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Cooking - PowerPoint PPT Presentation


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Cooking. Cooking. Most food has to be cooked before it is eaten. Which foods can be eaten raw?. Why does food have to be cooked?. Have a think. Write down your ideas in the form of a spidergram. to kill microbes. to improve the texture. to improve the taste.

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PowerPoint Slideshow about ' Cooking' - jody


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Presentation Transcript
slide2

Cooking

Most food has to be cooked before it is eaten.

Which foods can be eaten raw?

slide3

Why does food have to be cooked?

Have a think.

Write down your ideas in the form of a spidergram.

slide4

to kill microbes

to improve the texture

to improve the taste

Why does food have to be cooked?

to make it easier to digest

to improve the flavour

slide5

How can food be cooked?

Do you recognise these different ways of cooking?

In each case write down the name of the method.

slide6

The food is cooked using electromagnetic radiation with a wavelength of about 1cm.

microwave cooker

slide12

Cooking is a chemical change

  • This means...
  • a new substance is made
  • it cannot be reversed
  • an energy change takes place
slide14

Potatoes are a good source of ___________

carbohydrate

When heated, the cell walls of the potato cells break down. This makes the potato softer. Enzymes can now get to the starch inside the cell, so the potato is easier to digest.

slide16

Eggs (and meat) are good sources of _______.

protein

When heated, the molecules in protein change shape. We say the protein has been denatured.

slide17

Baking powder

  • Baking powder is used

in making cakes.

  • It contains sodium

hydrogencarbonate.

  • This breaks down (decomposes) when heated and makes carbon dioxide.
  • Carbon dioxide makes the cake rise.
slide18

Baking powder

This is a chemical change. The word equation is:

sodium

hydrogen

carbonate

sodium carbonate

carbon dioxide

+

+

water

The test for carbon dioxide:

Carbon dioxide turns _____ water ______.

lime

cloudy

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