Solutions Test Review- Illuminate ?s

The dissolved substance in a solution is the

• solute
• solvent
• tincture
• suspension

Ricardo tested different aqueous solutions to find the solution with the highest conductivity. The diagram shows the apparatus he used, and the table shows the aqueous solutions he tested.
Aqueous Solutions (aq)
CH3OH
KCl
NH3
C12H22O11 

• CH3OH(aq) because it is an electrolyte
• NH3(aq) because it is a weak electrolyte
• KCl(aq) because it is a strong electrolyte
• C12H22O11(aq) because it is a nonelectrolyte

Tags

NGSS.MS-PS1-2

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?

• The water was stirred.
• The sugar was cooled.
• The sugar settled to the bottom.
• The water evaporated from the top.

Tags

NGSS.MS-PS1-2

Chemical Z is a red solid that forms large crystals. The solubility of chemical Z in water at different temperatures is shown below. 
Michael wants to dissolve 75 grams of Z in 0.5 liter of water. He does so by crushing the Z crystals into a fine powder and then stirring 75 grams of the powder into 0.5 liter of water at 25°C. How could Michael change his method to dissolve all the Z faster?

• He could add the Z crystals directly to the water without crushing them first.
• He could increase the temperature of the water to 50°C.
• He could increase the temperature of the water to 30°C.
• He could add the Z powder to the water but refrain from stirring the mixture.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following decreases the dissolving rate of a solid in water?

• raising the temperature
• stirring constantly
• using larger pieces of solid
• crushing the solid

The graph shows a solubility curve for an unknown substance. 
 
 
A solution is made with 80 grams of the substance completely dissolved in 100 grams of water at 60°C. The solution is cooled to 23°C. About how many grams of the substance precipitated out of the solution at 23°C?

• 20 grams
• 40 grams
• 60 grams
• 80 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

The graph shows a solubility curve of a soluble substance. 
 
What is the maximum amount of the substance that will dissolve in 100 cm3 of water at 30°C?

• 25 grams
• 37 grams
• 55 grams
• 125 grams

Tags

NGSS.HS-PS1-3

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?

• 35 grams
• 40 grams
• 80 grams
• 100 grams

Tags

NGSS.MS-PS1-2

What is the range of the pH scale in general use?

• -1 to 1
• 0 to 1
• 0 to 14
• 1 to 7

Which of the following is a characteristic of a base?

• pH greater than 7
• pH between 4 and 13
• pH between 4 and 9
• pH less than 7