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Assessing 16-Year-Old Students’ Understanding of Aqueous Solution at Submicroscopic Level

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Abstract

Submicrorepresentations (SMR) could be an important element, not only for explaining the experimental observations to students, but also in the process of evaluating students’ knowledge and identifying their chemical misconceptions. This study investigated the level of students’ understanding of the solution concentration and the process of dissolving ionic and molecular crystals at particulate level, and identifies possible misconceptions about this process. Altogether 408 secondary school students (average age 16.3) participated in the study. The test of chemical knowledge was applied and the analysis of four selected problems related to drawing SMRs in solution chemistry is presented. Selected students were also interviewed in order to gain more detailed data about their way of solving problems comprised in the knowledge test. The average achievement on solution chemistry items was only 43%. It can be concluded from the results that students have different misconceptions about arrangements of solute particles in the solution and presentation of its concentration at particulate level. Students show quite low achievement scores on the problem regarding drawing the SMR of ionic substance aqueous solution (7.6% correct answers) and even lower ones on the problem regarding drawing the SMR of diluted and saturated aqueous solutions of molecular crystal (no completely correct answers). It can be also concluded that many different misconceptions concerning the particulate level of basic solution chemistry concepts can be identified. In the conclusion some implications for teaching to reach a higher level of understanding of solution chemistry are proposed.

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Authors and Affiliations

  1. Faculty of Education, University of Ljubljana, Kardeljeva ploščad 16, Ljubljana, Slovenia

    Iztok Devetak, Janez Vogrinc & Saša Aleksij Glažar

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  1. Iztok Devetak
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  2. Janez Vogrinc
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  3. Saša Aleksij Glažar
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Correspondence to Iztok Devetak.

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Devetak, I., Vogrinc, J. & Glažar, S.A. Assessing 16-Year-Old Students’ Understanding of Aqueous Solution at Submicroscopic Level. Res Sci Educ 39, 157–179 (2009). https://doi.org/10.1007/s11165-007-9077-2

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