CH-709
Catalysts
Chemistry · Secondary 3 · Hard · Catalysts
For a certain reaction, the activation energy without a catalyst is 120 kJ mol⁻¹. When a catalyst is added, the activation energy becomes 70 kJ mol⁻¹. The overall energy change of the reaction stays the same.
Which statement best explains why the reaction is faster with the catalyst?
Which statement best explains why the reaction is faster with the catalyst?
- Fewer collisions occur between reacting particles each second.
- More particles now have enough energy to react in each second, so there are more successful collisions.
- The catalyst supplies extra heat to the reactants, raising the temperature.
- The catalyst changes the reactants into different substances before the reaction starts.
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