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A molecule of an unsaturated oil - PowerPoint PPT Presentation


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A molecule of a saturated fat. A molecule of an unsaturated oil. Both fat and oil molecules have a ‘tuning fork’ shape. The fat, however, has ‘straighter’ chains than the more zig –zag shaped chains in the oil. Unsaturated oils quickly decolourise bromine solution but fats do not.

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slide1

A molecule of a saturated fat

A molecule of an unsaturated oil

Both fat and oil molecules have a ‘tuning fork’ shape. The fat, however, has ‘straighter’ chains than the

more zig –zag shaped chains in the oil.

Unsaturated oils quickly decolourise bromine solution but fats do not.

slide2

The saturated fat molecules can pack closely together.

Because the fat molecules can pack together more closely the van der Waal’s forces between the molecules are stronger than in oils. This gives gats a higher melting point than oils.

The zig-zag chains in the unsaturated oil molecules means that they cannot pack together as closely as the fat molecules.

Fats are solids at room temperature and oils are liquids.