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Section 15.4
Heterogeneous Mixtures
Practice Test |
| 1. | A suspension is _________. |
| a. | a heterogeneous mixture | ||||
| b. | a homogeneous mixture | ||||
| c. | a solution | ||||
| d. | impossible to prepare | ||||
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| 2. | A colloid contains particles that ____________________. |
| a. | are smaller than atoms | ||||
| b. | are between 1 nm and 1000 nm in diameter | ||||
| c. | settle out if left undisturbed | ||||
| d. | are atomic-size in scale | ||||
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| 3. | The Tyndall effect describes ______________. |
| a. | precipitation of colloidal particles using electrically charged plates | ||||
| b. | the adsorption of positive ions onto the surface of a hydrophilic solid | ||||
| c. | hydrophobic interactions between nonpolar molecules | ||||
| d. | the scattering of light by colloidal particles | ||||
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| 4. | Which one of the following is an example of an emulsion? |
| a. | shaving cream | |||
| b. | fog | |||
| c. | mayonnaise | |||
| d. | styrofoam |
Answers: a b d c
hmmmm
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