colloids2008[1]
TRANSCRIPT
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Notes: Heterogeneous Mixtures
H: It’s All Mixed Up
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Heterogeneous mixtures
November 20, 2008
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Objectives
1. Compare and contrast a solution, suspension and a colloid
2. Describe and give examples of suspensions and colloids
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Solutions
• Have dissolved particles
• Do not separate
• Cannot be filtered
• Do not scatter light
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The individual components of a mixture are present in
a. similar amounts
b. regular amounts
c. fixed amounts
d. different amounts
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Which of the following is a homogeneous mixture?
a. fruit salad
b. shaving cream
c. chocolate chip cookie
d. a bowl of yogurt and fruit
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What is considered to be the universal solvent?
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Suspensions
A heterogeneous mixture in which particles of the material are dispersed throughout a liquid or gas.
The particles in a suspension are insoluble, so they settle out.
Can be separated by passing them through a filter.
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Examples of Suspensions
Snow globes
Muddy water
Salad dressing
Paint
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Colloids
A colloid is a mixture that has the properties of both a solution and a suspension.
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ColloidsParticles are small but do not dissolve
Mixture can not be separated by passing them through a filter.
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Tyndall effect
Colloidal suspensions can scatter rays of light.
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How are colloids similar to solutions?
a. Both are mixtures
b. Both contain dissolved solutes
c. Both can be separated
d. Both scatter beams of light
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5 types of colloids
Sols
Gels
Aerosols
Foams
Emulsions
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Examples of Colloids
Fog
Whipped cream
Milk
Cheese
Blood plasma
Jell-o
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The particles in a suspension are _________ than the particles in a colloid.
a. larger
b. smaller
c. more soluble
d. less soluble
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If the label on a medicine bottle says "shake well before using", the medicine is probably a
a. solution
b. suspension
c. colloid
d. compound