What must be true about the phase of the catalyst relative to the reactants in heterogeneous catalysis?

Answer

The catalyst must be in a different phase than the reactants

Heterogeneous catalysis is defined by the catalyst existing in a phase distinct from that of the reactants, most commonly a solid catalyst acting upon liquid or gaseous reactants.

What must be true about the phase of the catalyst relative to the reactants in heterogeneous catalysis?

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