Catalysts can make it tricky to figure out which substances are starting points (reactants) and which ones are the results (products) in chemical reactions. They change how the reactions happen, making it hard to see which materials are really in play. This can cause confusion when trying to understand the different types of reactions.

Challenges:

• Signs that suggest the wrong level of reactivity.
• Hard to notice changes during the reaction.

Solutions:

• Plan experiments carefully.
• Use control experiments to see how catalysts affect the reactions.