Answer: In the same phase.
- A In different phases
- B In the same phase
- C Rarely mixed together
- D Usually solids
Correct answer: B. In the same phase
Explanation: Homogeneous catalysis occurs when catalyst and reactants exist in the same phase, such as all being gases or all in solution.
A typical adsorption isotherm: x/m (mass adsorbed per gram of adsorbent) rises steeply at low pressure, then flattens into a saturation plateau as the adsorbent surface fills up.
Concept context
Explore the chemistry that happens at interfaces, from catalysts that speed up industrial reactions to colloids like milk, smoke, and gels that surround us every day.