Question

"we need to balance a skeletal chemical equation" give reason to justify the statement
2) giving an example list two information which make a chemical equation more useful (informative) ​

Answer 1

We need to maintain the law of conservation of mass that says that mass cannot be gained or reduced in a chemical reaction. Reduction of atoms will oppose this law and hence we need to balance the number of atoms of each element on both the sides

Information that makes a chemical reaction useful is:

1)State of elements or compounds.

The first letter of the state of matter is denoted within brackets in the subscript.

Ex. 2Mg(s)+ O2(g) gives 2MgO(s).

2)Conditions:

Heat

Pressure

Catalyst

Ex. 2Mg+ O2+ heat gives 2MgO

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