In a homogeneous system , all the reactants and products are in the — Chemical Equilibrium Chemistry Question

💡 Solution & Explanation

# Homogeneous System Definition **Step 1: Understand what "homogeneous system" means** A homogeneous system is one where all components have uniform properties throughout, with no visible boundaries or interfaces between different phases. **Step 2: Identify the phase requirement** In a homogeneous system, all reactants and products must exist in the **same physical state (phase)**. **Step 3: Apply to chemical reactions** For a reaction to be homogeneous: - All substances must be in one phase only - Examples: all gases, all liquids, or all dissolved in solution - No solid-liquid or gas-liquid interfaces present **Step 4: State the answer** All reactants and products are in the **same phase** (or same physical state). --- **Why B is correct:** The defining characteristic of a homogeneous system is uniformity throughout—this requires all components to be in identical phases. If different phases were present, it would be a heterogeneous system with visible boundaries. *Examples:* - Homogeneous: $H_2(g) + Cl_2(g) \rightarrow 2HCl(g)$ (all gases) - Heterogeneous: $CaCO_3(s) \rightarrow CaO(s) + CO_2(g)$ (solid and gas)