Skin care

Question 1

What is the effect of UV light on the body?

Answer 1

Ultraviolet light is high-energy which can break bonds within molecules.

Question 2

What is a free radical?

Answer 2

A free radical is an atom (or molecule) that is highly reactive as it has an unpaired electron, eg. H·

Question 3

What are the three stages of a free radical chain reaction?

Answer 3

1. Initiation
2. Propagation
3. Termination

Question 4

Initiation

Answer 4

All the free radicals will be on the products side.

Question 5

Propagation

Answer 5

There will be a free radical on both the product and reactant side.

Question 6

Termination

Answer 6

Both free radicals will be on the reactant side.

Question 7

What are free radical scavengers?

Answer 7

1. Free radical scavengers are molecules that react with free radicals to form stable molecules.
2. 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.