Q1. If 10 g of glucose (C6H12O6) is dissolved in 200 g of water, what is the mass percentage of the solution? (2023)
Solution:
Mass percentage = (mass of solute / mass of solution) x 100. Mass of solution = 10 g + 200 g = 210 g. Mass percentage = (10 g / 210 g) x 100 = 4.76%.
⏱ Time: 0s
Q2. What is the effect of increasing the temperature on the solubility of most solid solutes in water? (2023)
Solution:
For most solid solutes, increasing the temperature increases their solubility in water.
⏱ Time: 0s
Q3. How many grams of KCl are needed to prepare 250 mL of a 2 M solution? (2023)
Solution:
Molar mass of KCl = 74.55 g/mol. Grams = moles × molar mass = 0.5 moles × 74.55 g/mol = 37.25 g.
⏱ Time: 0s
Q4. What is the mass of NaOH required to prepare 0.5 L of a 1 M solution? (2023)
Solution:
Molar mass of NaOH = 40 g/mol; grams = moles × molar mass = (1 mole/L × 0.5 L) × 40 g/mol = 20 g
⏱ Time: 0s
Q5. What is the term for a solution that contains the maximum amount of solute that can dissolve at a given temperature? (2022)
Solution:
A saturated solution is one that contains the maximum amount of solute that can dissolve at a specific temperature.
⏱ Time: 0s
Q6. Which of the following solutions has the highest freezing point? (2020)
Solution:
0.1 M glucose is a non-electrolyte and does not dissociate, thus it has the highest freezing point compared to the ionic solutions.
⏱ Time: 0s
Q7. If 10 g of sugar (C12H22O11) is dissolved in 200 g of water, what is the mass percentage of the solution? (Molar mass of sugar = 342 g/mol) (2023)
Solution:
Mass percentage = (mass of solute / mass of solution) x 100. Mass of solution = 10 g + 200 g = 210 g. Mass percentage = (10 g / 210 g) x 100 = 4.76%.
⏱ Time: 0s
Q8. If 10 g of sugar (C12H22O11) is dissolved in 200 g of water, what is the mass percentage of the sugar solution? (Molar mass of sugar = 342 g/mol) (2023)
Solution:
Mass percentage = (mass of solute / mass of solution) x 100. Mass of solution = 10 g + 200 g = 210 g. Mass percentage = (10 g / 210 g) x 100 = 4.76%.
⏱ Time: 0s
Q9. What is the molarity of a solution containing 5 moles of solute in 2 liters of solution? (2021) 2021
Solution:
Molarity (M) = moles of solute / liters of solution = 5 moles / 2 L = 2.5 M.
⏱ Time: 0s
Q10. What is the effect of temperature on the solubility of most solid solutes in water? (2023)
Solution:
For most solid solutes, solubility increases with an increase in temperature.
