The effect of surface area on the rate of a chemical reaction between zinc and hydrochloric acid is significant. The rate of a chemical reaction is directly proportional to the surface area of the reactants. In this case, the reactants are zinc Zn and hydrochloric acid HCl .When the size of the zinc particles is varied, the rate of the reaction changes accordingly. If the zinc particles are smaller, they have a larger surface area exposed to the hydrochloric acid. This increased surface area allows for more collisions between the zinc and HCl molecules, leading to a faster reaction rate.Conversely, if the zinc particles are larger, they have a smaller surface area exposed to the hydrochloric acid. This results in fewer collisions between the zinc and HCl molecules, leading to a slower reaction rate.In summary, the rate of the reaction between zinc and hydrochloric acid increases as the surface area of the zinc particles increases. Smaller zinc particles will react more quickly with HCl than larger zinc particles due to their larger surface area.