Reflection: Unit Exams Reaction Rate Demonstrations - Section 3: Test Review: Student Work Time


Due to the size of this unit, I decided to chunk our unit exam, giving them the first 12 questions on collision theory and reaction rates on one day, and then giving the 13 equilibrium based questions at the end of that instruction.

This year I have students with very low reading levels in chemistry, and our questions for these topics, in an attempt to write higher order multiple choice, became very wordy. I was concerned that with students having to deal with simple rates of forward reactions, and explaining LeChatelier shifts in terms of rates of forward and reverse reactions, that students would get unnecessarily confused.

By splitting the exam, I expected students to perform better on both parts.  However, what entailed was that they did very poorly on the collision theory part, but did fairly well on the equilibrium part.  Perhaps the extra practice of considering equilibrium shifts in terms of effects of concentration and temperature on the forward and reverse reaction rates would have shored up their misunderstandings.  Next year I will leave it together as a full unit to see if the application of kinetics within the study of equilibrium makes a difference in performance.

Due to the low test performances, I did engage students in re-teaching and re-assessing, and explain the process in this lesson.

  Unit Exams: Chunking?
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Reaction Rate Demonstrations

Unit 5: Kinetics and Equilibrium
Lesson 7 of 17

Objective: SWBAT predict and observe rates of reactions of various chemical demonstrations, and explain their choices in terms of the Collision Theory of chemical reactions.

Big Idea: The rate of a reaction is controlled by the number of properly aligned collisions between reactants who have enough activation energy.

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5 teachers like this lesson
Science, Chemistry, equilibrium, kinetics
  50 minutes
reaction rates
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