Pressure will affect the reaction in case a reaction on the gas Increasing the pressure of the gas molecules are more reactive collision is likely to occur faster.
The pressure will affect the reaction in case of gas-related reaction. That is, when added to the pressure in the gas molecules collide, there will be a greater reaction rate will be faster.
The pressure will be applied to the reaction in the case of reaction gas, i.e. when you add the pressure of gas molecules will have to fight each other, will react with the birth rate.