The Effect of Argumentation-Supported Problem-Based Learning Method in Teaching Chemical Equilibrium and Le-Chatelier’s Principle

Hatice Güngör Seyhan, Gülseda Eyceyurt Türk

Abstract


This study aims to examine the effects of argumentation-supported problem-based learning (AS-PBL) carried out in the Chemistry-II laboratory course on the conceptual understanding of prospective science teachers about "Chemical equilibrium and Le-Chatelier's principle". The prospective teachers' answers were analyzed using content analysis and the existing misconceptions about the relevant chemistry topics were determined and the effectiveness of the relevant method in eliminating the misconceptions was also examined. The prospective science teachers had fewer scientific arguments in writing grounds for their claims before the treatment using AS-PBL. They were able to use their rebuttal skills more in addition to their claims and grounds after the treatment. Suggestions about problem-based learning supported by argumentation in science laboratory environments were presented to prospective teachers, educators and, readers.


Keywords


argumentation-supported learning; chemical equilibrium; chemistry-II laboratory; prospective science teachers; problem-based learning

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References


Abdullah, A., & Scaife, J. (1997). Using interviews to assess children's understanding of science concepts. School Science Review, 78(285), 79-84.

Abraham, M. R., Gryzybowski, E. B., Renner, J. W., & Marek, A. E. (1992). Understanding and misunderstanding of eighth graders of five chemistry concepts found in textbooks. Journal of Research in Science Teaching, 29(2), 105-120. https://doi.org/10.1002/tea.3660290203

Acar, Ö., Tola, Z., Karaçam, S., & Bilgin, A. (2016). Argümantasyon destekli fen öğretiminin 6. sinif öğrencilerinin kavramsal anlamalarina, bilimsel düşünme becerilerine ve bilimin doğasi anlayişlarina olan etkisi [Effect of argumentation supported science instruction on 6th graders’ understanding of conceptual knowledge, scientific reasoning skills and nature of science]. Abant İzzet Baysal University Journal of the Faculty of Education, 16(3), 730-749. Retrieved from https://dergipark.org.tr/en/pub/aibuefd/issue/24917/263001

Ali, R., Hukamdad, D., Akhter, A., & Khan, A. (2010). Effect of using problem solving method in teaching mathematics on the achievement of mathematics students. Asian Social Science, 6(2), 67-72. Retrieved from https://ccsenet.org/journal/index.php/ass/issue/view/214

Andersson, B. (1986). Pupils' explanations of some aspects of chemical reactions. Science Education, 70(5), 549-563. http://doi.org/10.1002/SCE.3730700508

Ayas, A., & Demirbaş, A. (1997). Turkish secondary students’ conception of introductory chemistry concepts. Journal of Chemical Education, 74(5), 518-521 https://doi.org/10.1021/ed074p518

Aydın, Ö., & Kaptan, F. (2014). Effect of argumentation on metacognition and logical thinking abilities in science – technology teacher candidate education and opinions about argumentation. Journal of Educational Sciences Research, 4(2), 163-188. http://doi.org/10.12973/jesr.2014.42.10

Azizoğlu, N., Alkan, M., & Geban, Ö. (2006). Undergraduate pre-service teachers' understandings and misconceptions of phase equilibrium. Journal of Chemical Education, 83(6), 947. http://doi.org/ 10.1021/ed083p947

Balaydın, H. T., & Altınok, O. (2018). Türkiye’de fen eğitiminde TGA stratejisi: Bir meta sentez [POE strategy in science education in Turkey: A Meta-synthesis]. Recep Tayyip Erdogan University Journal of Social Sciences, 4(8), 427-444. https://doi.org/10.34086/rteusbe.500872

Balım, A. G., İnel-Ekici, D., & Özcan, E. (2016). Concept cartoons supported problem based learning method in middle school science classrooms. Journal of Education and Learning, 5(2), 272-284. http://doi.org/10.5539/jel.v5n2p272

Banta, T. W., Black, K. E., & Kline, K. A. (2000). PBL 2000 plenary address offers evidence for and against problem based learning, PBL Insight: A newsletter for undergraduate Problem Based Learning from Stanford, 3(3), 1-11.

