Skin care Flashcards
What are the steps of free radical reactions
Initiation
propagation
termination
Give examples of oxidising agents
copper (II) oxide
acidified dichromate solution
What type of compound is added to products to prevent free radical chain reactions from occurring
free radical scavengers
State what is meant by the term free radical scavenger
molecules that can react with free radicals to form stable molecules and prevent chain reaction
State what is meant by the term free radicals
atoms with an unpaired electron
Describe how free radicals are formed
Bond breaking by UV light
What is UV
high energy form of light present in sunlight
What can UV light do
can provide sufficient energy to break bonds within molecules which causes sunburn
What is the function of free radicals in cosmetic products
to prevent damage from free radicals scavengers to skin cells
How do the chemicals present in sun block prevent sunburn
they block UV light preventing the formation of free radicals
Name the type of particles that antioxidants react with preventing cellular damage and skin ageing
free radicals
What is the molecular formula for vitamin c
C6H806
What does sun block do
prevent UV light reaching the skin
What products can free radical scavengers be added to
cosmetics
food products
plastics
State what provides the energy to break the bonds in chlorofluorocarbons in the upper atmosphere
UV radiation
Give an example of a free radical scavanger
antioxidants
Name a product that could contain free radical scavangers
food
What is required for initiation to take place
UV
do propagation and termination need UV
no so the reaction can continue in darkness
