Reaktionsprozesse haptisch begreifen : Entwicklung und Untersuchung eines neuartigen gegenständlichen 3D-Modells zur Darstellung des SN2-Reaktionsmechanismus für blinde und sehbeeinträchtigte Lernende in der Organischen Chemie
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Philipps-Universität Marburg
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Abstract
For blind and visually impaired people, access to science and thus to organic chemistry is considerably more difficult – both due to the practical laboratory work and the high proportion of visually presented content. Using structural-energetic accounts to predict the outcome of reaction processes via mechanistic reasoning is central to the theoretical work of organic chemistry. It is primarily based on visually accessible structural formulas and places high demands on spatial thinking. Blind and visually impaired learners can access the structural formulas via touch through various haptic adaptations. However, when using these adaptations, blind and visually impaired learners often face high cognitive loads due to the haptic approach and the often less developed spatial abilities. Added to this are the cognitive requirements resulting from the interpretation of the structural formulae. These, in comparison to sighted learners, increased cognitive demands for blind and visually impaired learners can quickly lead to cognitive overload and significantly hinder successful learning.
In order to support blind and visually impaired learners in accessing reaction processes and to moderate the resulting cognitive requirements in this process, an innovative concrete 3D model was developed. The so-called 3D process model is able to present the dynamics of structural and energetic changes of nucleophilic substitution reactions following the SN2 reaction mechanism in an explicit and haptically tangible way. The model thus addresses the special needs of blind and visually impaired learners in organic chemistry and allows for moderating the cognitive demands that arise during mechanistic reasoning for blind, visually impaired and sighted learners. To visualize the dynamic reaction process the 3D process model uses especially developed mechanics with movable and magnetically bound components, to make the structural and energetic changes of the reaction explicit and haptically tangible. The developed model design and its applicability for the description and interpretation of SN2 reaction processes in settings with blind and visually impaired learners could be validated within a qualitative study design. By explicitly representing the structural-energetic course of the modeled reaction process and by that making it more accessible, the 3D process model can produce a focus on aspects that particularly address spatial thinking and are therefore associated with increased cognitive demands for blind and visually impaired learners. The described model design can be used as a basis for the development of further concrete 3D-models, with which further reaction processes can be represented in a haptically tangible way.
The developed 3D process model thus represents a successful approach to supporting the inclusion of blind and visually impaired learners in organic chemistry.
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Dates
Created: 2025Issued: 2025-04-03Updated: 2025-04-07
Faculty
Fachbereich Chemie
Publisher
Philipps-Universität Marburg
Language
ger
Data types
DoctoralThesis
Keywords
ReaktionsprozesseInklusive Lerngegenstände für Blinde und Sehbeeinträchtigte, Didaktik der Organischen Chemie
DFG-subjects
DidaktikOrganische ChemieInklusionBlindheitSehbeeinträchtigung3D-Modelle
DDC-Numbers
540
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Lindenstruth, Philipp Konrad: Reaktionsprozesse haptisch begreifen : Entwicklung und Untersuchung eines neuartigen gegenständlichen 3D-Modells zur Darstellung des SN2-Reaktionsmechanismus für blinde und sehbeeinträchtigte Lernende in der Organischen Chemie. : Philipps-Universität Marburg 2025-04-03. DOI: https://doi.org/10.17192/z2025.0101.
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This item has been published with the following license: In Copyright