MENTAL MODEL OF PROSPECTIVE CHEMISTRY TEACHER ON EQUILIBRIUM CONSTANT AND DEGREE OF DISSOCIATION
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MODEL MENTAL CALON GURU KIMIA PADA KONSEP TETAPAN KESETIMBANGAN DAN DERAJAT DISOSIASI
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Penelitian ini bertujuan untuk mengeksplorasi model mental calon guru kimia pada konsep tetapan kesetimbangan dan derajat disosiasi. Penelitian ini menggunakan jenis penelitian kualitatif eksploratif. Penelitian dilaksanakan pada mahasiswa semester lima di Program Studi Pendidikan Kimia Universitas Riau. Hasil penelitian menunjukkan bahwa model mental mahasiswa sebagai calon guru kimia pada konsep tetapan kesetimbangan terbagi menjadi enam model yang tergolong mengalami miskonsepsi yaitu kekurangpahaman mengenai kesetimbangan heterogen, kesalahan penulisan persamaan Kp, pemahaman tentang nilai Kc bergantung pada pangkat dari koefisien reaksi pada kondisi reaksi yang sama, kesalahan menentukan satuan tetapan kesetimbangan, kesalahan menghitung Δn, dan tidak mengetahui koefisien reaksi zat yang tidak tertulis angka. Adapun model mental calon guru kimia pada konsep derajat disosiasi terbagi menjadi tiga yaitu model saintifik derajat disosiasi, model tanpa pengertian disosiasi, dan model kesalahan jumlah mol awal.
Kata kunci: model mental, calon guru kimia, tetapan kesetimbangan, derajat disosiasi
Abstract
This study was aimed at exploring the mental model of prospective chemistry teacher on the concepts of equilibrium constant and the degree of dissociation. This study used explorative qualitative research model. The research was conducted at the fifth semester students in the Chemistry Study Program at Riau University. The results show that the mental model of students as prospective chemistry teachers on the concept of the equilibrium constant is divided into six models that are classified as experiencing misconceptions: the lack of understanding about heterogeneous equilibrium, error writing in Kp equation, misunderstanding of the value of Kc depends on the rank of the reaction coefficient under the same reaction conditions, the error of determining the unit of equilibrium constant, the error of calculating Δn, and the lack of understanding regarding to the reaction coefficient of an unwritten number of substances. The mental model of prospective chemistry teachers on the concept of dissociation degree is divided into three: the scientific model of dissociation degree, the model without understanding dissociation, and the initial mole number error model.
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