Factors affecting the rate of a chemical reaction

 

background [prelab assignment (30 points) due at the begining of lab]

This laboratory activity is based on investigation 10 in your AP chemistry lab manual; thus, it provides some relevant background for the following prelab questions and this laboratory activity.

1. the website is a simulation of a redox reaction, where KI reacts with hydrogen peroxide in an acidified aqueous solution; the unbalanced net ionic equation: H +(aq) + I -(aq) + H2O2(aq) → I2(aq) + H2O(l). the simulation allows one to investigate the effect of various factors. based on the simulation, . . . [8 points]

a. what is the basis of the color of the solution becoming yellow ? justify your answer.

b. what is the rate law for this reaction ?

c. how to investigate the effect of each parameter in the rate law for the reaction ?

d. what is the significance / purpose / role of the variable volume of water ?

2. the website is a java-based simulation that could be used to illustrate various concepts in kinetics / chemistry. [10 points]

a. in the "single-collision" tab, open the "energy view" tab and select "angled shot" radio button. list / describe three concepts in kinetics that could be illustrated using this simulation.

b. in the "many collision" or "rate experiments" tab, list / describe two additional (i.e. not mentioned in the preceding section) concepts in kinetics that could be illustrated using this simulation.

3. in regards to the reaction of solid calcium carbonate by an aqueous solution of hydrochloric acid, . . . [12 points]

a. write the chemical equation describing this reaction

b. list three factors that may affect the rate of the reaction.

c. design experiments to investigate these factors. clearly associate the experiment to the factor under study. experimental design is restricted by the availability of the content in the below materials section.

purpose

examine at least three factors affecting the reaction of solid calcium carbonate by an aqueous solution of hydrochloric acid using the below materials; need not use all equipment; data may be quantitative and / or qualitative.

both the prelab and content of lab report has minimal support / gudiance - its purpose is to assess your "inquiry lab skills"

materials

solid calcium carbonate, water, 6 M hydrochloric acid

ice; ring stand setup / bunsen burner

mortar and pestle

stopwatch (bring your own; may use your cell phone)

balance, beakers, flasks, graduated cylinder, eudiometer tube setup, pressure probe; tubing, stopper

methods / data analysis

student design

content of lab report [30 points]

prepare a lab report with the following sections with the appropriate content

introduction

methods

results

discussion

appendix: photocopy of your lab NB for this lab; may not revise content after lab is done

to accomplish the goals of the lab described in the purpose.