b3

Question 1

What is solution is used to test for starch?

Answer 1

iodine tests for starch

if present: yellow/red iodine solution turns blue/black

Question 2

What does benedicts solution test for?

and what is the positive test?

Answer 2

Tests for sugars
If positive (sugar present) then the blue benedicts solution turns brick red when heated

Question 3

Test for protein?

Answer 3

Biuret test - 
If positive (protein present) then Blue Biuret reagent turns purple

Question 4

What is used to test for Lipids?

Answer 4

Ethanol test 
If positive (present for lipids) then ethanol forms a cloudy white layer

Question 5

Why should we be careful when testing for Lipids?

Answer 5

As ethanol test is highly flammable and harmful

Question 6

Why should we be careful when testing for Proteins? and what equipment should be used for it?

Answer 6

As the Biuret test is corrosive

[So wear goggles to prevent chemical splashing into the eyes]