state whether the following statement is true or false:-
"chemical equations can be balanced easily by altering the formulae of the substances evolved"

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Solution

This statement is False.
We can not alter the formula of the substance involved in a chemical reaction.
We just have to calculate the number of atoms on the both side of the reaction to balance it.

For eg. when magnesium is reacted with oxygen, magnesium oxide is formed whose formula is MgO
Mg + O₂ $\to$ MgO
Balanced reaction is:
2Mg + O_{2 $\to$} 2MgO
We cannot change the formula of Magnesium oxide as MgO₂to balance it.

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State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.

(a) Cutting a log of wood into pieces is a chemical change. (True/False)

(b) Formation of manure from leaves is a physical change.

(True/ False)

(d) Iron and rust are the same substances. (True/False)

(e) Condensation of steam is not a chemical change. (True/False)

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