When a catalyst is added to a reaction mixture,

it has no effect on the equilibrium composition of the reaction.
it provides a lower activation energy for the reaction.
it speeds up both forward and reverse reactions.
it speeds up a reaction by providing an alternate pathway for the reaction
the rate law remains the same.

Which of these is/are true?

Question

When a catalyst is added to a reaction mixture,

it has no effect on the equilibrium composition of the reaction.
it provides a lower activation energy for the reaction.
it speeds up both forward and reverse reactions.
it speeds up a reaction by providing an alternate pathway for the reaction
the rate law remains the same.

Which of these is/are true?

BlackTom AI · Accepted Answer

Consider the role of a catalyst in a chemical reaction. 
Option 1: It has no effect on the equilibrium composition of the reaction. True. A catalyst speeds up the attainment of equilibrium but does not shift the position of equilibrium itself; it lowers the energy barrier for both forward and reverse processes equally. 
Option 2: It provides a lower activation energy for the reaction. True. The essence of a catalyst is to offer an alternative pathway with a smaller activation energy, making the reaction proceed more rapidly. 
Option 3: It speeds up both forward and reverse reactions. True. By providing a lower-energy pathway for the reaction steps, both directions are accelerated, maintaining the same equilibrium constant. 
Option 4: It speeds up a reaction by providing an alternate pathway for the reaction. True. This is the fundamental mechanism by which catalysts work: an alternate mechanism with a lower energy barrier than the uncatalyzed route.

类似问题

Which of the following is true when comparing an uncatalyzed reaction to the same reaction with a catalyst?

Which one of the following was described in the video as being a 'hallmark' of being a catalyst?

When a catalyst is used in a reaction,

An endothermic reaction becomes exothermic when a catalyst is added into the reaction mixture.

A catalyst alters the rate of a chemical reaction by

What is a main use of platinum group metals?

The effect of a catalyst on a reaction is to ________.

As of 2022, the world's human population was approximately:

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单