Which information is not conveyed by a balanced chemical equation?

Options

A. Physical quantity of reactants and products.
B. Symbols and formula of all the substances involved in a particular reaction.
C. Number of atoms/molecules of the reactants and products formed.
D. Whether a particular reaction is actually feasible or not.

Answer

To answer the question "Which information is not conveyed by a balanced chemical equation?", we can analyze the options provided and determine what a balanced chemical equation does and does not convey.

### Step-by-Step Solution:

1. **Understanding Balanced Chemical Equations**: A balanced chemical equation represents a chemical reaction where the number of atoms for each element is equal on both the reactant and product sides. It provides specific information about the reactants and products involved in the reaction.

2. **Evaluating Option A**:
- Option A mentions "the physical quantity of reactants and products".
- A balanced chemical equation often includes the physical states of the substances (solid, liquid, gas, aqueous). Therefore, this information **is conveyed** by a balanced equation.

3. **Evaluating Option B**:
- Option B states "the symbol and formula of all substances involved in a particular reaction".
- A balanced chemical equation includes the chemical formulas of all reactants and products. Thus, this information **is conveyed** by a balanced equation.

4. **Evaluating Option C**:
- Option C refers to "the number of atoms, molecules of reactants and products formed".
- A balanced equation shows the stoichiometric coefficients, which indicate the number of molecules or moles of each substance involved. Hence, this information **is conveyed** by a balanced equation.

5. **Evaluating Option D**:
- Option D states "whether a particular reaction is physical or not".
- A balanced chemical equation does not provide information about whether the reaction is physical or chemical. This determination usually requires additional thermodynamic analysis, such as Gibbs free energy changes. Therefore, this information **is not conveyed** by a balanced equation.

6. **Conclusion**: Based on the evaluations, the correct answer is **Option D**: "whether a particular reaction is physical or not".