Lesson 2 - Food Tests

Question 1

What is the test name for starch

Answer 1

Iodine test

Question 2

Method for starch

Answer 2

Add drops of iodine to solid or liquid placed in a spotting tile

Question 3

Starch positive result

Answer 3

Yellow/brown to blue/black

Question 4

Test name for sugar

Answer 4

Benedict’s test

Question 5

Method for sugar

Answer 5

Crush food with water in a pestle and mortar
Add extract to a boiling tube
Add 2cm3 of Benedict’s reagent
Place in a hot water bath for 2-3 minutes

Question 6

Sugar colour change

Answer 6

Blue - green - brick red

Question 7

Protein test name

Answer 7

Biuret test

Question 8

Protein method

Answer 8

Crush food with water in a pestle and mortar
Add to a boiling tube
Add 1cm3 of sodium hydroxide and copper sulfate
Shake gently

Question 9

Test name for fat

Answer 9

Emulsion test

Question 10

Fat method

Answer 10

Crush food with ethanol in pestle and mortar
Add extract to a boiling tube
Half full a second boiling tube with cold water
Pore extra t into boiling tube containing cold water

Question 11

Fat colour change

Answer 11

White emulsion will form at top of boiling tube Half full- containing cold water