Question

7. State four differences between physical and chemical changes.​

Answer 1

Answer:

chemical change is a permanent change. A Physical change affects only physical properties i.e. shape, size, etc. ... Some examples of physical change are freezing of water, melting of wax, boiling of water, etc. A few examples of chemical change are digestion of food, burning of coal, rusting, etc.

Explanation:

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Answer 2

Answer

Physical change

• No new substances with new properties are formed
• It can be reversed by simple physical methods.
• It is temporary change
• Energy is neither needed nor produced

 Chemical change

• New substance with new properties are formed.
• Change cannot be reversed by simple physical methods.
• It is permanent change
• Energy is either needed or evolved.