3.1.3 Lipids

Question 1

Draw out the structure of a lipid

Answer 1

Check it online

Question 2

What happens when you mix lipids with water

Answer 2

They are in insoluble in water
Lipids are nonpolar .
They are hydrophobic

Question 3

What is the carbon area of the lipid called

Answer 3

A triglyceride

Question 4

What is the effect of double bonds in a fatty acid chain

Answer 4

Takes up more space so less effect from London forces
Therefore this reduces melting point

Question 5

What are the different types of fatty acids and give a breaf description of each

Answer 5

Saturated - has no double bonds , has max hydrogens bonded

Monounsaturated- has only one double bond.

Polyunsaturated- has more than one double bond

Omega 3/6 - double bonds start after the 3/6 carbon

Question 6

Forming a ester bond is called

Answer 6

Esterification

Question 7

What type of reaction is esterification

Answer 7

A condensation reaction

Question 8

Name three features of saturated lipids

Answer 8

Has single bonds between carbons and is fully saturated with hydrogens

Strong attraction between chains

Closely packed so has high boiling and melting temperature

Question 9

name three features about unsaturated lipids

Answer 9

Has double bonds and are unsaturated

Link does not allow for optimal storage therefor has low melting and boiling point

Kinks mean that they have low attraction between chains

Question 10

Describe lipids role in water proofing

Answer 10

Hydrophobic so repels water and can act as a barrier e.g cutical in plants upper epidermis

Question 11

Describe lipids role in thermal insulation

Answer 11

Provide thermal insulation from the extra layers

Question 12

Describe lipids roles in protection

Answer 12

Reduces blunt force by spreading the impact across the adipose tissue reducing damage to organs

Question 13

Describe a test for lipids

Answer 13

1. Mix test substance to ethanol
   2.shake
   3.add water
   4.milky colour indicates lipids