A student investigates the decomposition of hydrogen peroxide into water and oxygen.
The student repeats the experiment under identical conditions (same volume and concentration of hydrogen peroxide, and same temperature) but adds a small amount of manganese(IV) oxide catalyst.
In the experiment with the catalyst added, which statement is correct?
The catalyst is chemically changed and used up by the end of the reaction.
The total volume of oxygen produced when the reaction goes to completion is the same as without a catalyst.
The rate of the reaction is slower than when no catalyst is present.
The catalyst increases the activation energy required for the reaction to occur.
