Affect on Rate
Increasing the concentration of HCl (aq) will increase the reation rate.
More HCl particles 3 means there will be more collisions between HCl (aq) and Zn (s) .
Increasing temperature increases the reaction rate.
HCl particles will gain more kinetic energy increasing the number of collisions with Zn atoms.
More Zn (s) and HCl (aq) particles will have sufficient energy to react resulting in more successful collisions. Particle Size Reducing the size of Zn (s) particles will increase the rate of reaction. Reducing the size of the Zn (s) particles increases the surface area available for reaction with HCl (aq) molecules resulting in more collisions. Stirring Rate Increasing the stirring rate of this mixture will increase the reaction rate. Stirring will keep small Zn (s) particles in suspension, increasing the surface area available for collisions, resulting in an increased reaction rate.