Which change of condition will decrease the rate of the reaction between excess zinc granules and dilute hydrochloric acid?

A) increasing the amount of zinc
B) increasing the concentration of the acid
C) pulverizing the zinc granules into powder
D) decreasing the temperature

Question

Which change of condition will decrease the rate of the reaction between excess zinc granules and dilute hydrochloric acid?

A) increasing the amount of zinc
B) increasing the concentration of the acid 
C) pulverizing the zinc granules into powder
D) decreasing the temperature

aaronq · Answer

raising the concentration of any reactant doesn't lower the rate of the reaction, neither does increasing the surface area.