Rate of reaction increases by increasing temperature because:
Correct answer: C. Collision frequency and energy increase
- A. The concentration of the reactants increases
- B. The activation energy for the reaction decreases
- C. Collision frequency and energy increase
- D. All of the above
Explanation
The correct answer is that collision frequency and energy increase. When temperature increases, the kinetic energy of molecules increases, leading to more frequent and energetic collisions. This enhances the likelihood that reactant molecules will overcome the activation energy barrier, hence increasing the reaction rate. The concentration of reactants does not inherently increase with temperature, and activation energy remains constant, so those options are incorrect.
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About Reaction Kinetics
Reaction kinetics relates reaction rate to concentration, temperature, surface area and catalysts. Questions cover rate laws, reaction order, rate constants, activation energy and the activated complex, including how a catalyst lowers the activation energy without changing the overall energy change or equilibrium position.
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