Colloids2008

Heterogeneous Mixtures

December 3, 2009

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Objectives

1. Compare and contrast a solution, suspension and a colloid

2. Describe and give examples of suspensions and colloids

Solutions

• Have dissolved particles

• Do not separate

• Cannot be filtered

• Do not scatter light

The individual components of a mixture are present in

A. similar amounts

B. regular amounts

C. fixed amounts

D. different amounts

Which of the following is a homogeneous mixture?

A. fruit salad

B. kool aide

C. chocolate chip cookie

D. a bowl of yogurt and fruit

What is considered to be the universal solvent?

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.

Examples of Suspensions

Snow globes

Muddy water

Salad dressing

Paint

Colloids

A colloid is a mixture that has the properties of both a solution and a suspension.

ColloidsParticles are small but do not dissolve

Mixture can not be separated by passing them through a filter.

The particles in a suspension are _________ than the particles in a colloid.

a. larger

b. smaller

c. more soluble

d. less soluble

Tyndall effect

Colloidal suspensions can scatter rays of light.

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

Examples of Colloids

Fog

Whipped cream

Milk

Cheese

Blood plasma

Jell-o

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