UNIT 2- FRAGRANCES

Question 1

what are essential oils?

mention the key compound too

Answer 1

• concentrated extracts of VOLITILE, NON-WATER SOLUBLE, aroma compounds that are natrually made
• terpenes are the key compounds in most essential oils

Question 2

what are some uses of essential oils?

Answer 2

1. cosmetics
2. cleaning
3. medicine
4. flavours

Question 3

name 2 properties of essential oils

mention why they have these properties

Answer 3

volitile- only weak LDFs between the molecules
insoluble in water- because they are non-polar

Question 4

name a method to extract essential oils.

and the 4 steps to complete this mention the definition of condenser

Answer 4

STREAM DISTILATION
1. water is boiled under a mass of dried plant leaves
2. stream passes through leaves, essential oils vapourise to a gas and are carried with
3. condenser=> area of cold temperature which turns gas to liquid.
4. can be collected

Question 5

terpenes

what are they? structual name? where are they found?

Answer 5

• natrual organic compounds
• 2methylbutyl1,3diene
• also known as isoprenes
• C5H8
• in essential oils

Question 6

when a terpene is oxidised what is it called?

Answer 6

terpenoid

Question 7

name an alternative way of extractingessential oils?

Answer 7

solvent distillation

Question 8

how do isoprene molecules join together?

Answer 8

oxidation reactions

Question 9

why do some chemicals have a fragrance?

Answer 9

• non-polar
• most volatile
• LDFs

Question 10

why do some fragrances have no fragrance?

Answer 10

• hydrogen bonding
• polar
• soluble in water or other polar liquids
• also pdp-pdp
• least volatile