Chapter U4.71, Problem 1E

Interpretation Introduction

Interpretation:

The law of conservation of mass must be explained.

Concept introduction:

Law of conservation of mass states that mass cannot be created or destroyed. It can only be converted to energy.

Answer to Problem 1E

Total mass of the universe is always constant.

Explanation of Solution

One substance can be converted to other in which arrangements of atoms, physical appearence and other properties might be different. But total mass before and after the change must be same. In some cases, some amount of mass can be converted to energy. For example in nuclear reaction some mass can be converted to binding ebnergy of the nucleus where protons and neutrons are there.

Conclusion

Mass doesn’t change in physical or chemical change. Total mass is always constant.