How To Test For Substances

Question 0

How do you test for a reducing sugar?

Answer 0

Benedictus reagent
Should turn red or brown if present
If not will turn blue

Question 1

How do you test for starch?

Answer 1

Use iodine

If starch is present it will turn blue or black

Question 2

What carbohydrates are reducing sugars?

Answer 2

All monosaccharides and some disaccharides (maltose)

Question 3

What carbohydrates are non-reducing sugars?

Answer 3

Some disaccharides

Question 4

How to test for fats (emulsion test)

Answer 4

Add 2cm3 of sample and 5cm3 of ethanol to a dry great free tube
Shake
Add 5cm3 of water and if fat is present then sample will turn cloudy