Which of the following statements about chemical kinetics is FALSE? 1. A catalys
ID: 971041 • Letter: W
Question
Which of the following statements about chemical kinetics is FALSE?
1. A catalyst increases the value of a rate constant k by lowering the activation energy Ea.
2. Reactant molecules must have the correct collision geometry in order to start bond-breaking and/or bond-making.
3. Higher reaction temperatures generally increase the rate of a reaction, all else being equal.
4. Reactant molecules must have a minimum kinetic energy upon collision to start bond-breaking and/or bond-making.
5. One-step trimolecular reactions are more statistically favorable than one-step bimolecular reactions.
Explanation / Answer
Statement 3 and 5 are incorrect
3 is incorrect because rate of reaction depends on whether the reaction is endothermic or exothermic and therfore increasing the temperature may or may not increase the rate of reaction
5 is false beacuse one step trimolecular reaction is less statistically favorable because there is less probabiity that three reactant molecules are available at same place and same time with correct geomertry