PS Unit 5.10

Which of the following statements regarding NaCl(aq) is NOT correct?

• covalent

• conducts electricity

• strong electrolyte

• has a crystalline, ordered structure

As a solution is evaporated the concentration ?

• decreases

• remains the same

• becomes a lighter color

• increases

When sugar is added to water to make lemonade, the sugar is considered the ?

• Solute

• Solvent

• Solution

• Supernate

Which of the following would NOT increase the rate a candy cane dissolves in water?

• Reducing the amount of water.

• Crushing the candy cane into small pieces.

• Heating the water before adding the candy cane.

• Agitating / stirring the solution.

Which of the following substances when dissolved in water does NOT increase in solubility as the temperature increases?

• O₂ (oxygen gas)

• NaHCO3 (baking soda)

• K₂Cr₂O7 (potassium dichromate)

• MgSO4 (epsom salt)

Which of the following is the name we give to the lab technique in which a biuret or pipette is used to determine the buffering capacity of an acid?

• titration

• spectroscopy

• chromatography

• distillation

According to the solubility diagram, which of the following substances is unsaturated at 50g of solute at 50°C?

• KNO3

• KCI

• KCIO3

• NaCl

The temperature of a saturated solution was increased and additional solute was added. The solution was gently cooled. Which of the following statements about this final solution is NOT correct?

• A common example is a reusable heat pack.

• Called a supersaturated solution.

• An added seed crystal will force crystallization of the solution.

• A stable solution which rarely precipitates.

According to the solubility diagram, which of the following substances is unsaturated at 50g of solute at 50°C?

A. 70 g solute

B. 80 g solute

C. 90 g solute

D. 100 g solute

• 70 g solute

• 80 g solute

• 90 g solute

• 100 g solute

Which of the following statements about water is NOT correct?

• Considered the universal solvent.

• Can act as an acid or a base in solution.

• Molecules are polar.

• Rare