Plant Oils/ Emulsions & Unsaturated/Saturated Oils 0.0 / 5 ? ChemistryPaints and oilsGCSEAQA Created by: MillieCreated on: 28-05-13 17:36 Can can the oil be extracted from some fruits, nuts and seeds? Crushing- the oil is removed by pressing the oil out & distillation, water & other impurities are then removed 1 of 8 Why are vegetable oils important? They can be used in food & fuels and can provide us with energy and nutrients 2 of 8 Why are vegetables oils used in foods? Higher boiling points than water, quicker cooking and different flavours 3 of 8 What properties do emulsions have? Hydro-phillic and hydro-phobic 4 of 8 What bond holds unsaturated vegetable oils and what can these be detected by? Carbon to carbon double bonds and bromine water 5 of 8 What is the method of hydrogenation? Vegetable oils that are unsaturated can be hardened by reacting them with hydrogen in the presence of a nickel catalyst at about 60 degrees Celsius 6 of 8 How does hydrogenation harden vegetable oils? Hydrogen adds to the carbon to carbon double bonds, the hydrogenated oils then have a higher melting point so that they are solids at room temperature 7 of 8 Name 2 uses for hydrogenated oils (Choose 2) Used as spreads, used in cakes, pastries and other deserts. 8 of 8
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