chemistry unit 1 section 5

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plant materials are rich in oils, how do we extract this oil?
by crushing the plant material and pressing oils out, in some cases by distillation when water and other impurities are removed.
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vegetable oils provide
energy in the form of fats and sugars.
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what else do vegetable oils provide which is useful to the human body?
nutrients
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vegetable oils have good properties for cooking including...
higher boiling points than water so allow us to cook at higher temperatures and lubrication for foods.
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what affect dose cooking with oils have?
higher temperatures allow faster cooking and improved taste and more energy in the food.
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oils do not dissolve in water. they can be used to produce emulsions.what makes emulsifiers better as a resource?
emulsifiers have a thicker viscosity than both oil and water so have many different uses such as improving texture and appearance of food.
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emulsifiers have both hydrophilic and hydrophobic properties, define hydrophilic and hydrophobic
hydrophilic means to be attracted to water, whereas hydrophobic means to repel water, to have both means it can mix with water and oils well.
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testing with unstaurated alkene and saturated alkane...
the bromine water is used up and turns colourless when the alkene is shaken into the bromine water (dilute bromine solution) alkane when shaken stays the same.
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unsaturated double bonded fats called alkenes can be hardened. describe the process!
reacting the unsaturated oils with hydrogen in the precence of a NICKLE catalyst at around 60'c, the hydrogen adds to the double carbon-carbon bonds.
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hydrogenated oils have...
higher melting points so can be a solid at room temperature making them useful as spreads.
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Card 2

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vegetable oils provide

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energy in the form of fats and sugars.

Card 3

Front

what else do vegetable oils provide which is useful to the human body?

Back

Preview of the front of card 3

Card 4

Front

vegetable oils have good properties for cooking including...

Back

Preview of the front of card 4

Card 5

Front

what affect dose cooking with oils have?

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