Ch3.9 Concentrations

What is the formula for calculating concentration of a solution?

• concentration = moles/volume

• concentration = density/volume

• concentration = mass/volume

• concentration = temperature/volume

What are the units for concentration?

• mol/dm3

• mol/mL

• g/cm3

• kg/L

What is the concentration of a solution with 0.5 moles of solute in 250 cm3 of solution?

• 0.005 mol/dm3

• 2 mol/dm3

• 0.2 mol/dm3

• 1 mol/dm3

Calculate the concentration of a solution with 2 moles of solute in 500 cm3 of solution.

• 0.5 mol/dm3

• 2 mol/dm3

• 1 mol/dm3

• 4 mol/dm3

How does volume affect the concentration of a solution?

• The concentration of the solution becomes more acidic

• The concentration of the solution remains the same

• The concentration of the solution decreases

• The concentration of the solution increases

If the concentration of a solution is 0.1 mol/dm3 and the volume is 100 cm3, how many moles of solute are present?

• 1 mole

• 0.001 moles

• 0.01 moles

• 10 moles

What is the relationship between concentration and moles of solute?

• Concentration is the amount of solute present in a given volume of solution, usually expressed in decimeters cubed (mol/dm3)

• Concentration is the measure of the temperature of the solution, usually expressed in degrees Celsius (°C) or Fahrenheit (°F).

• Concentration is the measure of the volume of solvent in a given volume of solution, usually expressed in liters per liter (L/L) or volume/volume.

• Concentration is the weight of solute present in a given volume of solution, usually expressed in grams per liter (g/L) or mass/volume.

Calculate the concentration of a solution with 4 moles of solute in 1 L of solution.

• 4 M

• 1 M

• 2 M

• 3 M

If the concentration of a solution is 0.2 mol/dm3 and the number of moles of solute is 0.4, what is the volume of the solution?

• 0.1 dm3

• 4 dm3

• 2 dm3

• 0.8 dm3

How does the number of moles of solute affect the concentration of a solution?

• The concentration of the solution increases

• The concentration of the solution decreases

• The concentration of the solution remains the same

• The concentration of the solution becomes more acidic