2i) - Skin Care Flashcards
What is UV radiation
Ultraviolet (UV) radiation is a high energy bond form of light, present in sunlight
What can UV radiation provide energy for
UV radiation can provide sufficient energy to break bonds within molecules
What can the breaking of molecules by UV cause
This causes sunburn and accelerates ageing of the skin
What do sun block products do
Sun- block products prevent UV light reaching the skin
What happens when UV light breaks bonds
When UV light breaks bonds, free radicals are formed
What are free radicals
Free radicals are atoms or molecules that are highly reactive due to the presence of unpaired electrons
What steps do free radical chains include
Free radical chains include the soloowijfbsteps : initiation, propagation and termination
What is the overall reaction for hydrogen and chlorine
H2(g) + Cl2(g) ———> 2HCl(g)
Initiation of hydrogen and chlorine
Cl2(g) ——> Cl. (g) + Cl. (g)
Propagation of hydrogen and chlorine
H2(g) + Cl. ——> H.(g) + HCl(g)
H.(g) Cl2(g) ——> HCl (g) + Cl.(g)
Termination of hydrogen and chlorine
H.(g) + Cl.(g) ——> HCl(g)
H.(g) + H.(g) ——> H2(g)
Cl.(g) + Cl.(g) ——> Cl2(g)
What are free radical scavengers
Free radical scavengers are molecules that react with free radicals to form stable molecules and prevent chain reactions from occurring
What are free radical scavengers added to
Free radical scavengers are added to many products including cosmetics, food products and plastics
