Question

what is a chemical reaction? give one example give 2 charactersitics of chemical reaction​

Answer 1

Answer :-

Chemical Reaction→ The reaction in which two or more reactant react together to form a new substance under some suitable conditions is called chemical reaction.

In a chemical reaction the substance which undergoes reaction is called reactant and the substance produced is called products.

Ex:- $Na + H_2O → NaOH + H_2↑$

Characterstics of a chemical reaction are :-

• Chemical reaction always accompanied with evolution and absorption of heat energy.

• Chemical reaction leads to the formation of a new substance having different properties.

• Chemical reaction is the arrangement and breaking of bonds.

Chemical reaction is always balanced to follow the law of conservation of mass.

Answer 2

chemical reaction

the reaction in which one or more reactants combines or reacts to form products (new substance ) are called chemical reaction .

Mg+O -----> MgO

change in colour and temperature.

formation of precipitate..