Question

How can chemical equations be classified?

Answer 1

In chemistry, a chemical equation plays a major role. It contains three parts. There are reactant, product, and reaction conditions. The reactants are always on the left side of the equation. If more than one reactant in the equation means by using the plus sign. The product is always on the right side of the reaction. If there is more than one product, it is represented by using the plus sign. In between reactants, products are used arrows to find the reaction direction in the equation.

Complete answer:
The chemical equations are classified into five types: combination equation, single displacement equation, double displacement equation, combustion equation, and decomposition equation.
The chemical equations for the above are given below,
1. The chemical equation for the Combination reaction:
The two or more reactants react to give a product.
$A + B \to C$
Example: $2Na + Cl_2 \to 2NaCl$

2. The chemical equation for the Decomposition reaction:
The reactant reacts to give two or more products.
$A \to B + C$
Example: $NaCl \to Na + Cl$

3. The chemical equation for the Single displacement reaction:
The one reactant react to give the product in the single displacement of the compound as,
$A + BC \to AC + B$
Example: $Zn + 2HCl \to ZnCl_2 + H_2$

4. The chemical equation for the Double displacement reaction:
The one reactant react to give the product in the double displacement of the compound as,
$AD + BC \to AC + BD$
Example: $Na_2SO_4 + BaCl_2 \to + BaSO_4 + 2 NaCl$

5. The chemical equation for the Combustion reaction:
The two or more reactants react to give product(s) and heat will generate. These reactions are exothermic.
$A + B \to C$
Example: $CH_4 + 2O_2 \to CO_2 + 2 H_2O$

Note:
In a chemical reaction, generally, two arrows will be used in the product side of the equation. One is upwards and the other is downwards arrows. In general, upwards arrows are used for the evolution of the gas in the chemical reaction. In general, downwards arrows are used for the precipitation of solids in the chemical reaction. In a balanced chemical reaction wise, we predict the side product of the reaction. In some cases, we are not able to attain balance by changing the mole. In that case, we use the number of countable ions in the product and reactant side of the chemical reaction. In chemistry, the redox reaction is one of the types of major reactions. In this redox reaction, two methods are used to attain a balanced chemical reaction. There is the ion-electron method and the oxidation number method.