A Novel Code System for Revealing Sources of Students' Difficulties with Stoichiometry

Autor/inn/en	Gulacar, Ozcan; Overton, Tina L.; Bowman, Charles R.; Fynewever, Herb
Titel	A Novel Code System for Revealing Sources of Students' Difficulties with Stoichiometry
Quelle	In: Chemistry Education Research and Practice, 14 (2013) 4, S.507-515 (9 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1756-1108
DOI	10.1039/C3RP00029J
Schlagwörter	Stoichiometry; Protocol Analysis; Chemistry; Science Instruction; Undergraduate Students; College Science; Correlation; Scientific Concepts; Problem Solving + Suchen Sie Ihr Suchwort? Stöchiometrie; Chemie; Teaching of science; Science education; Natural sciences Lessons; Naturwissenschaftlicher Unterricht; Korrelation; Problemlösen
Abstract	A coding scheme is presented and used to evaluate solutions of seventeen students working on twenty five stoichiometry problems in a think-aloud protocol. The stoichiometry problems are evaluated as a series of sub-problems (e.g., empirical formulas, mass percent, or balancing chemical equations), and the coding scheme was used to categorize each sub-problem solution as successful, neutral, or unsuccessful, with more detailed codes comprising the neutral and unsuccessful categories, for a total of eight codes. A relatively high frequency of neutral results was found in which students simply did not realize when or how to approach a sub-problem. A lack of conceptual understanding of the mole concept appears to be closely related to students skipping crucial steps in stoichiometry problems, especially the sub-problems stoichiometric ratio and mole concept. Students' failures were also observed to be due to a lack of basic knowledge, such as the names of chemical compounds. The application of the new code system was shown to reveal difficulties that might have otherwise been missed by an analysis that focused on end results only. (As Provided).
Anmerkungen	Royal Society of Chemistry. Thomas Graham House, Science Park, Milton Road, Cambridge, CB4 0WF, UK. Tel: +44-1223 420066; Fax: +44-1223 423623; e-mail: cerp@rsc.org; Web site: http://www.rsc.org/cerp
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01