Expert Chemistry Tutoring

Q1. Knowledge Recall (1 mark)

Define the term "concentration of a solution".

Q2. Application (2 marks)

Explain why a concentrated solution of sugar in water has a lower freezing point than pure water.

Q3. Calculation (2 marks)

Calculate the concentration of a solution containing 10 g of sodium chloride in 100 mL of water.

Q4. Knowledge Recall (2 marks)

State the units of concentration for the following methods:

- Percentage by mass

- Parts per million

Q5. Calculation (4 marks)

A 250 mL solution of sodium hydroxide has a concentration of 0.20 mol/dm³. Calculate the mass of sodium hydroxide present in the solution.

Q6. Application (3 marks)

Describe how a chemical equation can be used to calculate the concentration of a solution.

Q7. Calculation (3 marks)

A solution of sulfuric acid has a concentration of 0.10 mol/dm³. Calculate the volume of solution required to neutralize 20 mL of a 0.20 mol/dm³ solution of sodium hydroxide.

Q8. Knowledge Recall (1 mark)

Define the term "dilution".

Q9. Application (3 marks)

Explain the factors that affect the rate of diffusion of a solute in a solvent.

Q10. Calculation (4 marks)

A 50 mL sample of seawater contains 2.5 g of salt. Calculate the concentration of the seawater in parts per thousand.