Matter & Solutions Test

What happens to the solubility of potassium nitrate (KNO3) as the temperature rises?

• The solubility of potassium nitrate increases as the temperature increases
• The solubility of potassium nitrate decreases as the temperature increases
• The solubility of potassium nitrate stays the same as the temperature increases
• The solubility of potassium nitrate increases as the temperature decreases

According to the graph, which of the compounds is most soluble at 0°C?

• KI
• NaNO3
• KNO3
• NH4Cl
• NH3

According to the graph, which of the compounds is least soluble at 0°C?

• KI
• NaNO3
• KNO3
• NH4Cl
• NH3

Exactly 3 g of orange crystals were mixed with 20 mL of water to form a solution. In the solution, the orange crystals were which one of the following?

• Solute
• Solvent
• Transparent
• Saturate

Which one of the following statements best describes what is happening to boiling saltwater in a beaker?

• The water is evaporating.
• The water is disappearing.
• The water is dissolving.
• The water is drying.

A student is given two bottles, labeled A and B, that contain two different white solids. He adds 2 grams of substance A to test tube A and 2 grams of substance B to test tube B. He then adds 8 mL of a clear, colorless liquid to each tube and shakes both tubes until no white solid can be seen in either of them. He then adds 2 more grams of substance A to test tube A and 2 more grams of substance B to test tube B. After shaking both tubes for a while, he let them stand for a day. Which of the following statements is correct?

• In the clear, colorless liquid, solid A is more soluble than solid B.
• In the clear, colorless liquid, solid B is more soluble than solid A.
• In the clear, colorless liquid, solids A and B are both insoluble.
• Only 4 grams of solid B will dissolve in 8 mL of the liquid.

A student is given two bottles, labeled A and B, that contain two different white solids. He adds 2 grams of substance A to test tube A and 2 grams of substance B to test tube B. He then adds 8 mL of a clear, colorless liquid to each tube and shakes both tubes until no white solid can be seen in either of them. He then adds 2 more grams of substance A to test tube A and 2 more grams of substance B to test tube B. After shaking both tubes for a while, he let them stand for a day. What is the liquid above solid A?

• Water
• A mixture of water and solid A
• A saturated solution of solid A
• An unsaturated solution of solid A

How long was the substance heated before it reached 80°C?

• 4 minutes
• 5.75 minutes
• 10.5 minutes
• 11 minutes, 30 seconds

What is the melting point of this substance?

• 100°C
• 20°C
• 0°C
• −10°C

A solid is a state of matter that has a(n)

• indefinite volume and an indefinite shape.
• definite volume and a definite shape.
• definite volume and an indefinite shape.
• indefinite volume and a definite shape.