Chapter 2, Problem 1QAP

Atomic Theory and Laws

State in your own words the law of conservation of mass. State the law in its modern form.

Interpretation Introduction

Interpretation:

The law of conservation of mass should be stated in your words and in its modern form.

Concept introduction:

Dalton’s atomic theory explains that all matter composed of atoms, indestructible and indivisible building blocks and all the atoms of an element are identical.

It also explains that atoms of different elements vary in mass and size.

This atomic theory states that all the compounds contain combinations of atoms in definite ratios.

It also states the rearrangement of atoms in the product and reactant compounds is resulted by a chemical reaction.

Answer to Problem 1QAP

Law of conservation of mass states that the there is no change in the mass in a chemical reaction.

In modern form, the law of conservation of mass is the energy can neither be destroyed nor be created. It is always conserved.

Explanation of Solution

Three basic laws are explained by the Dalton’s atomic theory that is law of conservation of mass, law of constant proportions and law of multiple proportions.

Law of conservation of mass: This law states that during a reaction process or in a chemical reaction, there is no change in the mass of reactants or mass of reactant is equal to the mass of product.

In modern form, the energy or its form can neither be destroyed nor be formed is the law of conservation of mass. It is always conserved.

Conclusion

Law of conservation of mass states that the there is no change in the mass in a chemical reaction.

In modern form, the law of conservation of mass is the energy can neither be destroyed nor be created. It is always conserved.