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Fen Bilimleri Ogretmen Adaylarinin Stokiyometri Problemlerinin Cozumunde Kullandiklari Stratejilerin Orantisal Akil Yurutme Acisindan İncelenmesi
2019
Journal:  
Çukurova Üniversitesi Eğitim Fakültesi Dergisi
Author:  
Abstract:

Orantısal akıl yürütmenin doğru sonuca ulaşmayı sağladığı stokiyometri problemleri kimya eğitiminde problem çözmenin en iyi örneklerinden biridir. Kavramsal problem çözmenin önemi ve faydaları göz önüne alınarak, stokiyometri problemlerine ilişkin çözümlerin doğruluğunun yanı sıra nasıl bir yaklaşımla çözüldüğünün de incelenmesi gerekmektedir. Bu amaçla araştırmada nitel araştırma yöntemlerinden bütüncül çoklu durum kullanılmıştır. Çalışmada, 37 fen bilgisi öğretmen adayının stokiyometri problemlerine ilişkin çözümleri (i) tepkimeleri doğru denkleştirilip denkleştirilmediği, (ii) çözümlerin doğruluğu ve (iii) problem çözümünde kullanılan stratejiler olmak üzere üç adımda incelenmiştir. Öğretmen adaylarının yarısından fazlasının tepkimeleri doğru denkleştirdiği ancak denkleştirilmiş tepkimelerdeki katsayıları doğru yorumlayamadığı görülmüştür. Öğretmen adayları algoritmik yaklaşımı orantısal muhakeme stratejilerinden daha fazla kullanmayı tercih etmiştir.  Soruların karmaşıklık düzeyi arttıkça öğretmen adaylarının problemleri doğru çözme ve algoritmik yaklaşımı kullanma oranları azalmıştır. Öğretmen adaylarının stokiyometri problemlerini çözerken tepkimelerdeki katsayıların belirttiği molar oranı tam olarak anlamlandıramadığı, tepkimeye giren maddelerden biri yoğunluk gibi intensif bir birim cinsinden verildiğinde çözüme ulaşamadıkları ve birimleri doğru dönüştüremedikleri gözlemlenmiştir. Öğretmen adayları stokiyometri problemlerini daha önceki derslerinde nasıl çözmeyi öğrenmiş iseler yine aynı şekilde çözmeyi tercih ettikleri düşünülmektedir. Bulgular çerçevesinde, kimyasal tepkime problemlerinden önce katsayıların ne anlama geldiği ile ilgili kavramsal desteğin sağlanması, problem çözümüne orantısal akıl yürütme stratejileri ile başlanarak bu desteğin işlemsel süreç ile pekiştirilmesi önerilmiştir.

Keywords:

Examining Strategies Used By Pre-service Science Teachers In Stoichiometry Problems In Terms Of Proportional Reasoning
2019
Author:  
Abstract:

Stokiyometry problems where the conduct of the proportional mind allows to the right outcome are one of the examples of the problem solving in chemical education. Given the importance and benefits of the concept problem solving, the accuracy of the solutions related to the stokiyometry problems, as well as how the approach is solved, should be examined. For this purpose, a comprehensive variety of research methods have been used in research. In the study, 37 science knowledge teacher's candidate's solutions to stokiyometry problems were studied in three stages: (i) the reactions were correctly balanced or not balanced, (ii) the accuracy of the solutions and (iii) the strategies used in problem-solving. More than half of the teaching candidates found that they equated the responses correctly but did not interpret the ratio in the equated responses correctly. Teacher candidates have preferred to use the algorithmic approach more than proportional judgment strategies.  As the level of complexity of questions increased, the rates of teacher candidates to correctly solve problems and use algorithmic approach have decreased. The teaching candidates are not able to understand the molar ratio indicated by the indicators in the reactions while solving the stokiyometry problems, one of the reactive substances is not able to reach the solution when given from an intense unit, such as intensity, and they are not able to correctly convert the units. Teachers candidates are believed to prefer to solve the same way if they have learned how to solve the stokiyometry problems in their previous classes. In the framework of the findings, the provision of conceptual support on what the ratio means before the chemical reaction problems, starting with the strategies of the rationalization of the problem, is proposed to strengthen this support by the processing process.

Keywords:

Examining Strategies Used By Pre-service Science Teachers In Stoichiometry Problems In Terms Of Proportional Reasoning
2019
Author:  
Abstract:

Stoichiometry problems are one of the best examples of problem solving in chemistry education. Proportional reasoning supports correct answers in stoichiometry 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. This study utilizes the embedded multiple case study design. The stoichiometry problem solutions of 37 pre-service science teachers (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 conceptually about the meanings of integers and should be introduced using proportional reasoning in problem solving prior to algorithms.

Keywords:

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Çukurova Üniversitesi Eğitim Fakültesi Dergisi

Field :   Eğitim Bilimleri

Journal Type :   Ulusal

Metrics
Article : 430
Cite : 834
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