Chemistry, Rate of Reaction

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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 beakersmagnesium ribbon (1 cm)
3 x test tubesmagnesium powder
test tube rackmossy zinc
10 mL graduated cylindercopper turnings
3 x Alka Seltzer® tabletscopper(II) sulfate
0.1 M hydrochloric acid, HClhot bath
1.0 M hydrochloric acid, HClice bath
6.0 M hydrochloric acid, HClsteel 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 write the balanced chemical equation for the reaction that you observed.

c) Considering what you’ve learned about Collision Theory in class, explain how changing the temperate of a reaction will affect the reaction rate.

d) Put on your “particulate glasses” and take a look into each of your reactant vessels. Draw two pictures, one of the reactants at a low temperature, and the second of the reactants at a higher temperature. Explain in a caption box below each picture what is happening to the particles involved that is causing the observed change in reaction rate.

___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________

e) Give an example from your own experience where the affect of temperature on the rate of a chemical reaction has (or could) impact your life. Eg) Hypothermia OR create an analogy for the affect of temperature on the rate of reaction.

Part 2: Affect of Concentration

Designing an Experiment
A) Design a simple experiment using the reaction of zinc with hydrochloric acid that will qualitatively investigate the affect of concentration of the reactants on the rate of reaction. You may use any of the materials listed above in your investigation. 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...
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