Prelab Questions for Experiment 7 a chemical reaction may be imeeased by g the frequency of molecular increasing the enengy of molecular colisions eã lowering the activation energy of the reaction. d all of the above Increasing the 'emperature or a reaction a increases the frequency of molecular collisions. h increases the energy of molecular collisions 2. e. increases hoth the frequency and energy of molecular collisices the activaclon energy of the reaction. 3. Increasing te concentration of a reactant the frequency of molecular collisions a. increases h increases the energy of molecular collisions c increases both the frequency and energy of molecular collisions. d. lowers the activation energy of the reaction. 4. Increasing the surface area of a solid reactia a. increases the frequency of molecular collisions h increases the energy of molecular collisions. c. increases both the frequency and energy of molecular collisions d. lowers the activation encrgy of the reaction. 5ã The presence of a reaction catalyst a. increases the frequency of molecular collisions. increases both the frequency lowers the activation energy of the reaction. and energy of molecular collisions 6. Which has a greater surface area? a 1 kg of wood sawdust b a piece of solid wood with a mass of I kg The rate of a reaction usually doubles for every 10'C increase in temperature. Is heat a catalysi? Explain. s. What precautions should be observed when handling hydrochloric acid and hydrogen peroxide? Experiment 7 131
