Linking the representation levels to a physical separation and purification method in chemistry: Understanding of distillation experiment
| Autor: | Melis Arzu Uyulgan, Nalan Akkuzu Güven |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Class (computer programming)
business.product_category Data collection distillation Primary education primary pre-service school teachers Education (General) Science education law.invention macroscopic level Education sub-microscopic level law symbolic level Mathematics education science education L7-991 business Representation (mathematics) Distillation Curriculum Worksheet |
| Zdroj: | Journal of Pedagogical Research, Vol 5, Iss 3, Pp 80-104 (2021) |
| Popis: | The present investigation aims to analyze the knowledge levels and chemical representation levels of preserviceprimary school teachers (PPSTs) on the experiment of distillation. For this purpose, the crosssectionalsurvey technique, one of the quantitative research designs was employed. The study was carriedout at a Faculty of Education in the Aegean Region of Turkey with 79 freshman pre-service teachersenrolled in the Department of Primary Education. This group is of particular interest as they are the lastclass who had taken the General Chemistry course since this course was removed from the curriculum in2018. A Distillation Experiment Worksheet (DEW), which consisted of 9 open-ended questions involvingthe macroscopic, sub-microscopic, and symbolic representations was used as data collection instrument inthe study. The worksheets were analyzed with the document analysis method according to the categoriescreated within the scope of the chemical representation levels, and these categories were established in linewith direct statements of the PPSTs. Results indicated that PPSTs confused the heterogeneous andhomogeneous mixtures, physical properties such as volatility and density, and they were unable todifferentiate between boiling and evaporation. The most crucial result of the study was that the PPSTs haddifficulties in establishing a relationship between macroscopic and sub-microscopic representations. Forthis reason, they could not demonstrate the interactions between solvent and solute molecules at the submicroscopiclevel during molecular dissolution and they could not predict how the intermolecularinteraction changes during the condensation and the distance between the particles. Based on the results ofthis analysis, our study provides several recommendations for lecturers in the last part of this paper. |
| Databáze: | OpenAIRE |
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