REQUIRED PRACTICAL: FOOD TESTS Flashcards Preview

PAPER 1 : BIOLOGY > REQUIRED PRACTICAL: FOOD TESTS > Flashcards

Flashcards in REQUIRED PRACTICAL: FOOD TESTS Deck (13)
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1
Q

Why do we mix the crushed food

with water and then filter the mixture?

A
  • separate the molecules into the water to make it easier to see the colour change
2
Q

What is the chemical test for sugars?

A
  • benedict solution

- heated in hot water

3
Q

What would you see if sugar was present?

A
  • blue to brick red (green, yellow then brick-red)
4
Q

What would you see if sugar was absent?

A
  • stays blue
5
Q

What is the chemical test for starch?

A
  • iodine
6
Q

What would you see if starch was present?

A
  • iodine turns from orange to blue- black
7
Q

What would you see if starch was absent?

A
  • stays orange
8
Q

What is the chemical test for protein?

A
  • biuret reagent
9
Q

What would you see if protein was present?

A
  • turns from blue to purple
10
Q

What would you see if protein was absent?

A
  • stays blue
11
Q

How do we test for fats?

A
  • add ethanol and shake it
12
Q

What would you see if fats was present?

A
  • turns cloudy-white
13
Q

What would you see if fats was absent?

A
  • stays clear