Fill in the blanks by choosing the appropriate word/words from those given in the brackets.(dialysis, peptization , dispersed phase , dispersion medium , electrophoresis , electro-osmosis , adsorption , coagulates, emulsion , gel, gold number, tyndall effect, protective colloids, electrodialysis )
Heterogeneous catalysis is successfully explained by............................. theory.

Explanation

To fill in the blank in the statement "Heterogeneous catalysis is successfully explained by __________ theory," we need to identify the appropriate term from the provided options.

### Step-by-Step Solution:

1. **Understanding Heterogeneous Catalysis**:
- Heterogeneous catalysis occurs when the reactants and the catalyst are in different phases. For example, a solid catalyst facilitating a reaction between gaseous reactants.

2. **Role of Catalysts**:
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