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What is a physical changes and …

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What is a physical changes and chemical changes give two example of physical changes and two example of chemical changes

Posted by Purv Patel 1 year, 5 months ago

CBSE > Class 07 > Science

2 answers

Preeti Dabral 1 year, 5 months ago

A change in which the molecules are rearranged, but their internal composition remains same is called Physical Change. A process in which the substance transforms into a new substance, having a different chemical composition, it is known as Chemical Change.
Some common examples of physical change vaporisation, condensation, freezing/melting/boiling of water. On the contrary, the examples of chemical change are combustion, metabolism, cooking of egg, etc.
Physical change is a temporary; they are easily reversible. As against this, the chemical change is permanent in nature, i.e. they cannot be reversed, even by reversing conditions.
In the physical change, only the form of the substance is changed, but no new product is formed. On the other hand, when there is a chemical reaction, a completely different product is formed, whose properties are completely different from that of the reacting substances.
In a physical change, the original matter can be recovered, by simple physical methods. As opposed, in chemical change the original matter no longer exist, and so it cannot be recovered.
In the physical change, change in the physical attributes of the substance is observed, such as shape, size, appearance, texture, odour, density and so on. Conversely, chemical change involves the change in chemical properties of the substance, i.e. change in its chemical nature.
In the physical change, no or very little amount of energy is absorbed or given out as heat, light or sound energy. Unlike chemical change, wherein enormous energy is absorbed or given out as heat, light or sound energy

Kadari Harshith 1 year, 5 months ago

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