1) The rate-temperature relation is explained by the fact that an increase in te
ID: 520637 • Letter: 1
Question
1) The rate-temperature relation is explained by the fact that an increase in temperature is a) causes the volume to increase and collisions to be less frequent, b) causes the activation energy to be less and the likelihodd of an effective collision to increase c) causes the density to decrease and the likelihood of an effective collision to decrease d) causes moleducles to increase their speed and be more likely to exceed the activation energy 2) Which of the following statements best describe a reaction mechanism? a) It is a description of the molecular orientation required for an effective reactant collision. b) It is the combination of activation energy and molecular orientation for an effective collsion, c) It is the seequence of steps by which reactants are turned into products d) It is the collection of conditions which must be met for reactants to turn into products
Explanation / Answer
1. d) causes molecules to increase their speed and be more likely to exceed the activation energy
Reactants collide with each other all the time. But only those collisions that have energy more than activation energy will lead to products. As temperature increases the resulting collisions will be of high energy and help the reactants cross the activation energy barrier to form products.
2. c) It is the sequence of steps by which reactants are turned into products
Reactants can form products directly or via transition states and intermediates. The formation of intermediates from reactants in a stepwise fashion to form products is a reaction mechanism.
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