Unit Test : Properties of Materials

A solute is a solid that ​ (a)   in a liquid. The liquid it dissolves into is called a ​ (b)   Together they make a ​ (c)   A solid that does not dissolve in a liquid is called ​ (d)   The solubility of a solid measures how much of a solute will dissolve. When you measure the solubility of a solute you must use the same ​ (e)   and type of solvent at a given temperature.

• dissolve
• solvent
• solution
• insoluble
• volume
• mixture
• mass
• saaturated
• solid
• soluble

The table gives the colors and solubility in water of four compounds. The compounds were added to separate beakers of water. There was enough water to dissolve the soluble compounds completely. The contents of each beaker were filtered.

1. One of the compounds left a white solid in the filter paper. What is the name of this compound?​ (a)  

2. What is the color of the filtrate from this beaker?​ (b)  

• Zinc Carbonate
• Colorless
• Sodium Chloride
• White
• Green

Some students have been investigating the mass of copper sulfate that can be dissolved in water at different temperatures. They added copper sulfate until no more would dissolve and they carefully measured the mass of copper sulfate they added. the result as shown in the table.

a. What name is given to a solution when no more of the solute can be dissolved in it?​ (a)  

b. What range of temperatures did the students use?​ (b)  

c. What interval did they use for the temperatures?​ (c)  

d. What is a variable that the students should keep the same? ​ (d)  

e. Which is the independent var​iable? ​ (e)   ​

• saturated
• 20-80
• 10
• Volume of water
• Temperature of water
• unsaturated
• supersaturated
• 22-58
• 2
• Mass of water

Increasing the temperature generally increases the solubility of most solid solutes in water.

• True

• False

Which of the following parameters can affect the solubility of a substance?

• Temperature

• Pressure

• Surface area of the substance

• All of them are correct

How does increasing the pressure affect the solubility of a gas in a liquid?

• Increases the solubility

• Decreases the solubility

• Has no effect on the solubility

Substance R and Substance S are examined for their solubility in water at a given temperature.

Substance R completely dissolves in 150 mL of water, whereas Substance S only partially dissolves in the same volume of water.

Which statement is correct regarding their solubility?

• Substance R has higher solubility than Substance S.

• Substance S has higher solubility than Substance R.

• Both substances have equal solubility.

• The solubility cannot be determined from the given information.

At 0°C, the solubility of O2 in water is 14.6 mg/L. At 25°C, the solubility of O2 in water is 8.6 mg/L.

What can you conclude from this explanation?

• increasing the temperature causes a decrease in the solubility of O2 in water.

• decreasing the temperature causes a decrease in the solubility of O2 in water.

• increasing the temperature causes an increase in the solubility of O2 in water.

• We can't conclude anything from this explanation because of missing some information.

How many grams of Potassium Nitrate (KNO3) can dissolve in 100 grams of water at 25°C, if the solubility of KNO3 in water at this temperature is 32 grams per 100 grams of water?

• 32 grams

• 100 grams

• 320 grams

• 25 grams

At 0°C, the solubility of NaCl in water is 35.7 grams per 100 grams of water. At 100°C, the solubility of NaCl in water is 39.2 grams per 100 grams of water.

What can you conclude from this explanation?

• The solubility of NaCl in water decreases as temperature increases

• The solubility of NaCl in water increases as temperature decreases

• The solubility of NaCl in water increases as temperature increases

• The solubility of NaCl in water decreases as temperature decreases