Bar, V., & Travis, A. S. (1991). Children's views concerning phase changes. Journal of Research in Science Teaching, 28(4), 363-382. https://doi.org/10.1002/tea.3660280409

Belland, B. R., Glazewski, K. D., & Richardson, J. C. (2011). Problem-based learning and argumentation: Testing a scaffolding framework to support middle school students’ creation of evidence-based arguments. Instructional Science, 39(5), 667-694. http://doi.org/ 10.1007/s11251-010-9148-z

Bilgin, İ., Uzuntiryaki, E., & Geban, Ö. (2003). Student’s misconceptions on the concept of chemical equilibrium. Education and Science, 29(127), 10-17. Retrieved from http://egitimvebilim.ted.org.tr/index.php/EB/article/view/5118

Bradley, J. D., & Mosimege, M. D. (1998). Misconceptions in acids and bases: A comparative study of student teachers with different chemistry backgrounds. South African Journal of Chemistry, 51(3), 137-145. Retrieved from https://hdl.handle.net/10520/AJA03794350_1436

Canpolat, N., Pınarbaşı, T., Bayrakçeken, S., & Geban, Ö. (2004). Kimyadaki bazı yaygın yanlış kavramalar [Some common misconceptions in chemistry]. Journal of Gazi University Gazi Education Faculty, 24(1). Retrieved from https://dergipark.org.tr/tr/pub/gefad/issue/6760/90936

Coştu, B, Ayas, A, Açıkkar, E, & Çalık, M. (2007). Çözünürlük konusu ile ilgili kavramlar ne düzeyde anlaşılıyor? [At which level are concepts about solubility topic understood?] Bogazici University Journal of Education, 24(2), 13-28. Retrieved from https://dergipark.org.tr/tr/pub/buje/issue/3824/51412

Creswell, J. W. (2012). Educational research: planning, conducting and evaluating quantitative and qualitative research (4. Edition). USA: Pearson Education Inc.

Çalık, M., & Ayas, A. (2005). A comparison of level of understanding of eighth grade students and science student teachers related to selected chemistry concepts. Journal of Research in Science Teaching, 42(6), 638-667. http://dx.doi.org/10.1002/tea.20076

Çalık, M., & Ayas, A. (2008). A critical review of the development of the Turkish science curriculum. In R. K. Coll & N. Taylor (Eds.), Education in context: An international examination of the influence of context on science curricular development and implementation (pp. 161-174). Rotterdam: Sense.

Demi̇rci̇oğlu, H., & Vural, S. (2014). Yapılandırmacı yaklaşımının üstün yetenekli öğrencilerin anlamaları üzerine etkisi: Erime-donma [The effect of constructivist approach on gifted students' understanding: “Melting-freezing”. Dicle University Journal of Ziya Gökalp Education Faculty, 22, 31-50. Retrieved from https://dergipark.org.tr/en/pub/zgefd/issue/47939/606451

Erduran, S., Simon, S., & Osborne, J. (2004). Tapping into Argumentation: Developments in the application of Toulmin’s argument pattern for studying science discourse. Science Education, 88(6), 915-933. https://doi.org/10.1002/sce.20012

Eyceyurt Türk, G., & Kılıç, Z. (2020). The effect of argumentation-supported problem based learning on the achievements of science teacher candidates regarding the subjects of gases and acids-bases. Bartın University Journal of Faculty of Education, 9(2), 440-463. Retrieved from https://dergipark.org.tr/tr/pub/buefad/issue/53032/643630

Eyceyurt Türk, G., & Güngör Seyhan, H. (2022). Evaluation of pre-service science teachers' conceptual understandings on the topic of "colligative properties" according to Walton Argument Model components. International Online Journal of Education and Teaching (IOJET), 9(1). 241-262. Retrieved fromhttps://www.iojet.org/index.php/IOJET/article/view/1561

Fettahlıoğlu, P. (2012). Fen bilgisi öğretmeni adaylarının çevre okuryazarlığının geliştirilmesine yönelik olarak argümantasyon ile probleme dayalı öğrenme yaklaşımının kullanımı [The usage of argumentation-based and problem-based learning approaches intended for developing the environmental literacy of pre-service science teachers]. Unpublished Doctoral Thesis, Institute of Education Sciences, Gazi University, Ankara.

