Chemistry Concepts Quiz

What is the molarity of a solution if 0.5 moles of solute are dissolved in 2 liters of solution?

• 0.25 M
• 0.5 M
• 1.0 M
• 2.0 M

If a company wants to make a 0.15 M NaCl solution in a 250 mL bottle, how many grams of NaCl are needed? (Molar mass of NaCl = 58.44 g/mol)

• 2.20 g
• 2.20 kg
• 3.00 g
• 4.00 g

A swimming pool contains 30,000 liters of water. How much of a 10.0 M bleach solution is needed to achieve a final concentration of 0.025 M?

• 75 L
• 60 L
• 50 L
• 30 L

Which statement is true about a concentrated solution compared to a dilute solution?

• It has more solute particles.
• It has the same amount of solute.
• It has fewer solvent particles.
• It has a lower boiling point.

If you increase the concentration of a solution, what effect does it have on the rate of reaction?

• It decreases the rate.
• It has no effect.
• It increases the rate.
• It makes the reaction slower.

Which of the following solutions is likely to be unsaturated?

• A solution with 50 g of KCl in 100 g of water at 20°C.
• A solution with 100 g of KCl in 100 g of water at 20°C.
• A solution with 70 g of NaNO3 in 100 g of water at 10°C.
• A solution with 100 g of NaCl in 100 g of water at 25°C.

What happens to a saturated solution when it is cooled?

• More solute dissolves.
• Less solute dissolves.
• Some solute may crystallize out.
• It becomes unsaturated.

How much KCl can dissolve in 200 g of water at 60°C if the solubility is 40 g per 100 g of water?

• 80 g
• 60 g
• 40 g
• 20 g

If a solution contains 90 g of NaCl in 200 g of water at 25°C, is it saturated, unsaturated, or supersaturated?

• Saturated
• Unsaturated
• Supersaturated
• Not enough information

What is the effect of increasing temperature on the solubility of most solids in water?

• Solubility decreases.
• Solubility increases.
• No effect.
• Solubility becomes constant.