Why the catalyst after the chemical reaction of its quality and chemical properties unchanged
In fact, the catalyst in the reaction process has become other substances, but after the end of the reaction, the catalyst has changed back. That is, the catalyst is actually involved in the reaction, except that the amount of catalyst being reacted is as much as it did.
In fact, the catalyst reaction also enters, which changes the rate of positive and negative reactions ... enhances the reactive molecules of the reactants, thereby changing the reaction rate ...
The catalyst does not react directly with the reactants, so its mass remains constant.
The catalyst is only a catalytic role, not directly involved in the reaction, the current principle of its role is not clear
