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MCQs — Matter

Practice questions for Chemistry.

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Question 61

What does dynamic equilibrium in a saturated solution mean?

A. No solute is dissolving or crystallizing at all

B. All of the solute has dissolved completely

C. The rate of solute dissolving equals the rate of solute crystallizing back out

D. The solution has stopped being a mixture

Question 62

Sugar is added to a cup of tea until no more will dissolve, and extra sugar settles at the bottom. This tea is now a:

A. Saturated solution

B. Unsaturated solution

C. Dilute solution

D. Pure compound

Question 63

A solution that can still dissolve more solute at a given temperature is called an:

A. Saturated solution

B. Unsaturated solution

C. Supersaturated solution

D. Concentrated solution

Question 64

Why can more solute be added to an unsaturated solution without any left undissolved?

A. The solvent has already dissolved the maximum amount possible

B. The solute has turned into a gas

C. The solution has become supersaturated

D. The solvent has not yet reached its maximum capacity to dissolve solute at that temperature

Question 65

A glass of water has a small amount of salt dissolved in it, and much more salt could still dissolve without any settling at the bottom. This solution is:

A. Unsaturated

B. Saturated

C. Supersaturated

D. Concentrated but full

Question 66

A chemist adds solute to a solution and it all dissolves completely with no residue. Compared to a saturated solution at the same temperature, this solution most likely contains:

A. More solute than the maximum amount possible

B. Exactly the maximum amount possible

C. Less solute than the maximum amount possible

D. No solute at all

Question 67

How does an unsaturated solution differ from a saturated solution?

A. An unsaturated solution has already reached its limit, while a saturated solution can dissolve more

B. An unsaturated solution can dissolve more solute, while a saturated solution has already reached its solubility limit

C. They are exactly the same type of solution

D. An unsaturated solution contains no solvent

Question 68

A solution that contains more dissolved solute than it normally could hold at a given temperature is called a:

A. Supersaturated solution

B. Saturated solution

C. Unsaturated solution

D. Dilute solution

Question 69

How are supersaturated solutions usually formed?

A. By adding cold solvent to a saturated solution

B. By removing all the solute from a solution

C. By boiling the solution until it becomes dry

D. By dissolving solute in a hot solvent and then slowly cooling it without disturbance

Question 70

A supersaturated solution is generally described as:

A. Completely stable under all conditions

B. Unable to hold any solute at all

C. Unstable, and likely to release extra solute as crystals if disturbed

D. Always a gas at room temperature

Question 71

The process in which excess dissolved solute separates out of a supersaturated solution to form solid crystals is called:

A. Evaporation

B. Sublimation

C. Condensation

D. Crystallization

Question 72

A rock candy stick is dropped into a sugar solution, and sugar crystals rapidly begin forming on it. This solution was most likely:

A. Unsaturated

B. A pure compound

C. Supersaturated

D. A gaseous solution

Question 73

A solution that contains a relatively large amount of solute compared to the solvent is called a:

A. Concentrated solution

B. Dilute solution

C. Unsaturated solution

D. Pure solvent

Question 74

A solution that contains a relatively small amount of solute compared to the solvent is called a:

A. Concentrated solution

B. Dilute solution

C. Saturated solution

D. Pure solute

Question 75

How does a concentrated solution differ from a dilute solution?

A. A concentrated solution has no solute at all

B. A dilute solution always has more solute than a concentrated one

C. They are exactly the same type of solution

D. A concentrated solution has a higher proportion of solute to solvent than a dilute solution

Question 76

Is a saturated solution always concentrated? Why or why not?

A. Not necessarily, because saturation depends on solubility limits, which vary by solute and temperature

B. Yes, every saturated solution must always be highly concentrated

C. No, a saturated solution never contains much solute

D. Yes, because saturation and concentration mean exactly the same thing

Question 77

A glass of juice made by mixing a small spoon of juice powder into a large jug of water would be described as:

A. Concentrated

B. Dilute

C. Saturated

D. Supersaturated

Question 78

A glass of juice made by mixing many spoons of juice powder into a small glass of water would be described as:

A. Dilute

B. Pure solvent

C. Concentrated

D. A suspension

Question 79

The maximum amount of a solute that can dissolve in a given amount of solvent at a specific temperature is called its:

A. Solubility

B. Density

C. Concentration only

D. Viscosity

Question 80

For most solid solutes dissolved in a liquid, increasing the temperature usually:

A. Decreases their solubility

B. Has no effect on solubility

C. Turns them into a gas

D. Increases their solubility

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