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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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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

Why does food have to be cooked?

to make it easier to digest

to improve the flavour


How can food be cooked?

Do you recognise these different ways of cooking?

In each case write down the name of the method.


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

microwave cooker







Cooking is a chemical change hot air.

  • This means...

  • a new substance is made

  • it cannot be reversed

  • an energy change takes place



Potatoes are a good source of ___________ hot air.

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.



Eggs (and meat) are good sources of _______. hot air.

protein

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


Baking powder hot air.

  • 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.


Baking powder hot air.

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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