GCSE Food tests

What chemical is used to test for starch?

• Benedicts

• Biuret

• Ethanol

• Iodine

What chemical is used to test for sugar?

• Benedicts

• Biuret

• Ethanol

• Iodine

What chemical is used to test for lipids?

• Benedicts

• Biuret

• Ethanol

• Iodine

What chemical is used to test for protein?

• Benedicts

• Biuret

• Ethanol

• Iodine

What does a positive result look like for the starch test?

• Turns purple

• Turns blue-black

• Form a layer

• Turns yellow, orange or brick red

What does a positive result look like for the lipids test?

• Turns purple

• Turns blue-black

• Form a layer

• Turns yellow, orange or brick red

What does a positive result look like for the protein test?

• Turns purple

• Turns blue-black

• Form a layer

• Turns yellow, orange or brick red

What does a positive result look like for the sugar test?

• Turns purple

• Turns blue-black

• Form a layer

• Turns yellow, orange or brick red

During which test does the sample need heating to a temperature above 60 degrees Celsius?

• Starch

• Sugar

• Lipids

• Protein

What needs to happen before any chemicals are added? Tick two boxes.

• Food needs crushing with pestle and mortar

• Desk needs cleaning

• Boiling tubes need washing

• Distilled water is added