Reflection: Lesson Planning Investigating Rates of Reactions, pt 3 - Section 2: Synthesis: Poster Creation


There are many variations on how this investigation can be done in the classroom.  Originally, it was designed by our curricular team to be a performance assessment.  It would not take much modification to do exactly that.  Instead of giving student choice on whether to speed or slow the reaction, the teacher could dictate the terms, and perhaps even set a target time that students needed to hit.  Students could then combine various reaction alterations to hit that time target, whether it be crushing the tablets and heating the water, or changing the water temperature to a specific amount.

The opportunity to present their findings allows for another variation.  Due to the curricular timeline, I did not have students present.  However, if my school improvement focus for this year was on oral communication, I may have taken the time to still present, even in small groups.

Depending on the structure of the lab investigation and the role of various groups, you could institute a peer review in the middle, or at the end.  Students could give each other feedback to improve their investigations or their final posters.

Finally, a project like this needs to be adaptable for multiple years.  Repeating this same experiment will eventually lead to cheating among students and boredom for any students repeating the course.  The simplest modification is to use different reactions, such as that between zinc and hydrochloric acid, or calcium carbonate and an acid.  These reactions would allow for greater variability in lab, as students could alter temperature, concentration, and surface area.  The endpoint of these reactions may be easier for students to see.

  Variations on this Investigation
  Lesson Planning: Variations on this Investigation
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Investigating Rates of Reactions, pt 3

Unit 5: Kinetics and Equilibrium
Lesson 5 of 17

Objective: SWBAT conduct their own investigation to speed up or slow down the reaction of alka seltzer with water and present their findings.

Big Idea: Evidence for the collision theory of reactions can be found in common chemical reactions.

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1 teacher likes this lesson
Science, Chemistry, equilibrium, kinetics
  50 minutes
alkaseltzer poster
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