T-GEM, PhET, and Water Conductivity

Many concepts are difficult for students to understand without some form of visualization to aid the description. This week I have integrated T-GEM with a water conductivity PhET Simulation to create a lesson activity which can address misconceptions. A regular misconception that students have is that pure water conducts electricity. By the end of this lesson students should be able to communicate what makes water conductive.

 

Step 1: Introduction

-Students form groups of 2-3, each group will have a computer, paper, and writing utensil

-Review as a class:

1 – What is electricity? What is flowing?

2 – How do we make electricity?

3 – What is concentration (with respect to dissolved solids)?

4 – How could we make things more or less concentrated?

 

Step 2: Generate

Have students as a group generate ideas around the following key questions:

1 – Is water conductive?

2 – How does electricity move in water?

3 – Would dissolving solids in the water change its properties?

Each group will write their predictions down on a piece of paper.

 

 Step 3: Evaluate

Have groups use PhET Simulation “Sugar and Solutions” to investigate water conductivity.

Ask students to test if their predictions are correct.

 

 Step 4: Modify

Ask students to create a situation where their new knowledge of water conductivity could be useful.

(The use of Makey-Makeys can be used so students can make an apparatus which physically uses water conductivity to control a computer)

 

 

Step 5: Reflect

Have students revise their original ideas and together formulate the main points of water conductivity.

 

 

References

Friedrichsen, P. M., & Pallant, A. (2007). French fries, dialysis tubing & computer models: Teaching diffusion & osmosis through inquiry & modeling. The American Biology Teacher, 69(2), 22-27.

Khan, S. (2010). New Pedagogies on Teaching Science with Computer Simulations. J Sci Educ Technol, 20(3), 215–232. http://doi.org/10.1007/s10956-010-9247-2

Srinivasan, S., Perez, L. C., Palmer,R., Brooks,D., Wilson,K., & Fowler. D. (2006). Reality versus simulation. Journal of Science Education and Technology, 15 (2), 137-141. http://ezproxy.library.ubc.ca/login?url=http://dx.doi.org/10.1007/s10956-006-9007-5

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