AnswersChemistryMixtures, Solutions, and Solubility

Mixtures, Solutions, and Solubility — Test Answers

25 verified answers
1
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Which two solutions have similar solubilities at 40 times degree C ?

A
Na sub 2 HAsO sub 4 and NaCl
B
Ba open paren NO sub 3 close paren sub 2 and Ce sub 2 times open paren SO sub 4 close paren sub 3 times 9 cap h sub 2 cap o
C
Na sub 2 HAsO sub 4 and Na sub 2 SO sub 4
D
Na sub 2 SO sub 4 and NaCl
2
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What is the solubility of Na sub 2 HAsO sub 4 at 60 times degree C ?

A
20 g over 100 mL of water
B
65 g over 100 mL of water
C
70 g over 100 mL of water
D
46 g over 100 mL of water
4

What should this mixture be classified as?

A
compound
B
solution
C
colloid
D
suspension
7

Which best describes the Tyndall effect?

A
the scattering of light by solvent in a solution
B
the scattering of light by solutes in a solution
C
the scattering of light by particles in a mixture
D
the scattering of light by solutes in a mixture
8

Which is true about the dissolving process in water?

A
Water molecules are attracted by solute ions at the surface of the solute.
B
Polar solutes do not dissolve easily in water.
C
Solute molecules pull water molecules away from the surface.
D
Water molecules move throughout the solute.
9

What type of mixture scatters light and cannot be filtered easily?

A
a colloid, a homogeneous mixture
B
a solution, a heterogeneous mixture
C
a solution, a homogeneous mixture
D
a colloid, a heterogeneous mixture
11

Which solution is a homogeneous mixture?

A
salt and water
B
sand and water
C
soil
D
salad dressing
13

Which statement best explains the symbol NaCl ?

A
moles of water per liter of solution
B
moles of water per liter of NaCl
C
moles of NaCl per liter of water
D
moles of NaCl per liter of solution
14

Which statement best describes a true solution?

A
A true solution coagulates when heated or boiled.
B
A true solution will settle out after a short period of time.
C
A true solution has a cloudy appearance.
D
A true solution will not separate in a centrifuge.
15

A number of beakers have different concentrations of a solution. Which statement best describes the most concentrated solution?

A
It has the greatest amount of solute.
B
It has the most volume for a given amount of solute.
C
It has the most solute for a given volume.
D
It has the largest volume.
17

Which factor causes a decrease in the rate of dissolution?

A
decreasing the surface area of the solute
B
increasing the stirring of the solution
C
decreasing the amount of solute
D
increasing the temperature of the solvent

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