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Test: Solutions and solubility - Year 8 MCQ


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10 Questions MCQ Test - Test: Solutions and solubility

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Test: Solutions and solubility - Question 1

Which of the following is a unit commonly used to express the concentration of a solution?

Detailed Solution for Test: Solutions and solubility - Question 1
Molarity (M) is defined as the number of moles of solute per liter of solution, which is a common way to express concentration.
Test: Solutions and solubility - Question 2

A solution has a concentration of 0.5 M. How many moles of solute are there in 2 liters of this solution?

Detailed Solution for Test: Solutions and solubility - Question 2

Concentration (M) = Moles of solute / Volume of solution (L).
Therefore, moles of solute = 0.5 M × 2 L = 1.0 mole.

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Test: Solutions and solubility - Question 3

Which factor does NOT affect the solubility of a substance?

Detailed Solution for Test: Solutions and solubility - Question 3
Solubility is primarily affected by temperature, pressure (for gases), and the nature of the solute and solvent. The volume of solvent affects the amount of solute that can be dissolved but not the solubility itself.
Test: Solutions and solubility - Question 4

What is the concentration of a solution if 5 grams of NaCl is dissolved in 250 mL of water? (Molar mass of NaCl = 58.5 g/mol)

Detailed Solution for Test: Solutions and solubility - Question 4

First, convert grams to moles: 5 g / 58.5 g/mol = 0.0855 mol.
Then, convert mL to L: 250 mL = 0.250 L.
Finally, use the formula M = moles/L: 0.0855 mol / 0.250 L = 0.342 M.

Test: Solutions and solubility - Question 5
When a saturated solution is cooled, what typically happens?
Detailed Solution for Test: Solutions and solubility - Question 5
Cooling a saturated solution typically causes the solute to precipitate out because solubility decreases with temperature for most solids.
Test: Solutions and solubility - Question 6
Which statement is true about a supersaturated solution?
Detailed Solution for Test: Solutions and solubility - Question 6
A supersaturated solution contains more solute than can normally dissolve at a given temperature, usually achieved by dissolving solute at high temperature and then cooling it carefully.
Test: Solutions and solubility - Question 7

Which factor typically increases the solubility of a solid solute in a liquid solvent?

Detailed Solution for Test: Solutions and solubility - Question 7

Increasing temperature generally increases the solubility of solid solutes in liquid solvents because it increases the kinetic energy of particles, allowing more collisions between solute and solvent molecules, which helps in overcoming intermolecular forces.

Test: Solutions and solubility - Question 8
How can you increase the rate at which a solute dissolves in a solvent?
Detailed Solution for Test: Solutions and solubility - Question 8
Stirring the solution increases the rate at which the solute dissolves by bringing fresh solvent into contact with the solute.
Test: Solutions and solubility - Question 9

Which of the following factors does NOT affect the rate of dissolution of a solute in a solvent?

Detailed Solution for Test: Solutions and solubility - Question 9

The volume of the solvent does not directly affect the rate of dissolution. Factors such as stirring/agitation, temperature, and surface area of the solute all influence how quickly a solute dissolves in a solvent by affecting the contact between solute and solvent particles.

Test: Solutions and solubility - Question 10

Which of the following substances is likely to dissolve best in water?

Detailed Solution for Test: Solutions and solubility - Question 10

Ionic solutes typically dissolve well in water due to the polar nature of water molecules, which can surround and stabilize ions through hydration. Non-polar solutes do not dissolve well in polar solvents like water, while polar and ionic solutes tend to dissolve more readily due to their ability to interact with water molecules.

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