What is define chemical reaction Fr points!!​

a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.

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Chemical reaction involves the use of products called reactant to get an acquired result

NB: Chemical reaction may involve the use of a catalyst to trigger the rate of the reaction.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante