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Chapter 1: Q28 E (page 56)

Classify each of the following changes as physical or chemical:

(a) coal burning

(b) ice melting

(c) mixing chocolate syrup with milk

(d) explosion of a firecracker

(e) magnetizing of a screwdriver

Short Answer

Expert verified
  1. Chemical
  2. Physical
  3. Physical
  4. Chemical
  5. Physical

Step by step solution

01

Understanding what is physical and chemical change

Physical change is a type of change in which physical structure changes but chemical composition does not change.

Chemical change is a change in which chemical composition of a substance changes.

02

Analyzing each phenomenon individually

  1. Coal burns in air which effects its chemical composition which cannot be reversed. So, it is chemical change.
  2. It is a physical change as its chemical composition does not change,
  3. Chemical composition is not changed, so it is a physical change.
  4. Elements used in firecrackers reacts with oxygen and its chemical composition changes. So, it is a chemical change.
  5. It is a physical change as chemical composition is not changed.

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