C1- Plant Oils Flashcards
What type of of fuel is produced from vegetable oil?
Biofuel or biodiesel
Why are vegetable oils used as food and fuels?
They provide a lot of energy
What is used to test for unsaturated oil? Give the result of the test.
Bromine water,turns from orange to colourless
Why are some foods cooked in vegetable oils?
Cooks faster,taste better,better colour and better texture
Describe how to make an emulsion from cooking oil and water?
Shake or stir vigorously or beat together ( could also add a emulsifier.
Mayonnaise is made from oil,vinegar and egg yolk. What is the purpose of the egg yolk?
Emulsifier,to prevent the oil and vinegar/water separating or to keep emulsion stable
Why are emulsion more useful than separate oil and water?
They are thicker than the oil and water they are made from, have better texture,appearance and ability to coat or stick to solids ( for foods: taste better/smoother
Why should you know what types of fats are in the food you eat?
Some fats/saturated fats can cause health problems
Sunflower seeds contain vegetable oil. Outline a method you could use to separate some oil from the seeds
Crush the seeds, press the seeds, collect liquid, separate oil from water
a. Describe the reaction and conditions used to hydrogenate vegetable oils
b. Why is this done?
a. React with hydrogen at 60 degrees with a nickel catalyst
b. To harden the oils,to make the oils saturated
Describe how an emulsifier works
Emulsifier molecules have a hydrophilic or water- loving part (head) and a hydrophobic or water- hating part (tail). The hydrophobic part goes into the oil droplets and the hydrophilic part stays at the surface keeping the droplets apart ( dispersed) in water.
