Question

3. Write three differences between physical
changes and chemical changes.​

Answer 1

Answer:

a 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

Answer 2

$\huge\sf\underline{\underline{☆Answer}}$

$\mathfrak\blue{Chemical \: Changes:}$

☆The Molecules of the original substances undergo changes to form molecules of new substances are called Chemical changes.

☆A chemical change occurs when there is a chemical reaction between the substances.

☆In a chemical reaction,tge initial substances react with each other to form new substances.

$\mathfrak\blue{physical \: Changes:}$

☆The molecules of the substance remain exactly the same before and after the change.Such changes are called Physical Changes.

☆Most physical changes are reversible.

☆Some physical changes such as tearing of paper or changing size of a pencil with use cannot be reversed.

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