Chemistry, Rate of Reaction

Factors Affecting Rates of Reaction

Thanks to Michelle Craig

Manitoba Curriculum
Chemistry Grade 12; Kinetics, Topic 3-08

Objectives
To design short experiments to investigate and explain qualitatively using collision theory the relationship between reaction rate and temperature, concentration, catalyst, and surface area.

Apparatus and Materials Available
3 x 250 mL beakers magnesium ribbon (1 cm)
3 x test tubes magnesium powder test tube rack mossy zinc
10 mL graduated cylinder copper turnings
3 x Alka Seltzer® tablets copper(II) sulfate
0.1 M hydrochloric acid, HCl hot bath
1.0 M hydrochloric acid, HCl ice bath
6.0 M hydrochloric acid, HCl steel wool pieces of zinc (1 cm x 1 cm) thermometer *additional materials may be made available upon request*

Part 1: Affect of Temperature

Designing an Experiment
A) Design a simple experiment using the reaction of Alka Seltzer® with water that will qualitatively investigate the affect of temperature on the rate of reaction. You may use any of the materials listed above in your investigation. Keep in mind that, in any experiment where you want to determine the affect of one variable, you should attempt to keep all other variables constant.

Write out the steps to your procedure in point form. Be sure to include the details of what variables are remaining unchanged between trials and which is being altered.

B) Design a data table to record your results and observations.

Hypothesis
State your hypothesis before carrying out your procedure.

Procedure
Carry out the steps of the experiment that you designed, recording the results and observations in the data table that you designed.

Conclusions
a) Write a statement that is one or two sentences long to summarize your findings regarding the affect of temperature on the rate of reaction.

b) Look on the side of the Alka Seltzer® bottle to determine the main ingredient in the tablet and