditions)

2-What does the complete hydrolysis of starch give you?

3-What does incomplete hydrolysis of starch give you?

Answer 3

1-Heat with dilute HCl

2-Glucose

3-Mixture of different molecules. Maltose (2 glucose units) and maltotriose (3 glucose units) and dextrins (many glucose units)

Question 4

Hydrolysis of fats

What does the complete hydrolysis of fats give you?

Answer 4

Boil with dulite NaOH

Glycerol + sodium salts of the fatty acid

Question 5

How to identify what you have produced after hydrolysis?

Answer 5

Chromatography

Solutions will be colourless.

• Use PENCIL to draw a line across the bottom of the chromatography.
• Place a drop of each solution at the bottom of a piece of chromatography.
• Place a solvent a the bottom of a beaker and place the bottom of the chromatography paper into the solvent. The pencil line and solution must not touch the actual solvent.
• Use pencil to mark where the solvent ends on the paper.
• Net spray it with a locating agent e.g. Minhydrin

Question 6

Define thermal decomposition

Answer 6

The breaking down of a compound in the presence of heat

Question 7

What does it mean when a compound is thermally stable?

Answer 7

It is resistant to thermal decomposition