Unit 12 Review (2021)

Unit 12 Review (2021)

Open Ended

What type of solution is this and why?

Open Ended

What type of solution is this and why?

Multiple Choice

50 g of NaCl / 100 g of water in a 90 degree Celsius solution is...

• Supersaturated

• Saturated

• Unsaturated

Multiple Choice

Which of the following is a saturated solution?

• 120 g of KI at 10 degrees

• 100 g of NaCl at 20 degrees

• 90 grams of NaNO₃ at 90 degrees

• 10 g of SO₂ at 20 degrees

Multiple Choice

60 g of KCl per 100 g of water at 90 degrees is...

• Supersaturated

• Saturated

• Unsaturated

Multiple Choice

What is a correct example of a difference between a solvent and a solute?

• Solvent = water; solute = gatorade powder

• Solvent = gatorade powder; solute = water

Open Ended

Think back to the supersaturation lab and explain how we got a supersaturated solution. What did you (Mr. Ashton) keep doing to the test tube.

Adding more solute....

.... more and more saturated

Calculating Molarity

M = mol / volume

Multiple Choice

What is the Molarity of a 0.1 L solution of 0.1 mol of NH3?

• 0.1 M

• 0.01 M

• 1.0 M

• 10 M

Multiple Choice

What is the Molarity of a 150 mL solution of 0.1 mol of NH₃?

• 0.1 M

• 1.0 M

• 1.5 M

• 15 M

If you are given grams instead of mol, be sure to go from "grams --> mol" first.

• Divide by the molar mass.

• 10 grams of NH3 // (17.04) = 0.58 mol

Multiple Choice

What is the molarity of 20 grams of NH₃ in a 200 mL solution?

• 5.87 M

• 0.1 M

• 0.005 M

• 1.7 M

Multiple Choice

You have 500 mL of a 2.0 M solution of HCl. What is the number of mol of HCl in solution?

• 0.25 mol

• 1.0 mol

• 1000 mol

• 25 mol