Question

What are physical change and chemical change give two example?

Answer 1

Changes in the Physical Properties of a Substance are known as Physical Changes. Physical Properties of a Substance include colour, size, shape, state, temperature, odour, appearance, texture and many more. In addition, Physical Changes do not lead to the formation of new substances. Physical Changes may or may not be reversible.

Examples of Physical Change

• Breaking/Crushing of any Object
• Expansion of Metal on Heating
• Dissolving Sugar or Salt (Solute) in Water (Solvent) (as a result, a solution is formed)
• Solidification of Molten Metal on Cooling
• Shredding Paper

Chemical Changes

One or more substances, at times, react with one another or substances which are readily available in the environment. This consequently leads to the formation of new substance(s). The formation of the new substance can also be accompanied by one or more of the following:

• Emission of Heat (Exothermic Reaction) as a result of a Chemical Changes
• Absorption of Heat (Endothermic Reaction) as a result of a Chemical Changes
• Emission Light as a result of a Chemical Changes
• Production of Sound as a result of a Chemical Changes
• Change or emission of Odour as a result of a Chemical Changes
• Emission of Gas as a result of a Chemical Changes
• and so on.

Examples of Chemical Change

• Rusting of Iron
• Souring of Milk
• Ripening of Fruits
• Digestion of Food
• Bursting of Crackers