Reactants in a transition state:
Correct answer: C. May return to reactants or proceed to form products
- A. Always change to product
- B. Return back to reactants
- C. May return to reactants or proceed to form products
- D. Are of low energy
Explanation
The transition state is a high-energy state, and some amount of energy - the activation energy - must be added for the molecule to reach it. Because the transition state is unstable, reactant molecules don't stay there long but quickly proceed to the next step of the chemical reaction. If the molecules in the reactants collide with enough kinetic energy and this energy is higher than the transition state energy, then the reaction occurs, and products form. But if the k.E of colliding molecules is not enough and so transition state then the colliding molecules just bounce back unchanged.
Last updated
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.
Practise Reaction Kinetics
573 free Reaction Kinetics MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
100 g of a substance decays slower than 50 g of the same substance. The order of decay follows kinetics:
12.Rate of disappearance of reactant is equal to
13.Rate of reaction, when concentration of reactants are taken as unity is called
14.Order of reaction of N2O5→2N2O5+ O2
16.Which order of reaction obeys the relation t1/2= 1/Ka