The effect of temperature on the rate of reaction between magnesium and hydrochloric acid can be explained using the collision theory. As the temperature increases, the kinetic energy of the particles magnesium and hydrochloric acid molecules also increases. This results in more frequent collisions between the reacting particles and a higher probability of successful collisions with the required activation energy.In summary, an increase in temperature leads to an increase in the rate of reaction between magnesium and hydrochloric acid. This is because the particles move faster and collide more frequently, resulting in a higher number of successful collisions and faster formation of products magnesium chloride and hydrogen gas . Conversely, a decrease in temperature would slow down the reaction rate.