Question

please provide proper explanation

For part 3 - the effect of a catalyst : Time it took for the mixture to turn blue when a catalyst wass added to reactants

Describe the effect of a catalyst below. Use the rate you observed to back your description

Part 2: Determination of the Activation Energy: 1) In this section you will measure the rate of reaction at four different temperatures. To do this you'll use the same reaction mixture as in the first reaction from the previous part. mL 0.0600 mL 0.100 ml M KBrOs mL water 0.0300 M KI M HCI 1.0 1.0 2.0 1.0 2) Begin by making the mixture above and using Capstone to measure the rate as you did in the first part of the lab. Record the temperature of the reaction mixture to one decimal place 3) Your instructor will have set up three temperature baths. Each one will have a thermometer in it, which you can use to record the temperature. These temperatures should all be recorded to the the nearest tenth of a degree. 4) Set up a ring stand with two clamps on it. These clamps need to hold the cuvette and a medium test tube, so choose wisely 5) Pipet and mix the KBrO3, HCl, and water in the cuvette just as you did in the first part of the lab. Pipet the KI solution into a clean medium test tube. 6) Clamp the cuvette and test tube into the two clamps on the ringstand you set up Bring this over to one of the temperature baths, and lower the cuvette and test tube into the water bath, so that the water covers as much of the reaction solutions as possible. Allow the solutions to come to the temperature of the water bath by letting them sit for 10 minutes. 7) Record the temperature of the water bath. Now take the cuvette and test tube out. As quickly as you can, bring these back to your workstation, pour the KI solution into the cuvette, place the cuvette into the colorimeter, and start the run. Wait until the absorbance has passed 1.0 to stop the run. 8) Repeat steps 5 through 7 using the other two temperature baths. When you're finished, you should have four reaction runs, each at a different temperature. Determine the rate of reaction for each run in the same way you did in the first part of the lab, and record this data. Part 3: The Effect of a Catalyst: 1) For this part, you simply need to make up another reaction mixture following the table above, but also place a drop of FeCl, solution into the cuvette before adding the KI solution and starting the run. Record your observations. Reaction Kinetics Laboratory Report Name: Date: Partner's Name: Instructor's initials:- - Data: Part 1: Determination of the Rate Law: on Trial time (s) Rate (sBrOs *: Rate is defined as where time is how long it takes for the absorbance to increase from 0.60 to 0.80 Part 2: Determination of the Activation Energy: k) In(Rate) Temperature! TCK) | time (s) | Rate** Trial 0.00362 -6-80 0-0033 4-SL ** Rate is defined aswhere time is how long it takes for the absorbance to increase from 0.60 to At 0.80 Reaction Kinetics 62 Part 3-The Effect of a Catalyst Time it took for the mixture to turn blue when a catalyst was added to the reactants Part 3: The Effect of a Catalyst: Describe the effect of a catalyst below. Use the rate you observed to back your description

Answer 1

Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. ... The only effect of the catalyst is to lower the activation energy of the reaction. Thecatalyst does not affect the energy of the reactants or products (and thus does not affect ΔE).

To increase the rate of a reaction you need to increase the number of successful collisions. One possible way of doing this is to provide an alternative way for the reaction to happen which has a lower activation energy.