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Question (11)

QN0029223

Which of the following is an example of a gas dissolved in a liquid?

(A) Salt in water
(B) Sugar in milk
(C) Carbon dioxide in soda water
(D) Sand in water

Correct Answer: C

Explanation:

Carbonated drinks contain dissolved carbon dioxide.

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Question (12)

QN0029224

A substance has density 1.4 g/cm³. Compared with water, it is:

(A) Less dense
(B) Equally dense
(C) More dense
(D) Density cannot be compared

Correct Answer: C

Explanation:

Water has a density of about 1 g/cm³.

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Question (13)

QN0029225

A saturated solution contains 40 g dissolved solute in 100 g water. If 10 g more solute is added at the same temperature, what happens?

(A) All dissolves
(B) Density becomes zero
(C) Extra solute remains undissolved
(D) Water disappears

Correct Answer: C

Explanation:

Saturated solutions cannot dissolve more solute at the same temperature.

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Question (14)

QN0029226

A metal piece has mass 320 g and density 4 g/cm³. Its volume is:

(A) 60 cm³
(B) 70 cm³
(C) 80 cm³
(D) 90 cm³

Correct Answer: C

Explanation:

Volume = Mass ÷ Density = 320 ÷ 4 = 80 cm³.

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Question (15)

QN0029227

Fish are more comfortable in cooler water mainly because:

(A) Cool water contains more dissolved oxygen
(B) Cool water contains less oxygen
(C) Water becomes solid
(D) Salt dissolves faster

Correct Answer: A

Explanation:

Dissolved oxygen increases as temperature decreases.

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Question (16)

QN0029228

A solution has a total mass of 250 g. If solvent mass is 200 g, the solute mass is:

(A) 40 g
(B) 45 g
(C) 50 g
(D) 55 g

Correct Answer: C

Explanation:

Solute mass = 250 − 200 = 50 g.

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Question (17)

QN0029229

An object has mass 150 g and volume 300 cm³. What is its density?

(A) 0.25 g/cm³
(B) 0.5 g/cm³
(C) 1 g/cm³
(D) 2 g/cm³

Correct Answer: B

Explanation:

Density = 150 ÷ 300 = 0.5 g/cm³.

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Question (18)

QN0029230

Which statement best explains why a large ship floats?

(A) It has a bright colour
(B) Its average density is less than that of water
(C) It is made only of metal
(D) It has powerful engines

Correct Answer: B

Explanation:

Floating depends on average density.

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Question (19)

QN0029231

A bottle contains 30 units of dissolved carbon dioxide. After opening, 8 units escape. How many units remain dissolved?

(A) 20
(B) 22
(C) 24
(D) 28

Correct Answer: B

Explanation:

30 − 8 = 22 units.

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Question (20)

QN0029232

A material occupies 240 cm³ and has a mass of 360 g. Which statement is correct?

(A) Density = 0.67 g/cm³; likely floats in water
(B) Density = 1.5 g/cm³; likely sinks in water
(C) Density = 2.0 g/cm³; likely floats in water
(D) Density = 3.0 g/cm³; likely remains suspended

Correct Answer: B

Explanation:

Density = 360 ÷ 240 = 1.5 g/cm³, which is greater than water, so it sinks.

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Question (11)

Which of the following is an example of a gas dissolved in a liquid?

Explanation:

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Question (12)

A substance has density 1.4 g/cm³. Compared with water, it is:

Explanation:

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Question (13)

A saturated solution contains 40 g dissolved solute in 100 g water. If 10 g more solute is added at the same temperature, what happens?

Explanation:

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Question (14)

A metal piece has mass 320 g and density 4 g/cm³. Its volume is:

Explanation:

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Question (15)

Fish are more comfortable in cooler water mainly because:

Explanation:

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Question (16)

A solution has a total mass of 250 g. If solvent mass is 200 g, the solute mass is:

Explanation:

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Question (17)

An object has mass 150 g and volume 300 cm³. What is its density?

Explanation:

Link:

Question (18)

Which statement best explains why a large ship floats?

Explanation:

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Question (19)

A bottle contains 30 units of dissolved carbon dioxide. After opening, 8 units escape. How many units remain dissolved?

Explanation:

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Question (20)

A material occupies 240 cm³ and has a mass of 360 g. Which statement is correct?

Explanation:

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