why burning of candle is both physical and chemical change? any intelligent describe

Question

Answer

In a burning candle, there are both physical and chemical changes. The melting of the solid wax to form liquid wax and the evaporation of liquid wax to form wax vapour are physical changes. The burning of the wax vapour is a chemical change.

Answer

When a candle burns, both physical & chemical changes occur.Physical Changes in Burning Candle: On heating, candle wax melts and form liquid wax. It  is a physical change. Since it again turns into solid wax on cooling. This is a reversible change.Chemical Changes in Burning Candle: When you light the candle, the wax present near the wick will melt. Wick absorbs the liquid wax. The liquid wax vaporizes due the heat produced by the flame. This wax vapor near to flame burns and gives new substances like Carbon Dioxide, Carbon soot, water vapours, heat and light. This is an irreversible change.

Answer

Introduction: The burning of a candle is considered both a physical and chemical change. It involves various processes and reactions that can be categorized into these two types of changes.

Physical Change:
1. State Change: The solid wax of the candle undergoes a physical change when it is heated and melts into a liquid state. This change is purely physical as the composition and chemical properties of the wax remain the same.
2. Shape Change: As the candle burns, the shape of the wax changes due to the melting and dripping. This is another example of a physical change since the chemical composition of the wax is not altered.

Chemical Change:
1. Combustion Reaction: The burning of a candle involves a chemical reaction known as combustion. The heat from the flame vaporizes the liquid wax and the vapor combines with oxygen from the air to produce carbon dioxide and water vapor. This chemical reaction is represented by the equation:
Wax + Oxygen → Carbon Dioxide + Water Vapor + Heat
This reaction is irreversible, and it results in the formation of new substances with different chemical properties.
2. Energy Release: The burning of a candle is an exothermic process, which means that it releases heat and light energy. This energy is a result of the chemical reaction taking place within the candle. The energy released during combustion is what sustains the flame.

Conclusion:
In conclusion, the burning of a candle is both a physical and chemical change. The physical changes involve the state and shape of the wax, while the chemical changes involve the combustion reaction and energy release. These processes and reactions work together to create the mesmerizing flame and provide light and heat.

Similar Class 9 Doubts

Burning of a candle is an example of

Which of the following statement is correct?

Burning of candle is a physical or a chemical change ?

Burning of Paper is Physical Change or Chemical Change?

How burning of candle is a chemical change?

Top Courses for Class 9View all

Science Class 9

Social Studies (SST) Class 9

Mathematics (Maths) Class 9

English Class 9

English Grammar Advanced

Top Courses for Class 9

Top Courses for Class 9

Suggested Free Tests

Related Content

Class 9 Study Material

Class 9 Subjects

Competitive Examinations for Class 9

NCERT Books

NCERT Solutions

Reference Books for Class 9

Other Popular Exams

Company