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Question (1)

QN0029213

A student dissolves 20 g of sugar in 80 g of water. Which component is the solvent?

(A) Sugar
(B) Water
(C) Solution
(D) Crystal

Correct Answer: B

Explanation:

The substance present in larger amount and doing the dissolving is the solvent.

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Question (2)

QN0029214

A solution contains 15 g salt and 135 g water. What is the total mass of the solution?

(A) 120 g
(B) 135 g
(C) 140 g
(D) 150 g

Correct Answer: D

Explanation:

Mass of solution = Mass of solute + Mass of solvent = 15 + 135 = 150 g.

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Question (3)

QN0029215

Which statement is correct for a saturated solution at a given temperature?

(A) It can dissolve unlimited solute.
(B) It cannot dissolve any more solute under the same conditions.
(C) It contains only solvent.
(D) It contains only solute.

Correct Answer: B

Explanation:

A saturated solution has dissolved the maximum possible solute.

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Question (4)

QN0029216

A student adds 25 g of a substance to 100 g water. Only 18 g dissolves. The undissolved amount is:

(A) 5 g
(B) 6 g
(C) 7 g
(D) 8 g

Correct Answer: C

Explanation:

Undissolved amount = 25 − 18 = 7 g.

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Question (5)

QN0029217

Which factor generally increases the solubility of most solid solutes in water?

(A) Increasing temperature
(B) Decreasing temperature
(C) Reducing solvent amount to zero
(D) Removing the solvent

Correct Answer: A

Explanation:

Most solids dissolve better at higher temperatures.

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Question (6)

QN0029218

A gas-filled cold drink bottle is kept in the refrigerator. Why does it retain more dissolved gas?

(A) Gas solubility increases at lower temperature
(B) Gas solubility decreases at lower temperature
(C) Sugar becomes insoluble
(D) Water evaporates faster

Correct Answer: A

Explanation:

Gases are generally more soluble in liquids at lower temperatures.

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Question (7)

QN0029219

A water sample contains 14 mg/L dissolved oxygen. Another sample contains 10 mg/L. How much more oxygen does the first sample contain?

(A) 2 mg/L
(B) 3 mg/L
(C) 4 mg/L
(D) 5 mg/L

Correct Answer: C

Explanation:

14 − 10 = 4 mg/L.

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Question (8)

QN0029220

A substance has a mass of 180 g and occupies 90 cm³. What is its density?

(A) 1 g/cm³
(B) 1.5 g/cm³
(C) 2 g/cm³
(D) 3 g/cm³

Correct Answer: C

Explanation:

Density = Mass ÷ Volume = 180 ÷ 90 = 2 g/cm³.

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Question (9)

QN0029221

A block has density 0.75 g/cm³. What is its most likely behavior in water?

(A) Sink
(B) Float
(C) Dissolve
(D) Evaporate

Correct Answer: B

Explanation:

Density less than water means the object floats.

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Question (10)

QN0029222

A student prepares a solution by mixing 12 g solute with 108 g solvent. What percentage of the solution mass is solute?

(A) 8%
(B) 10%
(C) 12%
(D) 15%

Correct Answer: B

Explanation:

Total mass = 120 g; (12/120) × 100 = 10%.

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Question (1)

A student dissolves 20 g of sugar in 80 g of water. Which component is the solvent?

Explanation:

Link:

Question (2)

A solution contains 15 g salt and 135 g water. What is the total mass of the solution?

Explanation:

Link:

Question (3)

Which statement is correct for a saturated solution at a given temperature?

Explanation:

Link:

Question (4)

A student adds 25 g of a substance to 100 g water. Only 18 g dissolves. The undissolved amount is:

Explanation:

Link:

Question (5)

Which factor generally increases the solubility of most solid solutes in water?

Explanation:

Link:

Question (6)

A gas-filled cold drink bottle is kept in the refrigerator. Why does it retain more dissolved gas?

Explanation:

Link:

Question (7)

A water sample contains 14 mg/L dissolved oxygen. Another sample contains 10 mg/L. How much more oxygen does the first sample contain?

Explanation:

Link:

Question (8)

A substance has a mass of 180 g and occupies 90 cm³. What is its density?

Explanation:

Link:

Question (9)

A block has density 0.75 g/cm³. What is its most likely behavior in water?

Explanation:

Link:

Question (10)

A student prepares a solution by mixing 12 g solute with 108 g solvent. What percentage of the solution mass is solute?

Explanation:

Link:

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