AP Chemistry Unit 3 Section 7 Quiz

Which of the following is an example of a heterogeneous mixture?

• Salad

• Brass

• Saltwater

• Air

What is a key characteristic of homogeneous mixtures?

• They contain only one substance

• Components are visible to the naked eye

• Components are uniformly distributed

• They are always liquids

Which of the following is NOT a unit of concentration?

• Normality

• Density

• Molality

• Molarity

How is molarity calculated?

• Moles of solute divided by liters of solution

• Grams of solute divided by liters of solvent

• Grams of solute divided by moles of solution

• Liters of solute divided by moles of solvent

If you have 0.711 grams of tin(II) chloride in 75.0 mL of solution, what is the molarity?

• 0.0500 M

• 0.0750 M

• 0.1000 M

• 0.0250 M

What is the first step in calculating the molarity of a solution?

• Convert grams to liters

• Convert grams to moles

• Convert liters to moles

• Convert moles to grams

In a dilution problem, what should you never do?

• Add acid to water

• Add water to acid

• Use the dilution equation

• Convert milliliters to liters

What is the dilution equation used for?

• Measuring the temperature change in a reaction

• Determining the pH of a solution

• Calculating the density of a solution

• Finding the volume of a concentrated solution needed to make a dilute solution

If you need to prepare 500 mL of 0.250 M HCl from a 12.0 M stock solution, how much stock solution is required?

• 15.6 mL

• 10.4 mL

• 20.8 mL

• 5.2 mL

What does the term 'molarity' refer to in chemistry?

• The mass of solute in a solution

• The volume of solvent in a solution

• The number of moles of solute per liter of solution

• The density of a solution