Emulsions Flashcards
What is an emulsion?
A mixture of oil and water
Emulsions are made up of lots of droplets of one liquid suspended in another liquid
How thick are emulsions?
Thicker than either the oil or the water
What is an example of a use of an emulsion?
In food, salad dressings
In moisturising lotions
What happens when you add more oil to a oil-in water emulsion?
It becomes thicker
What is an emulsifier?
A molecule with one part that is attracted to water and another part that is attracted to oil
What are he parts attracted to the water and the oil called
Water = hydrophilic
Oil=hydrophobic
What happens to both ends of each emulsifier?
The hydrophilic end latches onto water molecules
The hydrophobic end end latches onto oil molecules
What happens when you shake an oil, water and emulsifier together?
The oil forms droplets surrounded by a coating of emulsifier with the hydrophilic bit facing outwards and other oil droplets are repelled by the hydrophilic bit of the emulsifier while water molecules latch on so the emulsion won’t separate out
What is one pro and one con of using emulsifiers?
Stopping Emulsions from separating out gives them a longer shelf life
People are allergic to certain emulsifiers (egg)
What can’t oil do ?
Dissolve in water
What two types of emulsions can you can?
Oil in water emulsion
Water in oil emulsion
