Name: Physical and Chemical Changes Explained
Uploaded: 2019-07-19
Duration: 5 min 35 s
Description: Millions of changes happen around us. These changes can be physical changes or chemical changes. Do you know the difference between them? Learn how to distin...

Question

Tick the correct type of change corresponding to the following processes.

Process	Physical change	Chemical change
Evaporation of perfume on your skin
Burning of sugar
Melting of copper metal
Tearing a piece of aluminium foil
Fermentation
Condensation
Sublimation

Accepted Answer

Process Physical change Chemical change

Evaporation of perfume on your skin

Evaporation is the process of conversion of liquid into gas. No new substances are formed during this change, hence it is a physical change.

Process Physical change Chemical change

Burning of sugar

Burning of sugar releases carbon dioxide and other new substances that cannot be converted back to sugar. Therefore, the burning of sugar is a chemical change.

Process Physical change Chemical change

Melting of copper metal

When copper metal is melted, solid metal turns into liquid. It can be converted back to solid state by cooling. Since the change is reversible and no new substances are formed it is a physical change.

Process Physical change Chemical change

Tearing a piece of aluminium foil

Tearing of aluminium foil does not form any new substances, only shape and size of the foil changes. Therefore, it is a physical change.

Process Physical change Chemical change

Fermentation

Fermentation is the process of break down of a compound into simple substances in presence of bacteria. New substances are formed in this reaction. Therefore, fermentation is a chemical change.

Process Physical change Chemical change

Condensation

Condensation is the process of conversion of liquid into solid by cooling. No new substances will be formed during this change, hence it is a physical change.

Process Physical change Chemical change

Sublimation

Solids will be converted to gases directly in this change, since it does not form any new substance and therefore it is a physical change.

Archana Shukla Solutions for Chapter: Chemical Changes and Reactions, Exercise 8: WORKSHEET

Archana Shukla Science Solutions for Exercise - Archana Shukla Solutions for Chapter: Chemical Changes and Reactions, Exercise 8: WORKSHEET

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