Write the chemical formulae and hence balance the following word equation:
Calcium Hydrogen Carbonate $\overset{∆}{\to}$ Calcium Carbonate + Water + Carbon dioxide

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Solution

Definition of chemical reaction
The transformation of a chemical substance into a new chemical substance by making and breaking bonds between different atoms is known as Chemical Reaction.
Definition of the balanced equation
Balanced chemical equations possess the same number of atoms of distinct elements in reactants as well as products
Why is it necessary to balance a chemical equation
According to the law of conservation of mass, matter can neither be created nor be destroyed in a chemical reaction. This is possible only if a total number of atoms on the reactant's side equals the total number of atoms on the product side. Thus, a chemical reaction should be always balanced. must exist on the product side and reactant side of the equation.
Step 1
Representation of Chemical Reaction
Calcium hydrogen carbonate is heated
The reaction can be written as $Ca {({HCO}_{3})}_{2} \overset{∆}{\to} {CaCO}_{3} + {CO}_{2} + H_{2} O$
Step 2
Calculating the number of atoms on both sides of the reaction
ELEMENTS NO. OF ATOMS ON REACTANT SIDE NO. OF ATOMS ON PRODUCT SIDE
$Ca$ 1 1
$H$ 2 2
$C$ 2 2
$O$ 6 6
Step 3
Balancing the uneven number of atoms on the reactants and product side
As the atoms of each element are not equal on both sides of the reaction we need to add stoichiometric coefficients to balance each element
All the elements are balanced in the equation
Therefore fulfilling the law of conservation of mass the number of atoms and masses remains the same on the reactant and product side
The equation becomes: $Ca {({HCO}_{3})}_{2} \overset{∆}{\to} {CaCO}_{3} + {CO}_{2} + H_{2} O$
ELEMENTS NO. OF ATOMS ON REACTANT SIDE NO. OF ATOMS ON PRODUCT SIDE
$Ca$ 1 1
$H$ 2 2
$C$ 2 2
$O$ 6 6
The final balanced reaction is : $Ca {({HCO}_{3})}_{2} \overset{∆}{\to} {CaCO}_{3} + {CO}_{2} + H_{2} O$

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