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Question (1)

QN007161

The Law of Conservation of Mass states that during a chemical reaction:

(A) Mass can be created
(B) Mass can be destroyed
(C) Total mass remains constant
(D) Volume always remains constant

Correct Answer: C

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Question (2)

QN007162

Who proposed the Law of Conservation of Mass in 1789?

(A) John Dalton
(B) Joseph Proust
(C) Antoine Lavoisier
(D) Rutherford

Correct Answer: C

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Question (3)

QN007163

In Activity 9.1, salt dissolved in water showed that:

(A) Mass decreases during physical change
(B) Mass increases during physical change
(C) Mass remains practically unchanged
(D) Salt disappears completely

Correct Answer: C

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Question (4)

QN007164

When baking soda reacts with vinegar in an open flask, the measured mass decreases because:

(A) Matter is destroyed
(B) Vinegar evaporates completely
(C) Carbon dioxide escapes into air
(D) Baking soda changes into liquid

Correct Answer: C

Explanation:

Carbon dioxide gas escapes from the open flask.

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Question (5)

QN007165

In a closed experimental setup involving vinegar and baking soda, the initial and final masses are nearly equal because:

(A) No reaction occurs
(B) Gas produced remains trapped
(C) Vinegar becomes solid
(D) Mass is created inside the flask

Correct Answer: B

Explanation:

Gas remains inside the closed system.

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Question (6)

QN007166

Which statement best represents Lavoisier’s conclusion?

(A) Matter can be converted into energy only
(B) Equal quantity of matter exists before and after a reaction
(C) Matter always changes colour during reaction
(D) Gases have no mass

Correct Answer: B

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Question (7)

QN007167

Which of the following is a chemical change used to verify conservation of mass?

(A) Tearing paper
(B) Dissolving salt in water
(C) Mixing sodium sulfate and barium chloride solutions
(D) Melting wax

Correct Answer: C

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Question (8)

QN007168

In the reaction between sodium sulfate and barium chloride, the white precipitate formed is:

(A) Sodium chloride
(B) Barium sulfate
(C) Sulfur dioxide
(D) Calcium sulfate

Correct Answer: B

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Question (9)

QN007169

If 12 g of carbon combines with 32 g of oxygen, the mass of carbon dioxide formed is:

(A) 20 g
(B) 32 g
(C) 44 g
(D) 56 g

Correct Answer: C

Explanation:

By conservation of mass, 12 + 32 = 44 g.

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Question (10)

QN007170

If 6 g of carbon reacts completely with oxygen according to the reaction forming carbon dioxide, the mass of CO₂ formed will be:

(A) 11 g
(B) 22 g
(C) 44 g
(D) 88 g

Correct Answer: B

Explanation:

12 g carbon forms 44 g CO₂, so 6 g forms 22 g.

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Question (1)

The Law of Conservation of Mass states that during a chemical reaction:

Explanation:

Link:

Question (2)

Who proposed the Law of Conservation of Mass in 1789?

Explanation:

Link:

Question (3)

In Activity 9.1, salt dissolved in water showed that:

Explanation:

Link:

Question (4)

When baking soda reacts with vinegar in an open flask, the measured mass decreases because:

Explanation:

Link:

Question (5)

In a closed experimental setup involving vinegar and baking soda, the initial and final masses are nearly equal because:

Explanation:

Link:

Question (6)

Which statement best represents Lavoisier’s conclusion?

Explanation:

Link:

Question (7)

Which of the following is a chemical change used to verify conservation of mass?

Explanation:

Link:

Question (8)

In the reaction between sodium sulfate and barium chloride, the white precipitate formed is:

Explanation:

Link:

Question (9)

If 12 g of carbon combines with 32 g of oxygen, the mass of carbon dioxide formed is:

Explanation:

Link:

Question (10)

If 6 g of carbon reacts completely with oxygen according to the reaction forming carbon dioxide, the mass of CO₂ formed will be:

Explanation:

Link:

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