Skin care Flashcards
Describe the reaction ultraviolet light can have on the body
Ultraviolet (UV) light is high-energy which can break bonds within molecules (causing sunburn, ageing and cancer).
Describe the term free radical
A free radical is an atom (or molecule) that is highly reactive as it has an unpaired electron, eg H·
Bond breaking by UV (light) or
example of initiation reaction
(equation or diagram).
State, recognise and write the steps involved in a chain reaction
Initiation
Propagation
Termination
Initiation
All the free radicals will be on the products side.
Propagation
There will be a free radical on both the product and reactant side.
Termination
Both free radicals will be on the reactant side.
Explain the term free radical scavengers and give examples of when they would be used
Free radical scavengers are molecules that react with free radicals to form stable molecules.
They are added to skin care products, cosmetics, plastics and foods to prevent any chain reactions from taking place for example, preventing bonds breaking in your skin.
