food test

Question 1

iodine

Answer 1

starch

orange -> blue/black

method: 2 drops

Question 2

benedict’s (the long one)

Answer 2

reducing sugars

blue -> red

method:
equal volume with what you are testing
leave for 5 mins
70°C+

Question 3

biuret reagent

Answer 3

proteins

colourless -> purple/lilac

method: 3/4 drops

Question 4

ethanol / sudan 3

Answer 4

fats

colourless -> milky white precipitate

SUDAN 3 colourless -> orange

method:
mix with water
with with ethanol