C1.6 Plant Oils Flashcards

1
Q

Why do vegetable oils make good fuels?

A

Contain a lot of energy

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2
Q

Describe the steps of making oil from seeds

A

-Crushed/pressed -Distilled/decanted/filtered/use a centrifuge

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3
Q

Describe how oil can be obtained by steam distillation

A

-Water and oil are heated till they evaporate -Oil condenses at different temperature to water.

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4
Q

Describe the chemical test for unsaturated oils

A

Add bromine water Turns from orange to colourless if oil is unsaturated

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5
Q

Why are oils more suitable for cooking than water

A

Higher boiling point Cooks food faster (Tastes nicer)

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6
Q

What are the conditions needed to hydrogenate an unsaturated oil

A

60oC Nickel Catalyst

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7
Q

How does hydrogenating vegetable oils change their properties?

A

Raises the boiling point Making it solid

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8
Q

Describe how an emulsifier works

A
  • Hydrophilic head is attracted to water
  • Hydrophobic tail is attracted to oil
  • Oil droplets repel
  • Creating suspension of oil throughout the water
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9
Q

Describe the risks of eating too much animal fats

A

High cholesterol

Causes heart disease

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