Question

Define physical and chemical change with examples​​

Answer 1

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Physical Change - ⠀Physical Change can be defined as a change which occurs in physical properties of an object. These types of changes are reversible. Usually, in this change a new substance is formed. It includes changes in size and shape.

Chemical Change - ⠀Chemical change can be defined as a change in which two or more than two substances combines with each other to form a new substance often known as Chemical Synthesis. These types of changes are irreversible.

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Physical Change —

• Boiling.

• Freezing.

• Melting.

• Frost formation.

• Condensation.

Chemical Change —

• Rusting of iron.

• Burning of paper.

• Food digestion.

• Combustion.

• Cooking of food.

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Answer 2

Answer:

Chemical Change

A chemical change is a type of change where the chemical properties of matter change. It is commonly called a chemical reaction.

Different substances have different chemical property. According to this property, substances show variation in their reactivity. A chemical reaction results in a new product. During a chemical change, bonds between the molecules break and the composition of the substance change. In other words, chemical change leads to the breaking and making of bonds.

Examples of Chemical Change

Combustion, rusting, fermentation, etc. are a few examples of chemical change.

Physical Change

When matter changes its observable properties, we can say it has undergone a physical change.

Physical change is a type of change where the physical properties of matter change. A change of state of matter, change in colour, odour, solubility, etc. all are examples of physical change.

During a physical change, neither the composition nor the chemical nature of matter is changed.  During this change, molecules rearrange themselves without affecting the internal composition. A physical change doesn’t affect the chemical property.