10asc1 Hydrogenation of oils

1
10asc1 Hydrogenation of oils
2
WALT What is hydrogenation?

• WILF
• All are able to state one difference between
  frying and boiling food (grade D)
• Most are able to describe how liquid oils can be
  hardened by hydrogenation (grade C)
• Some are able to explain the effect of
  hydrogenation on an unsaturated molecule (grade
  B)

3
Starter to review prior learning

• Copy and complete using the words below
• emulsifier emulsion ice cream mayonnaise mix
  separating small
• Oil and water do not ___ together, but if the oil
  droplets can be made very _____ it is possible to
  produce a mixture of oil and water called an
  ______. To keep the oil and water from ________
  we can use a chemical called an _______.
  Important examples of food made like this include
  _______ and __ _____ .

4
Why do we cook food in oils?

• Task
• Fry some small potato pieces in oil
• 2. Observe the texture and appearance of the
  fried potato.
• 3. How does this compare to boiled potato?
• 4. Can you explain why there is a difference?

5
How do they make olive oil into a spread?

• Double bonds stop the molecules fitting together
  very well.
• If hydrogen is added some of the double bonds
  become single bonds.
• A temperature of 60c and a nickel catalyst is
  needed.
• The molecules fit together better.

6

• The size of the forces between the molecules
  increases.
• This raises the melting point.
• Thus the oil becomes a solid at room temperature.
• This is called hardening.
• The solid oil is called a hydrogenated oil.

7
Answer this question with a partner

• Is the hardened oil as good for you as the
  liquid oil?
• Justify your answer

8
Copy and complete the following using the words
below

• energy hardening higher hydrogen melting
  tastes
• The boiling points of vegetable oils are ____
  than the boiling point of water.
• This means that food cooked in oil ______
  different to boiled food. It also contains more
  ______.
• The boiling and _______ points of oil may be
  raised by adding ______ to their molecules. We
  call this _________ the oil.

9
WALT What is hydrogenation?

• WILF
• All are able to state one difference between
  frying and boiling food (grade D)
• Most are able to describe how liquid oils can be
  hardened by hydrogenation (grade C)
• Some are able to explain the effect of
  hydrogenation on an unsaturated molecule (grade
  B)

10
How well have you worked today?

• Turn to the back of your books and write down one
  thing you have done well in this lesson and one
  thing you could do better.
• Examples
• I worked well with my partner
• I need to ask my teacher to explain further.
• I solved a problem
• I answered a question in class
• I really understand this work.
• I used a key word correctly in a sentence