CHEMISTRY MODULE 1.6.3

Question	Answer
What do all vegetable oil molecules contain?	Chains of Carbon atoms with Hydrogen attached to them.
What are the molecules like in some vegetable oils and how are they bonded?	They are only carbon and they're joined together by double bonds.
What are these called?	Unsaturated oils.
How do we detect unsaturated oils?	Reacting them with Bromine or Iodine which then decolourises.
What form are vegetable oils in at room temperature?	Liquids.
How can the melting point of these oils be increased?	By reacting them with Hydrogen in the presence of a Nickel catalyst at 60 Degrees.
What does this reaction do?	It replaces some or all of the carbon to carbon double bonds with single bonds.
What is the result of this reaction?	The melting point is higher and the oil becomes a solid at room temperature.
What is this process called?	Hardening
What are oils that have undergone this process are sometimes called...	Hydrogenated Oils
Why do Hydrogenated oils have a higher melting point?	because as the straighter chains attract each other more they are solids at room temperature.

Resource summary

	Created by Iona Diack about 9 years ago