Inhibitor
An inhibitor decreases the reaction rate
It depends entirely on the particular reaction. See the Related Questions link for more about reaction rates.
The concentration of the reactants decreases.
The rate decreases as reactants are used up.
A catalyst is a material that speeds up a chemical reaction by providing an alternative pathway with lower activation energy. Alternatively, an inhibitor is a material that slows down a chemical reaction by blocking the active sites on the reactant molecules, preventing them from coming together or reacting.
The concentration of the reactants decreases.
Inhibitor~a material used to decrease the rate of reaction
In general, and depending on the order of the reaction, the rate will decrease as the reaction progresses.
A material that increases the rate of a reaction is called a catalyst. Catalysts work by lowering the activation energy required for a chemical reaction to occur, thereby increasing the reaction rate without being consumed in the reaction itself.
The rate goes down.
The reaction rate depends on the order of the reaction. In general (except for zero order), as the reaction progresses, the rate decreases with time.
increasing the concentration increases the rate of the reaction