part a part b part c part d A catalyst is a substance which increases the rate o

Question

part a

part b

part c

part d

A catalyst is a substance which increases the rate of a reaction. The most common first description is that a catalyst lowers the activation energy of the reaction. It is more accurate to state that a catalyst provides a different, lower energy pathway for the reaction to occur. An important characteristic of all catalysts is that they are chemically unchanged by the reaction they catalyze. E. Ep If a catalyst is chemically unchanged in a reaction, what does that imply about it before and after the reaction? The chemical formula of the catalyst is unchanged by the reaction. The physical characteristics of the catalyst are unchanged by the reaction. The physical characteristics of the catalyst are somewhat changed by the reaction. The chemical formula of the catalyst is changed somewhat by the reaction.

Explanation / Answer

Part a - it implies that the chemical formula of the catalyst is unchanged by the reaction. ( Hence the first option is correct)

Part b- the difference between the catalysed pathway and regular pathway is the difference in activation energy. Catalysed pathway provides a lower activation energy path and hence enhances the rate of reaction.

There the last option (d) is correct, i.e catalytic pathway must reduce the activation energy of the reaction.

Part C - the right hand diagram better represents a catalysed reaction, as the activation energy in it is less.

Hence the last option is correct

Part d - a catalyst doesn't affects the heat of reaction it only provides an alternate path for the reaction to occur with lower activation energy.

So the third option will be correct.

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