Reflection: Checks for Understanding Conducting the Reaction Rate Experiment - Section 6: Debrief

 

I have a number of concerns I have regarding this sample student data. First, students did not record an initial mass, which must be calculated by adding together the mass of the acid and the calcium carbonate before they are mixed together. Second, for variable the total yield is 1.12 g of carbon dioxide, but our stoichiometry predicted a maximum yield of 0.6g. The second trial has nowhere near 0.6 g.

This is not a big deal—but in light of the fact that I am hoping students have data that can show the influence of factors on reaction rates, it seems like a good idea for me to draw the class’s attention to these discrepancies before everyone has collected all of their data. By doing so, I am better able to support students in collecting data properly, and to self-assess their data so they can detect measurement error. I can also more fairly assess their final lab report if I have taken the time to give them these skills.

  Helping Students Assess Data
  Checks for Understanding: Helping Students Assess Data
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Conducting the Reaction Rate Experiment

Unit 6: Reaction Rates
Lesson 7 of 8

Objective: Students will conduct a reaction rate experiment they designed and determine if their results are reasonable based on a calculated theoretical yield.

Big Idea: Reaction rates are influenced by temperature, concentration, and surface area. A theoretical yield from stoichiometry is a good benchmark for determining if experimental data is reasonable.

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