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is also need to dissolve enzymes and nutrients in the alimentary canal, so that digestion can take place

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plasma, the liquid part of blood, contains a lot of water, so that substances like glucose can dissolve in it

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is really important for metabolic reactions that can only take place if the chemicals which are reacting are dissolved in water

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State that water is important as a solvent

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State that water is important as a solvent

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dissolve fats in ethanol and than put the emulsion in water, if there is any fat in the emulsion than it breaks up into millions of tiny droplets

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the test for proteins is called biuret test. This involves mixing the food in water, and then adding dilute copper sulfate solution. Then dilute potassium hydroxide solution is gently added.
contain protein -> purple colour
don’t contain protein -> stays blue

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we can test for the presence of sugars by adding Benedict's solution to a food, and heating it.
contain reducing sugar -> brick-red colour
no reducing sugar -> remains blue

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detect the presence of starch in a sample.
contain starch  -> reacts with the starch molecules to form a blu-black color
don’t contain starch -> remains orange brown

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ethanol emulsion test for fats and oils

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biuret test for proteins

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Benedict’s solution to test for reducing sugars

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iodine solution to test for starch

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a fat molecule is made of four smaller molecules joined together. One of these is glycerol, attached to it there are three long molecules called fatty acids

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protein molecules are made of long chains of smaller molecules called amino acids joined end to end

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Starch and glycogen are both polysaccharides composed of glucose molecules joined together in a long chain

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fats and oils from fatty acids and glycerol

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proteins from amino acids

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starch and glycogen from glucose

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State that large molecules are made from smaller molecules, limited to:

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State that large molecules are made from smaller molecules, limited to:

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contain carbon, hydrogen and oxygen, but also nitrogen and small amount of sulfur

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composed of the elements carbon, hydrogen, and oxygen

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composed of the elements carbon, hydrogen, and oxygen in a ratio of 1:2:1

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proteins

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fats

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carbohydrates

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List the chemical elements that make up:

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List the chemical elements that make up: