MODEL MENTAL SISWA PADA SUBPOKOK BAHASAN PERUBAHAN MATERI

AbstrakPenelitian ini bertujuan mendeskripsikan dan menjelaskan profil model mental siswa serta mengidentifikasi faktor-faktor penyebab terbentuknya model mental alternatif siswa pada subpokok bahasan perubahan materi di SMP Negeri 2 Singaraja. Penelitian ini menggunakan pendekatan mix methods jenis sekuensial. Pengumpulan data dilakukan dengan observasi, pemberian tes diagnostik dua tingkat (two-tier), dan wawancara. Hasil penelitian menunjukkan profil model mental siswa kelas VII pada subpokok bahasan perubahan materi 5,30% tergolong model mental ilmiah, serta 92,38% mengalami model mental alternatif, yang meliputi 69,81% memiliki model mental benar sebagian dan 22,57% memiliki model mental miskonsepsi khusus. Sedangkan sisanya, sebanyak 2,32% tidak memberikan tanggapan. Faktor penyebab terbentuknya model mental alternatif pada pikiran siswa, meliputi minat dan motivasi belajar siswa rendah, pemaknaan konsep-konsep perubahan materi rendah, pemahaman konsep pendukung terkait perubahan materi rendah, pemahaman terhadap ketiga level kimia (level makroskopis, level submikroskopis, dan level simbolik) beserta interkoneksinya rendah, buku teks (paket) yang digunakan kurang lengkap, dan strategi mengajar yang diterapkan oleh guru tidak tepat.Kata-kata kunci: perubahan materi, model mental, model mental alternatif.AbstractThis research was aimed to describe and explain the profile of mental model students and identify the factors that cause the formation of an alternative mental model students on the subject of material changes at SMP Negeri 2 Singaraja. This research is a mix methods approach, type sequential. Data collection was carried out by observation, giving two-tier diagnostic tests, and interviews. The results showed the profile of mental class VII grade students on the  subject of  material change 5.30% classified as a scientific mental model, and 92.38% experienced an alternative mental model, which included 69.81% having a partially correct mental model and 22.57% having special mental misconception models. While the rest, as much as 2.32% did not give a response. Factors that cause the formation of alternative mental models on students minds, including low interest and student learning motivation, meaning concepts of low material change, understanding of supporting concepts related to low material changes, understanding of all three chemical levels (macroscopic level, submicroscopic level, and symbolic level) along with the low interconnection, the textbook (package) used is incomplete, and the teaching strategy applied by the teacher is not appropriate.Keywords: change materials, mental model, alternative mental model