1.What is the maximum amount of the substance that will dissolve in 100 3
cm of water at 30°C?
A. 25 g
B. 33 g
C. 57 g
D. 125 g
2. The graph shows the solubility curve of an unknown salt. The four points on the diagram represent four solutions of the unknown salt.
Which point represents a supersaturated solution of the unknown salt? A. Q
B. R
C. S
D. T
3. The illustration below lists the pH of various substances.
Which of the following substances is the closest to a neutral pH?
A. milk
B. vinegar
C. ammonia
D. milk of magnesia
4. The figure below shows where solution X and solution Y fall on the pH scale.
Which statement correctly compares solutions X and Y?
-
A. Solution X has a higher concentration of hydroxide ions (OH ) than
solution Y.
3+
B. Solution X has a higher concentration of hydronium ions (H O ) than solution Y.
3+
C. Solution X and Y have equal numbers of hydronium (H O ) and
-
hydroxide (OH ) ions.
3+
D. Solution Y has a higher concentration of hydronium ions (H O ) than solution X.

5. The graph below shows the amount of salt that dissolves in 100
milliliters (mL) of water at various temperatures.

Based on the graph, what is the likely amount of salt that will dissolve in 200 mL of water at 90°C?
A. 35 grams
B. 40 grams
C. 80 grams
D. 100 grams

6. The graphic shows sugar in a cup before and after it has dissolved.
Which action most likely occurred in order for the sugar to dissolve?
A. The water was stirred.
B. The sugar was cooled.
C. The sugar settled to the bottom.
D. The water evaporated from the top.
7. Look closely at the illustration below showing where the compound
sodium hydroxide falls on the pH scale.

What type of compound is sodium hydroxide?
A. acid
B. base
C. element
D. salt

8.The graph shows the solubility of carbon dioxide (CO ) in water at
different temperatures.
Explain how temperature affects the solubility of carbon dioxide in water.
9.The graph shows solubility curves for four salts across different
Temperatures.
How many grams of NaCl will dissolve in 100 grams of water at 100°C?
A. 10 g
B. 33 g
C. 40 g
D. 42 g

10. The graphic shows an investigation being performed by four students.
Each student will pour 10 grams of sugar into 100 milliliters of water into
his or her container. They will stir the water gently for 20 seconds. Which
student's sugar will most likely dissolve the fastest?
A. Jennie
B. Al
C. Adriane
D. Marcus

11.Which of the following is NOT a way to increase the solubility of a solid
in water?
A. crushing the solid
B. shaking the mixture of solid and water
C. raising the temperature of the water
D. letting the mixture stand still a long time

12.The dissolved substance in a solution is the
A. solute.
B. solvent.
C. tincture.
D. suspension.

13.Which of the following refers to the concentration of a substance?
A. the size of the particles that make up a substance
B. the grams of solute dissolved per 100 g of solvent
C. the minimum volume of solvent dissolved per liter of solution at a
given pressure
D. the maximum amount of a solute that can be dissolved in a solvent
at a given temperature

14.A soil sample with a pH of 4.5 is
A. neutral.
B. acidic.
C. basic.
D. inconclusive.

15.Which of the following combinations would create the fastest chemical
reactions?
A. a whole antacid tablet and vinegar at 25 degrees Celsius
B. a whole antacid tablet and vinegar at 50 degrees Celsius
C. a crushed antacid tablet and vinegar at 25 degrees Celsius
D. a crushed antacid tablet and vinegar at 50 degrees Celsius

16.What substances change color when added to acids or bases?
A. indicators
B. electrolytes
C. insulators
D. capacitors

17.The table below shows four solutions that were prepared by dissolving
salt in water.
Which of the solutions has the highest salt concentration?
A. Solution A
B. Solution B
C. Solution C
D. Solution D