science c1 plant oils

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  • Created by: zai_nan
  • Created on: 09-05-15 11:28
where are vegetable oils found ?
in seeds,nuts and some fruits
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what do unsaturated fat /oils tend to be like ?
they tend to be liquid at a room temperature ,
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what do saturated fats/oils tend to be like
they tend to be solid at a room temperature
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what is bromine water used for ?
to test if its saturated or unsaturated fat/oil and if it becomes colourless or stays orange
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what happens when bromine water is added with unsaturated oil ?
it becomes colourless
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which chemical is needed to harden vegetable oils ?
hydrogen
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what conditions are needed for hydrogenation of vegetable oils ?
60 degrees and a nickel catalyst
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what is mayonnaise an example of
emulsion
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vegetable oils have a higher boiling points than water this means that ?
food can be cooked at high temperatures in oil than it can in water
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do vegetable oils disolve in water
no
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name two products that are emulsions
whipped cream and ice cream
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what do monounsaturated fats have
one double bond in each fatty acid
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what do polyunsaturated fats have
many double bonds
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evaluate saturated oils
they only have single bonds between their carbon atoms . its a solid at a room temperature
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evaluate unsaturated oils
they have double bond between their carbon atoms . its a liquid at a room temperature , more healthier
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what are the benefits of using vegetable oil to cook than boiled cooking
cook faster , different flavours and has more energy
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what happens when you over use cooking oil ?
you become overweight
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evaluate the uses of plant oils
it can be used for cooking ( contains nutrients and energy ) . used for cosmetics ( make up , perfume ,) and biofuels
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describe the steps of pressing olive oil
the plant materiel is crushed then the next step is to press the crushed plant between metal plates and squash the oil out with force . after this water and other impurities can be removed from the oil.
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describe how plant oils is made by distillation
water is used to evaporate the oil then it condenses back into liquid and separates the water
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how can emulsions be made
oil and water
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what are emulsions made up of
lots of droplets of one liquid suspended in another liquid
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name one chemical that is an emulsifier
egg yolk
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what does hydrophobic mean ?
tending to repel and not absorb water
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what does emulsifiers do ?
stops emulsions from separating out
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Other cards in this set

Card 2

Front

what do unsaturated fat /oils tend to be like ?

Back

they tend to be liquid at a room temperature ,

Card 3

Front

what do saturated fats/oils tend to be like

Back

Preview of the front of card 3

Card 4

Front

what is bromine water used for ?

Back

Preview of the front of card 4

Card 5

Front

what happens when bromine water is added with unsaturated oil ?

Back

Preview of the front of card 5
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