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Examining strategies used by pre-service science teachers in stoichiometry problems in terms of proportional reasoning      
Yazarlar
Doç. Dr. Tezcan KARTAL
Kırşehir Ahi Evran Üniversitesi, Türkiye
Doç. Dr. Büşra KARTAL
Kırşehir Ahi Evran Üniversitesi, Türkiye
Özet
Stoichiometry problems are one of the best examples of problem solving in chemistry education.Proportionalreasoningsupportscorrectanswersinstoichiometry problems. It is needed to examine how these problems are solved as well as the accuracy of solutions because of the importance and benefits of conceptual problem solving.Thisstudyutilizestheembeddedmultiplecasestudydesign.The stoichiometryproblemsolutionsof37pre-servicescienceteachers(PSTs)were examined based on three units of analysis; (i) whether pre-service teachers balanced the equations correctly or not, (ii) the accuracy of solutions, and (iii) strategies used to solve problems. More than half of the PSTs balanced the equations correctly but most of them did not interpret the integers in the equations appropriately. Participants were inclined to use algorithmic approach more than proportional reasoning. The accuracy of solutions and the frequency of algorithmic approach increased while the complexity of problems decreased. PSTs had difficulties in making sense of integers of chemical reactions, using intensive units such as density, and converting units. It is thought that PSTs prefer to use strategies that they learnt in their prior learning experiences. Within the context of findings, we suggest that PSTs should be supported conceptuallyaboutthemeaningsofintegersandshouldbeintroducedusing proportional reasoning in problem solving prior to algorithms.
Anahtar Kelimeler
Stoichiometry problems, proportional reasoning, pre-service science teachers
Makale Türü Özgün Makale
Makale Alt Türü ESCI dergilerinde yayımlanan tam makale
Dergi Adı Çukurova University Faculty of Education Journal
Dergi ISSN 2149-116X
Dergi Tarandığı Indeksler ESCI
Makale Dili İngilizce
Basım Tarihi 04-2019
Cilt No 48
Sayı 1
Sayfalar 910 / 944
Doi Numarası 10.14812/cufej.491826
Makale Linki chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://dergipark.org.tr/en/download/article-file/704116
BM Sürdürülebilir Kalkınma Amaçları
Atıf Sayıları
WoS 1
TRDizin 1
Google Scholar 6
Examining strategies used by pre-service science teachers in stoichiometry problems in terms of proportional reasoning

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