How can you classify chemical change and physical change?
Class 7
Answers
Answer:
In physical change no new substance is formed. For example-
sugar dissolving in water and sharpening of a pencil.
In this sugar is sweet in taste as well as water in which sugar is dissolved is also sweet in taste therefore no new substance is formed so it is a physical change.
In the other other example of sharpening of a pencil when we sharp a pencil the pencil remains pencil only only size changes not the substance therefore if no new substance is formed so it is a physical change.
In chemical changes a new substance is formed.
For example-
Burning of a paper
If we burn paper it converts to ash, it is a new substance formed, therefore of a new substance is formed so it is a chemical change
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Answer:
(i) Physical change -In a physical change no new substance is formed. Example - sublimation. (ii) Chemical change - In a chemical change one or more new substance are formed