The reaction rate of magnesium and hydrochloric acid will vary depending on the form of magnesium used powder, ribbon, or solid . The reaction between magnesium and hydrochloric acid is as follows:Mg s + 2 HCl aq MgCl2 aq + H2 g The reaction rate depends on the surface area of the magnesium that is exposed to the hydrochloric acid. The greater the surface area, the faster the reaction rate. This is because more magnesium particles are in contact with the hydrochloric acid, allowing for more collisions between the reactant particles and thus a faster reaction.1. Magnesium powder: The reaction rate will be the fastest with magnesium powder because the powder has the highest surface area among the three forms. The small particles of the powder have more surface area exposed to the hydrochloric acid, allowing for more collisions and a faster reaction rate.2. Magnesium ribbon: The reaction rate will be slower than that of the powder but faster than that of the solid block. The ribbon has a larger surface area than the solid block but smaller than the powder. The increased surface area compared to the solid block allows for more collisions between the reactant particles, resulting in a faster reaction rate than the solid block.3. Solid magnesium block: The reaction rate will be the slowest with a solid block of magnesium because it has the smallest surface area among the three forms. With less surface area exposed to the hydrochloric acid, there are fewer collisions between the reactant particles, resulting in a slower reaction rate.In summary, the reaction rate of magnesium and hydrochloric acid will be the fastest with magnesium powder, followed by magnesium ribbon, and slowest with a solid magnesium block due to the differences in surface area exposed to the hydrochloric acid.