Unit One: Plant Oils

Question 1

What do oils and fats contain?

Answer 1

Long chain molecules with lots of carbon atoms

Question 2

What do unsaturated oils contain?

Answer 2

Double bonds between some of the carbon atoms in their carbon chains

Question 3

What do unsaturated oils do to bromine water?

Answer 3

Decolourise it (as the bromine opens up the double bond and joins on)

Question 4

What do monounsaturated fats contain?

Answer 4

One carbon carbon double bond

Question 5

What do polyunsaturated fats contain?

Answer 5

More than one carbon carbon double bond

Question 6

What can be done to unsaturated oils?

Answer 6

They can be hydrogenated- hardened when reacted with hydrogen in the presence of a nickel catalyst at about 60 degrees

Question 7

How does hydrogenation work?

Answer 7

The hydrogen reacts with the double-bonded carbons and opens up the double bonds

Question 8

Why are hydrogenated oils better than unsaturated oils?

Answer 8

They have a higher melting point so they’re more solid at room temperature. This makes them more useful for spreads