REQUIRED PRACTICAL: FOOD TESTS Flashcards
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
