Chapter 2, Problem 9A

Interpretation Introduction

Interpretation: With reference to the reaction of bromine with sodium metal whether it is physical or chemical property needs to be identified.

Concept introduction: All matters have physical and chemical properties that help in the identification of that particular matter.

Answer to Problem 9A

This represents a chemical property.

Explanation of Solution

Physical properties are those properties of matter which can be easily measured without change in the sample’s composition. For example, mass, color, and volume.

On the other hand, chemical properties can be defined as when a substance changed into new substances by chemical reaction which involves change in the composition of original substance. Examples are reactivity, flammability, and the ability to rust.

The reaction equation: $Na+Br\to NaBr$ .

As obvious, vigorous reaction of elemental bromine with elemental sodium represents chemical reactivity in which $Na$ donates one electron to $Br$ to form a completely new compound $NaBr$ having different properties.

Conclusion

This represents a chemical property.