4. What is a change ? Explain with the help of suitable example.
What is a chemical reaction ? Explain with an example.
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A change is something which change due to some external or internal factors , man-made or natural factors , etc . example- water turning into vapour due to heat provided .
A chemical reaction is a type of reaction when two or more elements or compounds react by giving, receiving or sharing electron to complete their octet .
eg reaction of Na(Sodium) with Cl(Chlorine) to form NaCl ( Sodium Chloride/ Common Salt )
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