U2 P7 - fragrances and skincare

Question 1

essential oils uses

Answer 1

perfumes, cosmetic products, cleaning products + flavouring in food

Question 2

steam distillation

Answer 2

essential oils are extracted from plant sources by this process

• steam passes over the plant and extracts the essential oil
• the mixture evaporates and passes into the condenser
• the essential oil collects as a mixture of oil and water, but as the two don’t mix they are easily separated
• the essential oil vapour is chilled and collected

Question 3

components of essential oils

Answer 3

esters, aldehydes, ketones + alcohols and terpenes

Question 4

terpene structure

Answer 4

unsaturated compounds formed by joining together isoprene units

Question 5

isoprene units structural name

Answer 5

2-methylbuta-1,3-diene

Question 6

terpenoid

Answer 6

oxidised terpene

Question 7

free radical reaction

Answer 7

initiation
propagation
termination