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The need to identify the carbon dioxide pressure – taking CaCO3 as an example
Mälardalens högskola, Akademin för utbildning, kultur och kommunikation, Utbildningsvetenskap och Matematik.ORCID-id: 0000-0002-5823-1472
2013 (Engelska)Konferensbidrag, Muntlig presentation med publicerat abstract (Refereegranskat)
Abstract [en]

Equilibrium reactions are of fundamental importance in chemistry and validity is a key concern in research. Here, a previous used research task was further developed in order to investigate how undergraduate students describe why no calcium oxide is formed when the carbon dioxide pressure exceeds the partial pressure given by the equilibrium constant. The aim of this pilot study was to begin the validation of some of the original research findings. Two groups of students participated. The first group (n=17) took their first chemistry course and answered exam question. The second group (n=7) took a course in chemical thermodynamics and answered hand ins (part of course credit). Data was analyzed iterative and descriptive categories regarding data from the exam were constructed. These categories were used to analyze the data from the hand ins but new categories were also developed. The final step was to merge all the developed descriptive categories. The result shows that in the first group 18 % (3/17) correctly identified the carbon dioxide pressure as too high, whereas 57 % (4/7) in the second group either identified the carbon dioxide as too high or used ΔG. Also, 41 % (7/17) and 14 % (1/7) left blank answers despite the course credit. The incorrect answers in each group 41 % (7/17) and 28 % (2/7) were categorized with different categories, hence in general there seems to be a difference in how the groups described why no calcium carbonate is formed. The results give some implications for the original study, but the small sample size must be addressed in the future as well as the data collection methods.

Ort, förlag, år, upplaga, sidor
2013.
Nationell ämneskategori
Didaktik
Forskningsämne
naturvetenskapernas och teknikens didaktik
Identifikatorer
URN: urn:nbn:se:mdh:diva-21673OAI: oai:DiVA.org:mdh-21673DiVA, id: diva2:651618
Konferens
ESERA13
Tillgänglig från: 2013-09-26 Skapad: 2013-09-26 Senast uppdaterad: 2015-12-22Bibliografiskt granskad

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Nilsson, Tor

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Totalt: 47 träffar
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