The word that completes the sentence is "Increasing." An increase in temperature generally leads to an increase in the reaction rate. This is because an increase in temperature gives the reactant particles more energy, causing them to move faster and collide more frequently. As a result, the chances of successful collisions and the formation of product molecules increase, leading to a faster reaction rate. To determine the effect of temperature on the reaction rate, you can conduct an experiment by varying the temperature and measuring the rate of the reaction at each temperature. By comparing the results, you can observe the relationship between temperature and reaction rate.
