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© Oxford University Press 2011 IC1.26.3 Emulsions Emulsions.

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Presentation on theme: "© Oxford University Press 2011 IC1.26.3 Emulsions Emulsions."— Presentation transcript:

1 © Oxford University Press 2011 IC1.26.3 Emulsions Emulsions

2 © Oxford University Press 2011 IC1.26.3 Emulsions

3 © Oxford University Press 2011 IC1.26.3 Emulsions Vegetable oils and water don’t mix together well … The oil floats on the water

4 © Oxford University Press 2011 IC1.26.3 Emulsions Vegetable oil molecules have long hydrocarbon chains

5 © Oxford University Press 2011 IC1.26.3 Emulsions They cannot interact with small water molecules

6 © Oxford University Press 2011 IC1.26.3 Emulsions Questions  What happens when you mix oil and water?  Why don’t oil and water mix well?

7 © Oxford University Press 2011 IC1.26.3 Emulsions If you add an emulsifier to oil and water and mix well, the oil and water no longer separate out. An emulsion forms.

8 © Oxford University Press 2011 IC1.26.3 Emulsions One end interacts well with water molecules (hydrophilic end) the other end interacts well with oil molecules (hydrophobic end)

9 © Oxford University Press 2011 IC1.26.3 Emulsions Emulsifier molecules coat the surface of oil droplets. These coatings keep the oil droplets evenly dispersed in the water

10 © Oxford University Press 2011 IC1.26.3 Emulsions Questions  What type of molecules do emulsifiers have?  How do emulsifiers stop oil and water separating out?


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