Chapter 2, Problem 2STP

Interpretation Introduction

Interpretation: An example of a physical change needs to be determined.

Concept Introduction: The nature of any substance is explained by their chemical properties and physical properties. A physical property describes the physical changes of a substance. Physical change is a temporary change; it is a reversible change. For example, color, mass, volume, etc.

Answer to Problem 2STP

Correct answer: Option C.

Explanation of Solution

Reason for correct option:

In the case of “sugar dissolving in coffee”, mixture of sugar & coffee retains their respective properties. Also, in this process no new substance is formed. In this process, substance may change its form, not identity. So, option C is a physical change.

Conclusion

Reasons for incorrect options:

Option A: This is a chemical change. So, this is an incorrect option.

Option B: This is a chemical change. So, this is an incorrect option.

Option D: This is a chemical change. So, this is an incorrect option.