A catalyst works by doing what in a chemical reaction?

A catalyst works by doing what in a chemical reaction?

• A. It increases the rate by raising the temperature
• B. It changes the reactants into products
• C. It slows down the reaction
• D. It provides an alternative pathway with lower activation energy

Answer: (D)

A catalyst speeds up a chemical reaction by providing an alternative pathway with a lower activation energy. Activation energy is the energy barrier that reactants must overcome to become products; lowering this barrier means more molecules have enough energy to react at the same temperature, so the reaction proceeds faster. The catalyst itself is not consumed and does not change the final amount of products (the equilibrium)—it simply helps the system reach that equilibrium more quickly. It doesn’t achieve the rate increase by raising temperature, nor does it convert reactants into products directly on its own.

A catalyst speeds up a chemical reaction by providing an alternative pathway with a lower activation energy. Activation energy is the energy barrier that reactants must overcome to become products; lowering this barrier means more molecules have enough energy to react at the same temperature, so the reaction proceeds faster. The catalyst itself is not consumed and does not change the final amount of products (the equilibrium)—it simply helps the system reach that equilibrium more quickly. It doesn’t achieve the rate increase by raising temperature, nor does it convert reactants into products directly on its own.