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Improving Students’ Conceptual Knowledge in General Chemistry Using Desire2Learn Joann Pfeiffer Century College (Twin Cities, MN)

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Presentation on theme: "Improving Students’ Conceptual Knowledge in General Chemistry Using Desire2Learn Joann Pfeiffer Century College (Twin Cities, MN)"— Presentation transcript:

1 Improving Students’ Conceptual Knowledge in General Chemistry Using Desire2Learn Joann Pfeiffer Century College (Twin Cities, MN)

2 Project Goal: Have students take a “quiz” in D2L for each topic covered in General Chemistry. Motivation: Students need to test themselves on conceptual understanding, not just on problems. The quiz tool in D2L provides an effective and efficient means for providing students with lots of questions.

3 “Quiz” Set-Up 10 multiple choice questions randomly selected from a question library Unlimited number of attempts allowed Highest attempt automatically recorded in the D2L gradebook Quiz questions with answers provided immediately after submission No time limit on the “quiz”; completion required before exam on the material Focus of questions is on conceptual knowledge

4 Example Questions 1.For the reaction A = B, the rate law is Rate = k[A]. What are the units of the rate constant where time is measured in seconds? a) M -1 s -1 b) Ms c) s/Md) M 2 /se) s -1 2.What determines the exponents in a rate law? i. experimentation ii. the coefficients in the balanced equation iii. the concentrations of the reactants a) i only b) ii onlyc) iii only d) i and iie) ii and iii

5 Examples 3.In general, as the temperature increases, the rate of a chemical reaction a) decreases due to fewer collisions with proper molecular orientation. b) decreases for endothermic reactions. c) decreases for exothermic reactions. d) increases due a greater number of effective collisions. e) increases due to a lowering of activation energy.

6 Time-Saving Tip.rtf (Rich Text File) [Word].xml File [D2L] Respondus

7 Topics for Gen Chem II Quiz Topic (points)Number of Questions Kinetics (10)34 Equilibrium 1 (5)43 Equilibrium 2 (5)17 Acid/Base (10)42 Oxidation/Reduction (10)41 Thermodynamics (10)44 Solids (10)28 Naming (10)27 VSEPR (10)36 Electron Configuration (10)27 Quantum (10)23

8 Results for Gen Chem II

9 Summary of Results for Gen Chem II Most students took each quiz until they got the maximum value possible On average, each student took the quiz 4-5 times 20% of the students in section 1 and 6% in section 2 took a quiz after earning the maximum value possible 43% of the students in section 1 and 24% in section 2 took quizzes that weren’t graded as a review for the final

10 Topics for Gen Chem I Quiz Topics (points)Number of Questions Intro/Sig Figs43 Atoms/mass51 Naming inorganics81 Rxns in aq soln49 Quantum51 Electron Configuration (5)40 Periodic Properties (5)22 Lewis Dot / VSEPR72 Thermochem38 Gases65 Intermolecular Forces37

11 Results for Gen Chem I

12 Summary of Results for Gen Chem I Most students took each quiz until they got the maximum value possible On average, each student took the quiz 4.2 times 8.6% of the students took a quiz after earning the maximum value possible 14% of the students took quizzes that weren’t graded as a review for the final

13 Student Opinions – Gen Chem I On a scale from 1=strongly disagree to 5=strongly agree The D2L quizzes were useful when studying the material for the course4.12 I find the study guides for the exams useful4.12 I liked working in groups on the activities in discussion sections (POGIL)3.46 I used my textbook often when studying the material for this course2.79 I used the CD-ROM disks that came with the text often.1.76

14 Acknowledgements Dr Larry Litecky, President of Century College Center for Teaching and Learning at Century College Thank You


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