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© Oxford University Press 2011 IC1.26.3 Emulsions Emulsions
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© Oxford University Press 2011 IC1.26.3 Emulsions
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© Oxford University Press 2011 IC1.26.3 Emulsions Vegetable oils and water don’t mix together well … The oil floats on the water
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© Oxford University Press 2011 IC1.26.3 Emulsions Vegetable oil molecules have long hydrocarbon chains
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© Oxford University Press 2011 IC1.26.3 Emulsions They cannot interact with small water molecules
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© 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?
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© 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.
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© 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)
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© 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
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© 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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