Fortus, D., Krajcik, J., Charles, D., Marx, R. W., & Mamlok-Naaman, R. (2005). Design based science and real-world problem-solving. International Journal of Science Education, 27(7), 855-879. https://doi.org/10.1080/09500690500038165

Garnett, P. J., & Treagust, D. F. (1992). Conceptual difficulties experienced by senior high school students of electrochemistry: Electric circuits and oxidation-reduction equations. Journal of Research in Science Teaching, 29(2), 121-142. https://doi.org/10.1002/tea.3660290204

Gonzalez, F. M. (1997). Diagnosis of Spanish primary school students’ common alternative science concepts. School Science and Mathematics, 97(2), 68-74. https://doi.org/10.1111/j.1949-8594.1997.tb17345.x

Griffiths, A. K., & Preston, K. R. (1992). Grade-12 students' misconceptions relating to fundamental characteristics of atoms and molecules. Journal of Research in Science Teaching, 29(6), 611-628. https://doi.org/10.1002/tea.3660290609

Güneş, F. (2010). Eğitimde yapılandırıcı yaklaşımla gelen yenilikler [Innovations that come with the constructivist approach in education]. Eğitime Bakış [Education Overview], 6(16), 3-9.

Hand, B., & Treagust, D.F. (1991). Student achievement and science curriculum development using a constructive framework. School Science and Mathematics, 91(4), 172-176. https://doi.org/10.1111/j.1949-8594.1991.tb12073.x

Hackling, M. H., & Garnett, P. J. (1985). Misconceptions of chemical equilibrium. European Journal of Science Education, 7(2), 205- 214. https://doi.org/10.1080/0140528850070211

Hazel, E., & Prosser, M. (1994). First-year university students’ understanding of photosynthesis, their study strategies and learning context. The American Biology Teacher, 56(5), 274-279. https://doi.org/10.2307/4449820

Hewson, M. G., & Hewson, P. W. (1983). Effect of instruction using students' prior knowledge and conceptual change strategies on science learning. Journal of Research in Science Teaching, 20(8), 731-743. https://doi.org/10.1002/tea.3660200804

Hsu, L. L. (2004). Developing concept maps from problem-based learning scenario discussions. Journal of Advanced Nursing, 48(5), 510-518. https://doi.org/10.1111/j.1365-2648.2004.03233.x

Inel, D., & Balım, A. G. (2013). Concept cartoons assisted problem based learning method in science and technology teaching and students’ views. Procedia-Social and Behavioral Sciences, 93, 376-380. https://doi.org/10.1016/j.sbspro.2013.09.206

Işcan, Y. V., & Güngör Seyhan, H. (2021). The effect of the 5e learning model supported with material ensuring conceptual change on science achievement: The example of "heat and temperature". Elementary School Forum (Mimbar Sekolah Dasar), 8(3), 250-280. http://doi.org/ 10.53400/mimbar-sd.v8i3.33044

Jiménez-Aleixandre, M. P., & Erduran, S. (2008). Argumentation in science education: An overview. In S. Erduran & M. P. Jiménez-Aleixandre, Argumentation in science education. Perspectives from Classroom-Based Research. pp.11, Dordrecht: Springer

Johnstone, A. H., & Otis, K. H. (2006). Concept mapping in problem based learning: A cautionary tale. Chemistry Education Research and Practice, 7(2), 84-95. https://doi.org/10.1039/B5RP90017D

Kalemkuş, J., Bayraktar, Ş., & Çiftçi, S. (2019). Eğitimde sosyal, zihinsel ve sözlü-yazılı bir aktivite: Argümantasyon [A social, mental and verbal-written activity in education: Argumentation]. Turkish Studies, 14(4), 2449-2467.

Karslı, F., & Çalık, M. (2012). Can freshman science student teachers’ alternative conceptions of “electrochemical cells” be fully diminished? Asian Journal of Chemistry, 24(2), 485-491. Retrieved from https://asianjournalofchemistry.co.in/user/journal/viewarticle.aspx?ArticleID=24_2_3

Kay, J., Barg, M., Fekete, A., Greening, T., Hollands, O., Kingston, J. H. & Crawford, K. (2000). Problem based learning for foundation computer science courses. Computer Science Education, 10(2), 109-128. https://doi.org/10.1076/0899-3408(200008)10:2;1-C;FT109

