Chapter 9.1, Problem 8SSC

Interpretation Introduction

Interpretation:

The three types of physical evidences that indicates the occurrence of a chemical reaction needs to be explained.

Concept introduction:

The process by which rearrangement of atoms of one or more substances occur to form different substances is termed as chemical reaction.

Answer to Problem 8SSC

The three indication of chemical change are temperature change, change of color and formation of gas.

Explanation of Solution

In many chemical reactions, some changes occurs, such as, change of temperature, this change of temperature indicates chemical reaction. In some chemical reactions, change of color is also observed. For example, keeping iron nails outside for some days makes these nails silver to orange brown. Another indication is formation of gas.

Conclusion

There are many indications of chemical change, such as, formation of solid, gas bubble, change of color, odor etc.