Activity Number
85
Not Editable
Important Notice!
Overview and Learning Objectives
Assessment
Central Concepts
Textbook References
Benchmarks and Standards
Extensions and Connections
Macro Micro Link
Activity Credits
Requirements

Mass Spectroscopy (a 5-page activity for advanced technical students)

Interactive, scaffolded model

Activity Screenshot

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  • Java 1.4+ - Java 1.4+ is available for Windows, Linux, and Mac OS X 10.3 and greater.

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Overview and Learning Objectives

The activity offers students an opportunity to manipulate the central variables in mass spectroscopy, which operates on the principle that moving ions may be deflected by a magnetic field and hence identified. This model demonstrates how the force exerted on each ion depends upon the strength of the magnetic field, the velocity with which the ion is moving, and its charge.

Students will be able to:

• separate the moving ions according to their mass-to-charge ratios;

• explain the role of the magnetic field in the deflection of moving ions;

• explain why the angle of deflection is proportional to the mass-to-charge ratio.

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Assessment

Pre-post Test:

http://www.concord.org/~barbara/workbench_web/pdf/mass_spec_assess3.pdf

RUBRIC

http://www.concord.org/~barbara/workbench_web/pdf/mass_spec_rubric_8.6.07bt.pdf

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Central Concepts

Key Concept:

The angle of deflection in a mass spectrometer is proportional to the substance's mass-to-charge ratio.

Additional Related Concepts

Biology

  • Sickle Cell Anemia

Physics/Chemistry

  • Charge
  • Ion
  • Magnetism
  • Mass

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Textbook References

  • Cell Biology (Pollard and Earnshaw) Saunders 2002 - Chapter Five: Research Strategies

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Benchmarks and Standards

NSES

  • Physical-Science: Energy/Matter Interactions - 2 Electromagnetic waves result when a charged object is accelerated or decelerated (Full Text of Standard)

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Extensions and Connections

Go to http://www.chemguide.co.uk/analysis/masspec/elements.html

to see examples of mass spectra of elements.

To see uses of mass spectroscopy, visit

http://www.dartmouth.edu/~cehs/indexTE.html

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Macro Micro Link

http://www.skipwagner.net/smbiotech/samples/friendlytext.htm

A good general, though high level (AP or higher) introduction.

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Activity Credits

Created by CC Project: CCATOMS using Molecular Workbench + Pedagogica

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Requirements

  • Java 1.4+ - Java 1.4+ is available for Windows, Linux, and Mac OS X 10.3 and greater.

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NSF Logo
These materials are based upon work supported
by the National Science Foundation under grant numbers
9980620, ESI-0242701, EIA-0219345, DUE-0402553, and 0628181.

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.