B1 Core concepts Flashcards
1
Q
Test for starch
A
- Iodine
- Goes from orange to blue black
2
Q
Test for sugar
A
- Benedicts solution
- Heat
- Blue > Brick red
3
Q
Test for protein
A
- Biuret
- Sodium hydroxide + Copper sulphate
- Blue > Purple
4
Q
Test for fat
A
- Ethanol emulsion
- add ethanol, food, water
- shake
- White precipitate forms
5
Q
How does a calorimeter work
A
- Food is burned
- Heats water
- Calculate temperature change of water
- use that to calculate energy of the food
6
Q
Why does a calorimeter have a lid
A
- Insulator
- So energy from food is being used to heat water
