Which information is not conveyed by a balanced chemical equation ?

Question

Accepted Answer

A balanced chemical equation provides specific information about a chemical reaction, but it does not convey every possible detail about the reaction. Let's examine why Option 4 is the correct answer and why the other options are incorrect:

1. **Option 4: Whether a particular reaction is actually feasible or not**  
   A balanced chemical equation does not indicate the feasibility of a reaction. Feasibility depends on various factors such as thermodynamics (e.g., Gibbs free energy), kinetics (reaction rate), and environmental conditions (e.g., temperature, pressure). A balanced equation simply shows the stoichiometry of the reaction, meaning the proportion of reactants and products, but it does not provide information about whether the reaction will occur under given conditions. Therefore, Option 4 is correct because the feasibility of a reaction is not conveyed by a balanced chemical equation.

2. **Option 1: Physical states of reactants and products**  
   Balanced chemical equations often include symbols that denote the physical states of the substances involved, such as (s) for solid, (l) for liquid, (g) for gas, and (aq) for aqueous solutions. These symbols are typically written next to the chemical formulas in the equation, providing information about the physical states. Therefore, Option 1 is incorrect because a balanced chemical equation can convey the physical states of reactants and products.

3. **Option 2: Number of atoms/molecules of the reactants and product formed**  
   A balanced chemical equation explicitly shows the number of atoms or molecules involved in the reaction. The coefficients in front of the chemical formulas indicate the relative amounts of each substance, ensuring that the law of conservation of mass is satisfied. This means that the number of atoms of each element is the same on both sides of the equation. Therefore, Option 2 is incorrect because a balanced chemical equation does convey the number of atoms/molecules of the reactants and products.

4. **Option 3: Symbols and formulae of all the substances involved in a particular reaction**  
   A balanced chemical equation includes the chemical symbols and formulas of all reactants and products involved in the reaction. These symbols and formulas provide a clear representation of the substances participating in the reaction. Therefore, Option 3 is incorrect because a balanced chemical equation does convey the symbols and formulae of all the substances involved.

In conclusion, Option 4 is the correct answer because a balanced chemical equation does not provide information about the feasibility of a reaction. The other options are incorrect because a balanced chemical equation does convey the physical states, the number of atoms/molecules, and the symbols and formulae of the substances involved.