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Fingerprinting: Commercial Products and Elements

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DeeDee Allen and Maria T. Oliver-Hoyo

Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204

J. Chem. Educ., 2002, 79 (4), p 459

DOI: 10.1021/ed079p459

Publication Date (Web): April 1, 2002

Abstract

Correlation between commercial bar codes and element emission spectra gives rise to an activity that relates the familiarity of everyday things to a chemical concept. The analogy between bar codes found in everyday items and absorption-emission spectra emerges from the fact that both contain information in the form of lines and those lines identify a specific product or element. Bar codes are most commonly read by computerized scanners, which obtain a reflectance pattern from the line widths of a bar code. Emission spectra are similar to these reflectance patterns. In the activity entitled "Fingerprinting", students interpret bar code patterns and use the properties of bar code symbols to identify the properties of emission spectra.

Keywords (Audience):

High School / Introductory Chemistry

Keywords (Feature):

Applications and Analogies

Keywords (Pedagogy):

Analogies / Transfer

Keywords (Subject):

Atomic Spectroscopy

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

“Content Coverage” in a Lecture Format versus Activity-Based Instruction
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2011 (), 33-50
- “Content Coverage” in a Lecture Format versus Activity-Based Instruction
  Maria T. Oliver-Hoyo
  2011 (), 33-50
  This chapter addresses the myth that the most time efficient way to “cover content” is lecturing to students. The efforts toward the design, development and implementation of an activity-based instructional format known as cAcL2 (concept Advancement ...
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