Stwff

Question 1

Glucose + Benedict’s test

Answer 1

brick red

Question 2

Sucrose + Benedict’s test

Answer 2

blue

Question 3

Glucose + iodine

Answer 3

Orange-brown

Question 4

Starch + iodine

Answer 4

Blue-black

Question 5

Test for protein

Answer 5

• add a few drops of sodium hydroxide and copper(ll) sulphate
• these react to make blue copper hydroxide.
• if a protein is present, the copper hydroxide interacts with the peptide bond in the protein to make buiret
• colour change from blue to purple