Kelly, O., & Finlayson, O. (2009). A hurdle too high? Students’ experience of a PBL laboratory module. Chemistry Education Research and Practice, 10(1), 42-52. https://doi.org/10.1039/B901459B

Kılınç, A. (2007). Probleme dayalı öğrenme [Problem-based learning]. Kastamonu Journal of Education, 15(2), 561-578. Retrieved from https://dergipark.org.tr/en/pub/kefdergi/issue/49102/626594

Liew, C. W., & Treagust, D. F. (1994). The effectiveness of predict-observe-explain tasks in diagnosing students’ understanding of science and in identifying their levels of achievement, Paper Presented at the Annual Meeting of the American Educational Research Association, San Diego.

Maskill, R., & Cachapuz, A. F. C. (1989). Learning about the chemistry topic of equilibrium: The use of word association tests to detect developing conceptualizations. International Journal of Science Education, 11(1), 57-69. https://doi.org/10.1080/0950069890110106

McGhee, M. (2015). The effects of argumentation scaffolding in a problem-based learning course on problem-solving outcomes and learner motivation. Doctoral Dissertation. The Florida State University.

Meşeci, B., Tekin, S., & Karamustafaoğlu, S. (2013). Maddenin tanecikli yapisiyla ilgili kavram yanilgilarinin tespiti [Detection of misconceptions about the particulate nature of matter]. Dicle University Social Sciences Institute Journal, 9, 20-40. Retrieved from https://dergipark.org.tr/en/pub/diclesosbed/issue/61616/920133

Nakhleh, M.B. (1992). Why some students don’t learn chemistry: Chemical misconceptions. Journal of Chemical Education, 69(3), 191. https://doi.org/10.1021/ed069p191

Nakhleh, M. B., & Krajcik, J. S. (1994). Influence of levels of information as presented by different technologies on students’ understanding of acid, base, and pH concepts. Journal of Research in Science Teaching, 34(10), 1077-1096. Retrieved November 6, 2022 from https://www.learntechlib.org/p/78151/

Nussbaum, E. M., & Edwards, O. V. (2011). Critical questions and argument stratagems: A framework for enhancing and analyzing students’ reasoning practices. The Journal of the Learning Sciences, 20(3), 443-488. https://doi.org/10.1080/10508406.2011.564567

Okur, M., & Güngör Seyhan, H. (2021). Effect of the argumentation-supported PBL on the determination of pre-service science teachers' misconceptions about the particulate, space, and motion nature of matter. International Online Journal of Educational Sciences, 13(4), 1069-1088. https://doi.org/10.15345/iojes.2021.04.009

Osborne, R. J., & Cosgrove, M. M. (1983). Children's conceptions of the changes of state of water. Journal of Research in Science Teaching, 20(9). 825-838. https://doi.org/10.1002/tea.3660200905

Osborne, R. J., & Gilbert, J. A. (1980). A method for investigating concept understanding in science. European Journal of Science Education, 2(3), 311-321. https://doi.org/10.1080/0140528800020311

Osborne, R. J., Simon, S., & Collins, S. (2003). Attitudes towards science: A review of the literature and its implications. International Journal of Science Education, 25(9), 1049-1079. https://doi.org/10.1080/0950069032000032199

Öğreten, B., & Uluçınar Sağır, Ş. (2014). Argümantasyona dayalı fen öğretiminin etkililiğinin incelenmesi [Examining the effectiveness of argumentation-based science teaching]. Journal of Turkish Science Education, 11(1), 75-100. http://doi.org/ 10.12973/tused.10104a

Öğünç, A. (2012). Kimya dersi 'reaksiyon hızları ve kimyasal denge' ünitesiyle ilgili yapılandırmacı yaklaşıma dayalı bir aktif öğrenme materyalinin geliştirilmesi, uygulanması ve değerlendirilmesi [Development, application and evaluation of an active learning material based on constructivism related to 'reaction rates and chemical equilibrium' subject in chemistry lesson], Unpublished Doctoral Dissertation. Dokuz Eylül University, İzmir.

