A rise of 10 degrees Celsius roughly doubles the rate of many reactions mainly because
Correct answer: D. a much larger fraction of molecules acquire energy equal to or above the activation energy
- A. the activation energy of the reaction falls
- B. the concentration of the reactants increases
- C. the molecules become larger
- D. a much larger fraction of molecules acquire energy equal to or above the activation energy
Explanation
The Maxwell Boltzmann distribution shifts to the right on heating, and because the activation energy lies out in the tail of the curve, even a small temperature rise multiplies the number of molecules beyond it. The increase in collision frequency is real but accounts for only a few per cent of the effect. Activation energy itself is a property of the reaction and is not changed by heating.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Factors Affecting Rate of Reaction
Reaction rate depends on the nature and concentration of reactants, pressure for gases, temperature, surface area and catalysts. Collision theory explains these effects through collision frequency, orientation and activation energy, while questions often distinguish a catalyst's effect on reaction rate from its lack of effect on equilibrium composition.
Practise Reaction Kinetics
573 free Reaction Kinetics MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Factors Affecting Rate of Reaction questions
Which of the following will NOT increase the rate of a reaction between a solid and a solution?
A catalyst increases the rate of a reaction by
Powdering a solid reactant increases the rate of reaction because it increases the
Which statement about a catalyst is INCORRECT?
The phenomenon of negative catalysis is also known as: