Question

hich of the following changes always leads to an increase in the rate constant for a reaction: Decreasing the temperature Decreasing the activation energy Making the value of ΔEΔE more negative Only one—(i), or (ii), or (iii)—increases the reaction rate. (i) and (ii) (i) and (iii) (ii) and (iii) All three—(i), (ii), and (iii)—increase the reaction rate.

Answer 1

Answer:

Only one—(i), or (ii), or (iii)—increases the reaction rate.

Explanation:

Which of the following changes always leads to an increase in the rate constant for a reaction?

• Decreasing the temperature. NO. A lower temperature leads to a slower reaction because the molecules have less energy to react.
• Decreasing the activation energy. YES. According to the Arrhenius equation, the lower the activation energy, the higher the rate constant.
• Making the value of ΔE more negative. NO. A more negative ΔE means a reaction is more spontaneous but not faster.