Glucose test

Question 1

What are lipids?

Answer 1

These are molecules that contain Carbon, Hydrogen and Oxygen. But they contain a smaller proportion of oxygen than Carbohydrates.

They come in three main types:
Triglycerides
Phospholipids
Steroids

Question 2

What are carbohydrates?

Answer 2

These are molecules that contain carbon, hydrogen and oxygen only.

They come in three main types:
Monosaccharides
Disaccharides
Polysaccharides

Question 3

Step by step how to test for glucose?

Answer 3

Step 1: Place substance in boiling tube
Step 2: Add 1cm³ of Benedict’s Reagent
Step 3: Boil in a water bath for 5 minutes

Positive colour change: Blue to Brick Red

Question 4

What does it mean if solution is blue?

Answer 4

No reducing sugar (0g%)

Question 5

What does it mean if solution turns green?

Answer 5

Traceable amount of reducing sugar (0.5-1g%)

Question 6

What does it mean if solution turns yellow?

Answer 6

Low amount of reducing sugar (1-1.5g%)

Question 7

What does it mean if solution turns orange-red?

Answer 7

Moderate amount of reducing sugar (1.5-2g%)

Question 8

What does it mean if solution turns brick red?

Answer 8

High amount of reducing sugar (>2g%)

Question 9

What are these results known as being?

Answer 9

semi-quantitative.

Question 10

Why is the glucose test known as semi quantitative?

Answer 10

Semi-quantitative examinations are similar to qualitative examinations because testing does not measure the precise quantity of a substance. The difference is that results of these tests are expressed as an estimate of how much of a measured substance is present. This estimate is sometimes reported as a number.

Question 11

Whats the colour change order depending on the amount of glucose in a solution?

Answer 11

Blue-green-yellow-orangered-brickred