2.8 fragrances

Question 1

What are essential oils?

Answer 1

concentrated extracts of the volatile, non-water soluble aroma compounds from plants
they are mixtures of many different organic compounds

Question 2

give 4 uses of essential oils

Answer 2

• perfumes
• cosmetic products
• cleaning products
• flavouring in foods

Question 3

What are terpenes?

Answer 3

key components in most essential oils

they are unsaturated compounds formed by joining together of isoprene units

Question 4

What is the systematic name for isoprene?

Answer 4

2-methylbuta-1,3-diene

Question 5

What happens when you oxidise a terpene?

Answer 5

produce some of the compounds responsible for the distinctive aromas of spices derived from plants

Question 6

How can the number of isoprene units in a terpene be identified?

Answer 6

divide the number of carbon atoms in the terpene by 5

Question 7

What does volatile mean?

Answer 7

how easily a substance will evaporate

Question 8

Name the molecule in which terpenes are based

Answer 8

isoprene

-C5H8

Question 9

What is the general formula for a terpene?

Answer 9

(C5H8)n

Question 10

What is a terpenoid?

Answer 10

oxygenated terpene