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Question: Which of the following statements is true?

Options:

  1. The total mass of the system remains same in a chemical change
  2. A chemical change is permanent and irreversible
  3. A physical change is temporary and reversible
  4. All of the above.

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1 Answer

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Best answer

4. All of the above

The statements;

  • The total mass of the system remains same in a chemical change
  • A chemical change is permanent and irreversible
  • A physical change is temporary and reversible
All are corrects.

More info:

According to the law of conservation of mass, the total mass of the system remains unchanged, also with a chemical change. The total mass of the products equals the total mass of the reactants.

Sometimes, other substances (reagents) to react with to form a new substance (product). This is a temporary change. However, when the reactant is fully converted into new products, and the chemical change takes place.

Therefore, a chemical change is permanent and irreversible while the physical change is temporary and reversible.

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