Which of the following statements is true?

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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 of the above

answer is D.

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Detailed Solution

Concept- Reactants are totally converted into products in a chemical process. The molecules in the reactants are combined to form new sets of molecules.
However, the total mass of the reactants and the mass of the products after the chemical reaction stay the same according to the principle of conservation of mass. A physical change involves a change in the reactants' and products' sizes, shapes, and materials. Even a material's phase transition falls under the category of physical changes. Physical changes imply that the material's molecular structure remains unchanged, but that the matter can take on any form depending on the circumstances. These changes are undoable.
Hence, option 4 is correct.

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