Unit 7 review-Molarity and Solubility

What is the molarity of a solution prepared by dissolving 14.2g of NaNO3 (molar mass = 85.0g/mol) in 350mL of  solution? 

Molarity= moles/liters

• 0.0405 M 

• 40.57 M

• 0.477 M

• 0.0005 M

 ____ ions are associated with bases just as _____ ions are associated with acids.  

• Hydroxide, Hydroxide

• Hydroxide, Hydronium

• Hydronium, Hydronium

• Hydronium, Hydroxide

How would a solution with a pH of 9.2 be classified?

• Base

• Neutral

• Acid

• The solution cannot be classified

The temperature of an ideal gas is raised from 135K to 270K, while the pressure remains constant. Which  statement correctly identifies what happens to the volume?

• Remains the same

• Doubles in size

• Shrinks to ½ the original volume

•  Increases by a factor of 10

For a fixed amount of gas at a constant temperature, how does the pressure change as volume increases?

• Increases, then decreases

• Remains the same

• Decreases

• Increases

Which of the two flasks – Flask 1 or Flask 2 – has the higher molarity? Assume both flasks  have the same amount of solvent.

• Flask 1, because it has more moles of solute per liter of solvent than Flask 2.

• Flask 2, because it has more moles of solute per liter of solvent than Flask 1

• Flask 1, because it has fewer moles of solute per liter of solvent than Flask 2

• Flask 2, because it has fewer moles of solute per liter of solvent than Flask 1

Tags

NGSS.HS-PS1-5

Which of the following best describes a weak base? 

•  A base with a pH lower than 3.

• A dilute strong base

• A base with a very low concentration

• A base that dissociates very slightly in a water solution

If a cube of sugar is crushed before being added to a cup of coffee, how is the solubility affected?

•  Crushing does not increase the temperature of the solution; therefore, solubility is not  affected. 

• Crushing the sugar cube increases the surface area, therefore solubility is increased.

• Crushing the sugar cube reduces the surface area, therefore solubility is increased

• Crushing the sugar cube decreases the temperature of the solution, there solubility is  increased. 

A solute is added to water and a small amount of that solute remains undissolved. What kind of  solution is this?

•  Saturated

• Diluted

• Supersaturated

• Unsaturated

How many moles of KNO3 must be dissolved in water to make 1.5 L of a 2.0 M solution?

• 1.3 mol KNO3

• .75 mol KNO3

• 1 mol KNO3

• 3 mol KNO3