Question

All chemical changes are accompanied
by chemical reactions. These réactions
are described in sentence from with
the help of chemical equations in the term of symbol and formula of
the substance involved. initially the equation is
in skeletal form which is
then balanced so that
of the total
number the reactant
species is
is the same as that of
the product species. .
Why should a chemicael equation by balanced?
Can a chemical formula be changed during
the balancing of the equations?
Why are some chemical reactions
exothermic while some other are
endothermic
nature?
why should a chemical equation
be made malecular ?​

Answer 1

Answer:

1- A chemical equation should be balanced to satisfy law of conservation of mass.The total number of atoms in reactant must be equal to the total number of atoms in product

2- No , chemical formula do not changes during balancing equations , only the number of molecules of that particular compound changes.

3- A reaction is exothermic , if it evolves heat during the reaction and the reaction is called endothermic if the reaction absorbs or utilises the heat

4-Since not all elements have enough electrons to fill their outermost shells, atoms form chemical bonds with other atoms thereby obtaining the electrons they need to attain a stable electron configuration.Thus a chemical equation be made molecular