Question

A 5.0-gram sample of Fe(s) is to be placed in 100. milliliters of HCl(aq). Which changes will result in the fastest rate of reaction?

Answer 1

The fastest rate of reaction between Fe(s) and HCl(aq) can be achieved by increasing the temperature, using iron in powdered form to increase surface area, and using a more concentrated hydrochloric acid solution.

Step-by-step explanation:

The fastest rate of reaction between Fe(s) and HCl(aq) will result from three primary changes:

Increasing the temperature of the hydrochloric acid, which increases the kinetic energy of the reacting particles.

Increasing the surface area of the iron by using a form such as powder rather than a single lump or nail, which provides more area for the acid to react with.

Increasing the concentration of the hydrochloric acid, which increases the number of reactive particles in the solution.

These changes apply the principles of collision theory to accelerate the rate at which the chemical reaction occurs between the solid iron and the aqueous hydrochloric acid.

Answer 2

Raising the temperature of the reactants increases the reaction between the reactants. The kinetic energy of the molecules of the reactants collides more frequently with ach other thereby increasing its reaction. Increasing the concentration of the reactants increases the reaction rate. Adding a catalyst to the reaction increases the rate of reaction of a substance. The catalyst hastens the chemical reaction.