Skin Care

Question 1

Brief description of UV light

Answer 1

• high emitting light (from sun)
• causes ageing and sunburn
• blocked by sunblock

Question 2

Define free radicals ?

Answer 2

Highly reactive species with an unpaired electron

Question 3

How are free radicals formed ?

Answer 3

They are formed when UV light breaks bond

Question 4

Name the 3 steps in order

Answer 4

Initiation

Propagation

Termination

Question 5

Free radical scavengers are found in ?

Uses

Answer 5

Found in cosmetics and plastics

Question 6

Free radical scavengers react with free radicals to form stable molecules. (That’s a fact)

Answer 6

.

Question 7

Initiation goes no dots to two dots

Propagation goes one dot to one dot

Termination goes two dots to no dots

Answer 7

.

Draw each stage once now

Question 8

Why and what contains free radicals ?

Answer 8

Many sun creams contain free radicals to form stable molecules which prevents chain reactions

Question 9

What uses free radical scavengers and why?

Answer 9

Plastics - use free radical scavengers to prevent them breaking down under UV light and oxygen

Food products - slow down rate of oxidation