"Sticky Ions": A Student-Centered Activity Using Magnetic Models to Explore the Dissolving of Ionic Compounds

Autor/inn/en	Ryan, Sheila; Herrington, Deborah G.
Titel	"Sticky Ions": A Student-Centered Activity Using Magnetic Models to Explore the Dissolving of Ionic Compounds
Quelle	In: Journal of Chemical Education, 91 (2014) 6, S.860-863 (4 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0021-9584
DOI	10.1021/ed300607a
Schlagwörter	Leitfaden; Unterricht; Lehrer; Chemistry; Science Activities; Science Instruction; Magnets; Models; Molecular Structure; Water; Misconceptions; Equations (Mathematics); Instructional Effectiveness; Secondary School Science; College Science; High School Students; College Students + Suchen Sie Ihr Suchwort? Lesson concept; Instruction; Unterrichtsentwurf; Unterrichtsprozess; Teacher; Teachers; Lehrerin; Lehrende; Chemie; Teaching of science; Science education; Natural sciences Lessons; Naturwissenschaftlicher Unterricht; Stabmagnet; Analogiemodell; Wasser; Missverständnis; Equations; Mathematics; Gleichungslehre; Unterrichtserfolg; High school; High schools; Student; Students; Oberschule; Schüler; Schülerin; Studentin; Collegestudent
Abstract	Understanding what happens at the particulate level when ionic compounds dissolve in water is difficult for many students, yet this understanding is critical in explaining many macroscopic observations. This article describes a student-centered activity designed to help strengthen students' conceptual understanding of this process at the particulate level and translate this understanding to the symbolic level. In this activity, students use magnetic models to explore how mono- and polyatomic ions interact with water molecules and with each other. Manipulating the models addresses the common students' misconceptions (1) that ionic compounds remain as ion pairs and (2) that polyatomic ions dissociate into individual monatomic ions. These models also help students see how water molecules orient around the individual ions. Writing dissociation reaction equations for the modeled dissolving processes helps students better understand the relationship between subscripts and coefficients in writing ionic equations. Post-test and final exam scores on questions related to the particulate and symbolic representations of the dissolving of ionic compounds show improved and retained understanding of this concept. (As Provided).
Anmerkungen	Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10