Transformations in Matter and Energy

Students will use a simulation to explore the ideas in Activity 4.1 at a larger scale.

Print one copy of 4.2 Computer Model for Constant Flux Worksheet for each student. Prepare computers for each student or pair of students to run the simulation.

Show Slide 2 of the 4.2 Carbon Pools and Constant Flux Simulation PPT.

Show Slide 3 of the 4.2 Carbon Pools and Constant Flux Simulation PPT. Have students discuss the patterns they found in Activity 4.1 and review the idea of net flux.

Show Slide 4 of the 4.2 Carbon Pools and Constant Flux Simulation PPT. Pass out a 4.2 Computer Model for Constant Flux Worksheet to each student. Have students read until #1 for an overview of the simulation.

Show Slide 5 and open the simulation. Show students how to move the sliders and run an example. Point out the graphs and how they can slide the line of the graph to get data for a particular point in time.

Have students follow the instructions to run the simulation. Students should record their data in the table.

(Optional) Use slide 6 and 7 to discuss Run 1 and Run 2 as a class.

When students have completed the table, have students work individually and then with a partner to answer questions 6 and 7 on 4.2 Computer Model for Constant Flux Worksheet.

(Optional) Use slide 8 to complete the table as a class.

Show Slide 9 of 4.2 Carbon Pools and Constant Flux Simulation PPT. Have students share and discuss their answers to questions 6 and 7.

Show slide 10. Discuss with students how the rules from Activity 4.1 in the tiny system also are true of the larger system in the simulation.

During the discussion after the simulation, be sure that students recognize that the patterns are the same as in Activity 4.1 even though there is a larger number of atoms in the system. Use 4.2 Grading the Computer Model for Constant Flux Worksheet to grade students' work.