Activity Number 28
Not Editable
	Important Notice!
	Overview and Learning Objectives
	Assessment
	Classroom Practice
	Central Concepts
	Textbook References
	Benchmarks and Standards
	Activity Credits
	Requirements
	Technical Notes

Gas Diffusion: On Your Marks, Get Set, Go!

Interactive, scaffolded model

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This Activity Requires:

Java 1.5+ - Java 1.5+ is available for Windows, Linux, and Mac OS X 10.4 and greater. If you are using Mac OS X 10.3, you can download MW Version 1.3 and explore within it instead.
Windows only

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	Important Notice! The activity will work properly on Windows and OS 10.4+ with Java 5.0 updates installed. return to top



	Overview and Learning Objectives Students experiment with a computer model to determine how mass affects diffusion of various gasses in a glass tube. Students will be able to: determine how mass of different gasses affects diffusion; predict the approximate location of a precipitate formed between gasses diffusing from opposite ends of a tube. return to top



	Assessment See questions 1 and 2 from the following pre/post-test: http://www.concord.org/~barbara/workbench_web/unit1/prepost_atoms.html return to top



	Classroom Practice This activity is one of a larger module: Atoms in Motion (http://www.concord.org/~barbara/workbench_web/unit1/index.html). In the context of the module, students will: interpret the results of actual and simulated experiments and describe why those results occurred; predict the approximate location of a precipitate formed between gasses diffusing from opposite ends of a tube. return to top



	Central Concepts Key Concept: If mixed together, molecules with various masses will move at different speeds related to their mass. Additional Related Concepts Biology Waste Disposal Physics/Chemistry Collision Diffusion Gas Gradient Kinetic motion Random kinetic motion Systems Equilibrium return to top



	Textbook References Biology (Miller and Levine) Prentice Hall 5th Edition - Unit 9 (Human Biology) Chapter 40 - Repiratory System Biology: Exploring Life - Chapter 5: The Molecules of Life BSCS Blue (8th Edition) - Chapter 1: The Chemistry of Life Web of Life - Chapter 2: Chemical Basis of Life return to top



	Benchmarks and Standards NSES Life-Science: Matter, energy, and organization - 1 All matter tends toward more disorganized states (Full Text of Standard) Physical-Science: Atomic Structure - 1 Matter is made of minute particles (Full Text of Standard) Physical-Science: Energy Conservation / Entropy - 4 Everything tends to become less organized and less orderly over time (Full Text of Standard) Physical-Science: Matter Structure/Properties - 4 The physical properties of compounds reflect the nature of the interactions (Full Text of Standard) Physical-Science: Motions and Forces - 1 Objects change their motion only when a net force is applied (Full Text of Standard) return to top



	Activity Credits Created by CC Project: Molecular Workbench using Molecular Workbench + Pedagogica return to top



	Requirements Java 1.5+ - Java 1.5+ is available for Windows, Linux, and Mac OS X 10.4 and greater. If you are using Mac OS X 10.3, you can download MW Version 1.3 and explore within it instead. Windows only return to top



	Technical Notes Because of a problem with Flash, this does not currently work on most Macs. return to top

These materials are based upon work supported by the
National Science Foundation under grant number DUE-0402553

Any opinions, findings, and conclusions
or recommendations expressed in this material are those of
the author(s) and do not necessarily reflect the views
of the National Science Foundation.

Gas Diffusion: On Your Marks, Get Set, Go!

Important Notice!

Overview and Learning Objectives

Assessment

Classroom Practice

Central Concepts

Additional Related Concepts

Textbook References

Benchmarks and Standards

Activity Credits

Requirements

Technical Notes