Özeken, Ö. F., & Yıldırım, A. (2011). Asit-baz konusunun öğretiminde probleme dayalı öğrenme yönteminin fen bilgisi öğretmen adaylarının akademik başarıları üzerine etkisi [The effect of problem-based learning method on the academic success of pre-service science teachers in teaching acid-base subject]. Journal of Pegem Education and Teaching, 1(1), 33-38. Retrieved from https://dergipark.org.tr/en/pub/pegegog/issue/22596/241352

Özmen, H., & Demircioğlu, G. (2003). Asitler ve bazlar konusundaki öğrenci yanlış anlamalarının giderilmesinde kavram değişim metinlerinin etkisi [The effect of conceptual change texts on the evaluation of student misunderstandings on acids and bases]. Milli Eğitim Dergisi, 159, 111-119. Retrieved from http://dhgm.meb.gov.tr/Yayimlar/dergiler/Milli_Egitim_Dergisi/159/ozmen-demircioglu.htm

Peterson, R. F., & Treagust, D. F. (1998). Learning to teach primary science through problem-based learning. Science Education, 82(2), 215-237. https://doi.org/10.1002/(SICI)1098-237X(199804)82:2<215::AID-SCE6>3.0.CO;2-H

Piquette, J. S., & Heikkinen, H. W. (2005). Strategies reported used by instructors to address student alternate conceptions in chemical equilibrium. Journal of Research in Science Teaching, 42(10), 1112-1134. https://doi.org/10.1002/tea.20091

Sağlam, O. (2022). Argümantasyon destekli probleme dayali öğrenme yönteminin 8. sınıf "basit makineler" konusunun öğretimine etkisi [The effect of the argumentation-supported problem-based learning method on the teaching of the topic of 8th grade 'simple machines']. Unpublished Masters’ Thesis, Institute of Education Sciences, Sivas Cumhuriyet University, Sivas, Türkiye.

Sisovic, D., & Bejovic, S. (2000). Approaching the concepts of acids and bases by cooperative learning. Chemistry Education: Research and Practice in Europe, 1, 263–75. https://doi.org/10.1039/A9RP90027F

Smith, J. K., & Metz, P. A. (1996). Evaluating student understanding of solution chemistry through microscopic representations. Journal of Chemical Education, 73(3), 233-235. https://doi.org/10.1021/ed073p233

Şahin, C., & Çepni, S. (2011). “Yüzme-batma, kaldırma kuvveti ve basınç” kavramları ile ilgili iki aşamalı kavramsal yapılardaki farklılaşmayı belirleme testi geliştirilmesi [The transformation of two-tier test into four-tier test on Newton’s laws concept]. Journal of Turkish Science Education, 8(1), 111-118. Retrieved from http://www.tused.org/index.php/tused/article/view/548

Şenocak, E., Taşkesenligil, Y., & Sözbilir, M. (2007). A study on teaching gases to prospective primary science teachers through problem-based learning. Research in Science Education, 37(3), 279-290. http://doi.org/10.1007/s11165-006-9026-5

Taber, K. S. (1999). Ideas about ionization energy: A diagnostic instrument. School Science Review, 81(295), 97-104. Retrieved from https://www.academia.edu/588153/Ideas_about_ionisation_energy_a_diagnostic_instrument

Tatar, E., Oktay, M., & Tüysüz, C. (2009). Kimya eğitiminde probleme dayalı öğrenmenin avantaj ve dezavantajları: Bir durum çalışması [Advantages and disadvantages of problem-based learning in chemistry education: A case study]. Erzincan University Journal of Education Faculty, 11(1), 95-110. Retrieved from https://dergipark.org.tr/en/pub/erziefd/issue/6002/80040

Tezel, Ö. (2018). From the editor. Eskişehir Osmangazi University Turkish World Application and Research Center Education Journal, 3(1).

Tezel, Ö., & Yaman, H. (2017). [FeTeMM eğitimine yönelik Türkiye’de yapılan çalışmalardan bir derleme] A review of studies on STEM education in Turkey. Journal of Research in Education and Teaching, 6(1), 146-160. Retrieved from http://www.jret.org/?pnum=53&pt=+2017+C%C4%B0LT+6+%C3%96ZEL+SAYI+1

Topçu, M. S., & Atabey, N. (2017). Sosyobilimsel konu içerikli alan gezilerinin ilköğretim öğrencilerinin argümantasyon nitelikleri üzerine etkisi [The effect of socio-scientific issues based field trips on elementary school students’ argumentation quality]. Bartın University Journal of Faculty of Education, 6(1), 68-84. https://doi.org/10.14686/buefad.263541

Torp, L., & Sage, S. (2002). Problems as possibilities: Problem-based learning for K-16 education (2nd ed.). Alexandria, VA: Association for Supervision and Curriculum Development.

