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The Conservation of Matter

Description: Test your knowledge on the fundamental principle of the conservation of matter.
Number of Questions: 15
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Tags: chemistry matter conservation
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According to the law of conservation of mass, what remains constant in a chemical reaction?

  1. Mass of reactants

  2. Mass of products

  3. Total mass of reactants and products

  4. Volume of reactants

Show answer
Correct Option: C
Explanation:

The law of conservation of mass states that the total mass of the reactants in a chemical reaction is equal to the total mass of the products.

In a balanced chemical equation, the coefficients in front of the chemical formulas represent:

  1. The number of atoms of each element in the reaction

  2. The number of moles of each compound in the reaction

  3. The mass of each compound in the reaction

  4. The volume of each gas in the reaction

Show answer
Correct Option: B
Explanation:

In a balanced chemical equation, the coefficients represent the number of moles of each compound involved in the reaction.

What is the mass of the products formed when 10 g of methane (CH4) reacts completely with 20 g of oxygen (O2)?

  1. 10 g

  2. 20 g

  3. 30 g

  4. 40 g

Show answer
Correct Option: C
Explanation:

According to the law of conservation of mass, the total mass of the reactants (10 g CH4 + 20 g O2) is equal to the total mass of the products. Therefore, the mass of the products is 30 g.

In a chemical reaction, 5 moles of hydrogen gas (H2) react with 3 moles of oxygen gas (O2) to form water (H2O). How many moles of water are produced?

  1. 3 moles

  2. 5 moles

  3. 8 moles

  4. 10 moles

Show answer
Correct Option: D
Explanation:

According to the law of conservation of mass, the total number of moles of the reactants (5 moles H2 + 3 moles O2) is equal to the total number of moles of the products. Therefore, 10 moles of water are produced.

Which of the following statements is true about the conservation of matter?

  1. Matter can be created or destroyed in a chemical reaction.

  2. Matter can change from one form to another, but its total mass remains constant.

  3. The mass of the reactants in a chemical reaction is always greater than the mass of the products.

  4. The volume of the reactants in a chemical reaction is always less than the volume of the products.

Show answer
Correct Option: B
Explanation:

The law of conservation of mass states that matter cannot be created or destroyed, only transformed from one form to another.

In a nuclear reaction, mass is converted into energy according to the equation E=mc2. Does this violate the law of conservation of mass?

  1. Yes, because mass is being destroyed.

  2. No, because energy and mass are equivalent.

  3. It depends on the specific nuclear reaction.

  4. The law of conservation of mass does not apply to nuclear reactions.

Show answer
Correct Option: B
Explanation:

The law of conservation of mass is not violated in nuclear reactions because mass and energy are equivalent. The energy released in a nuclear reaction is equivalent to the mass that is lost.

Which of the following is an example of a physical change that does not involve a change in the composition of matter?

  1. Melting ice

  2. Burning wood

  3. Rusting iron

  4. Digesting food

Show answer
Correct Option: A
Explanation:

Melting ice is a physical change because the water molecules are simply changing from a solid state to a liquid state. The composition of the matter remains the same.

Which of the following is an example of a chemical change that involves a change in the composition of matter?

  1. Dissolving salt in water

  2. Boiling water

  3. Fermenting grapes

  4. Freezing water

Show answer
Correct Option: C
Explanation:

Fermenting grapes is a chemical change because the sugar molecules in the grapes are converted into alcohol and carbon dioxide molecules. The composition of the matter changes.

In a chemical reaction, the reactants are converted into products. What happens to the mass of the reactants?

  1. It is destroyed.

  2. It is created.

  3. It remains constant.

  4. It changes.

Show answer
Correct Option: C
Explanation:

According to the law of conservation of mass, the total mass of the reactants in a chemical reaction is equal to the total mass of the products. Therefore, the mass of the reactants remains constant.

What is the mass of the products formed when 20 g of sodium (Na) reacts completely with 35.5 g of chlorine (Cl2)?

  1. 20 g

  2. 35.5 g

  3. 55.5 g

  4. 71 g

Show answer
Correct Option: C
Explanation:

According to the law of conservation of mass, the total mass of the reactants (20 g Na + 35.5 g Cl2) is equal to the total mass of the products. Therefore, the mass of the products is 55.5 g.

In a chemical reaction, 4 moles of propane (C3H8) react completely with 13 moles of oxygen (O2) to form carbon dioxide (CO2) and water (H2O). How many moles of carbon dioxide are produced?

  1. 4 moles

  2. 6 moles

  3. 8 moles

  4. 10 moles

Show answer
Correct Option: B
Explanation:

According to the law of conservation of mass, the total number of moles of the reactants (4 moles C3H8 + 13 moles O2) is equal to the total number of moles of the products. Therefore, 6 moles of carbon dioxide are produced.

Which of the following statements is true about the conservation of matter?

  1. Matter can be created or destroyed in a chemical reaction.

  2. Matter can change from one form to another, but its total mass remains constant.

  3. The mass of the reactants in a chemical reaction is always greater than the mass of the products.

  4. The volume of the reactants in a chemical reaction is always less than the volume of the products.

Show answer
Correct Option: B
Explanation:

The law of conservation of mass states that matter cannot be created or destroyed, only transformed from one form to another.

In a nuclear reaction, mass is converted into energy according to the equation E=mc2. Does this violate the law of conservation of mass?

  1. Yes, because mass is being destroyed.

  2. No, because energy and mass are equivalent.

  3. It depends on the specific nuclear reaction.

  4. The law of conservation of mass does not apply to nuclear reactions.

Show answer
Correct Option: B
Explanation:

The law of conservation of mass is not violated in nuclear reactions because mass and energy are equivalent. The energy released in a nuclear reaction is equivalent to the mass that is lost.

Which of the following is an example of a physical change that does not involve a change in the composition of matter?

  1. Melting ice

  2. Burning wood

  3. Rusting iron

  4. Digesting food

Show answer
Correct Option: A
Explanation:

Melting ice is a physical change because the water molecules are simply changing from a solid state to a liquid state. The composition of the matter remains the same.

Which of the following is an example of a chemical change that involves a change in the composition of matter?

  1. Dissolving salt in water

  2. Boiling water

  3. Fermenting grapes

  4. Freezing water

Show answer
Correct Option: C
Explanation:

Fermenting grapes is a chemical change because the sugar molecules in the grapes are converted into alcohol and carbon dioxide molecules. The composition of the matter changes.

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