Question

the graph shows how enzymes affect reactions in
enzymes reverse the direction of the reaction.
enzymes decrease the energy level of the products.
enzymes decrease the activation energy of the reaction.
enzymes increase the energy of the reactants.

Explanation:

• Analyze the first option: Enzymes do not reverse the reaction direction; they speed up reactions by lowering activation energy, so this is incorrect.
• Analyze the second option: Enzymes don't change the energy level of products. The energy difference between reactants and products (C) is related to the reaction's enthalpy, not enzyme action, so this is wrong.
• Analyze the third option: The graph shows the activation energy (the peak height) is lower with enzyme (A is the difference in activation energy with and without enzyme). So enzymes decrease activation energy, this is correct.
• Analyze the fourth option: Enzymes don't increase reactant energy. The reactant energy level is the same with or without enzyme, so this is incorrect.

Answer:

Enzymes decrease the activation energy of the reaction.