Food Tests

Question 1

Bendedict’s test is the test for what?

Answer 1

Sugar

Question 2

What is colour of the chemical at the start of the Biuret test?

Answer 2

(Pale) Blue

Question 3

What is the Iodine test used for?

Answer 3

To find the presence of Starch in food

Question 4

Which test has a positive result colour of brick red?

Answer 4

Benedict’s

Question 5

Does the Biuret test require heat?

Answer 5

No

Question 7

• Cut food into very small pieces
• Place in a boiling tube
• Add 3cm/3 Ethanol
• Shake and let settle
• 1/2 fill and 2nd test tube with water
• Add drops of Solution 1 to the water

What test is this?

Answer 7

The Emulsion test

Question 8

Violet is the positive result of what test?

Answer 8

Biuret

Question 9

How do you carry out the iodine test?

Answer 9

Add several drops of iodine to a solid food or liquid

Question 10

Copper sulphate is used in what test?

Answer 10

Biuret

Question 12

Which test requires heat to carry out?

Answer 12

Benedict’s

Question 13

What is the alternative test for fat?

Answer 13

The paper spot test

Question 14

What is the colour change for the iodine test if the result is positive?

Answer 14

yellow/orange to blue/black

Question 16

• Dissolve food in ____ using pestle and mortar
• Add to _______
• Add ____ of _________ solution
• _______ in a _________ for ___ to ___ minutes

This is the method for the Benedict’s test, fill in the blanks

Answer 16

Water, Boiling tube, 2cm/3, Benedict’s, Place, Water bath, 2, 3

Question 17

What is the positive result of the Emulsion test

Answer 17

Water will become cloudy

Question 18

What are the steps for the test for protein?

Answer 18

• Dissolve food in 1cm of water using pestle and mortar
• Add to boiling tube
• Add 1cm/3 of dilute sodium hydroxide
• Add 3 drops of copper sulphate
• Shake and watch