Which of the following statements is true?

Question

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.

Answer 1

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.

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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.