Question

Define chemical reaction which characteristic help you to know chemical reactions takes place

Answer 1

a chemical reaction is a change in which a substance gets converted into new substance followed by the following symptoms:-
1. change of state
2.change in color
3.change in temperature
4.evolution of gas
5.formation of precipitate

Answer 2

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In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.