3.1.3 Lipids

Question 1

Describe how a triglyceride is formed

Answer 1

One glycerol and three fatty acids
Condensation reactions and removal of three molecules of water
Ester bonds formed

Question 2

Describe how you would test a liquid sample for the presence of lipid and how would you recognise a positive test

Answer 2

Mix / shake sample with ethanol
Decant into then water
White / milky emulsion