Tosun, C., Tatar, E., Şenocak, E., & Sözbilir, M. (2015). Problem-based teaching practices in chemistry teaching. In A. Ayas & M. Sözbilir (Ed.), Chemistry Teaching (p.171-194). Ankara. Pegem Publishing.

Tüysüz, C. (2009). Development of two-tier diagnostic instrument and assess students’ understanding in chemistry. Scientific Research and Essays, 4(6), 626–631. https://doi.org/10.5897/SRE.9000351

Ulu, C., & Bayram, H. (2014). Araştırma sorgulamaya dayalı bilim yazma araci kullanımının üstbilisel bilgi ve becerilere etkisi [Effects of implementing inquiry based approach known as the science writing heuristic on metacognitive awareness and skills]. Turkish International Journal of Special Education and Guidance & Counselling (TIJSEG), 3(1), 68-80. Retrieved from https://www.tijseg.org/index.php/tijseg/issue/view/14

White, R., & Gunstone, R. (1992). Probing understanding. Hong Kong: Graphicraft Typetters Ltd.

Yavuz, S., & Büyükekşi, C. (2011). Kavram karikatürlerinin ısı-sıcaklık kavramlarının öğretiminde kullanılması [Usage of concept cartoons in teaching of heat-temperature topic]. Karaelmas Science and Engineering Journal, 1(2), 25-30. Retrieved from https://dergipark.org.tr/en/pub/karaelmasfen/issue/57132/806071

Yavuz, S., & Çelik, G. (2013). Sınıf öğretmenliği öğrencilerinin gazlar konusundaki kavram yanılgılarına tahmin et-gözle-açıkla tekniğinin etkisi. Karaelmas Journal of Educational Sciences, 1(1), 1-20. Retrieved from https://dergipark.org.tr/tr/pub/kebd/issue/67213/1049065

Yeo, S., & Zadnik, M. (2001). Introductory thermal concept evaluation: Assessing students' understanding. The Physics Teacher, 39(8), 496-504. https://doi.org/10.1119/1.1424603

Yıldırım, C. (2017). Argümantasyon destekli probleme dayalı öğrenmenin öğrencilerin sorgulayıcı öğrenme ile problem çözme becerilerine ve kavramsal anlamlarına etkisi. [The effects of argumentation supported problem based learning on students' inquiry learning skills and problem solving skills and levels of conceptual understanding]. Doctoral Thesis. Pamukkale University, Institute of Education Sciences, Denizli.

Yıldırım, N., Ayas, A., & Küçük, M. (2013). A comparison of effectiveness of analogy-based and laboratory-based instructions on students' achievement in chemical equilibrium. Scholarly Journal of Education, 2(6), 63-76.

Yıldırım, A, & Şimşek, H. (2013). Qualitative research methods in the social sciences. Ankara: Seçkin Publishing

Yıldırır, H. E., & Nakiboğlu, C. (2014). Kimya öğretmen ve öğretmen adaylarinin derslerinde kullandiklari argümantasyon süreçlerinin incelenmesi [Examination of chemistry teachers and pre-service teachers’ argumentation processes used in their courses]. Abant İzzet Baysal University Journal of the Faculty of Education, 14(2), 124-154. https://doi.org/10.17240/aibuefd.2014.14.2-5000091531

Yılmaz, A., Erdem, E., & Morgil, F. İ. (2002). Öğrencilerin elektrokimya konusundaki kavram yanılgıları [Students' misconceptions concerning electrochemistry]. Journal of Hacettepe University Faculty of Education, 23, 234-242. Retrieved from http://www.efdergi.hacettepe.edu.tr/cilt-sayi-23-yil-2002.html

Zoller, U. (1990), Students’ misunderstandings and misconceptions in college freshman chemistry (general and organic). Journal of Research in Science Teaching, 27(10), 1053-1065. https://doi.org/10.1002/tea.3660271011




DOI: https://doi.org/10.53400/mimbar-sd.v9i3.45585

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