Abstract
The concept of chemical bonds is one of the concepts that students are less familiar with, so there is a need for a diagnostic test to determine students' difficulty. This study aims to describe students' difficulties in understanding the concept of chemical bonds using two-tier multiple-choice which includes the following sub: (1) stable electron configuration, (2) valence electrons, (3) ionic bonds, (4) covalent bonds, and (5) metal bonds. The subjects of this study were students of class X MIA from SMA Negeri 1 Palangka Raya, SMA Negeri 3 Palangka Raya, and SMA Negeri 4 Palangka Raya with a total number of research subjects being 335 students. Students' difficulties in understanding the concept of chemical bonds were expressed using the Tes Kemampuan Ikatan Kimia (TKIK) form two-tier multiple choice of 15 questions and interviews to confirm the students' difficulty. The test results of TKIK showed a reliability of 0.68, an item discrimination power of 0.5, and an item difficulty level of 0.41. The results showed that the difficulty of the students in understanding the concept of chemical bonds with the percentage of the most difficult to easy difficulties was in order to determine the covalent bonds of 58.7%, determined the ionic bond at 55.4%, determined the metal bond at 54.3%, determined the stable electron configuration of 35.8%, and determine the valence electrons at 35.1%.
Highlights
Understanding the concept of chemical bonds using two-tier multiplechoice which includes the following sub: (1) stable electron configuration, (2) valence electrons, (3) ionic bonds, (4) covalent bonds, and (5) metal bonds
The results showed that the difficulty of the students in understanding the concept of chemical bonds with the percentage of the most difficult to easy difficulties was in order to determine the covalent bonds of 58.7%, determined the ionic bond at 55.4%, determined the metal bond at 54.3%, determined the stable electron configuration of 35.8%, and determine the valence electrons at 35.1%
Widiatmoko, A. & Shimizu, K., 2018, The Development of Two-Tier Multiple Choice Test to Assess Students’ Conceptual Understanding about Light and Optical Instruments, Jurnal Pendidikan IPA Indonesia, 7(4): 491-501
Summary
Alam (IPA) yang lebih memerlukan pemahaman konsep daripada hafalan. Hal tersebut dikarenakan kimia merupakan ilmu yang banyak memiliki konsep yang abstrak. Hasil pengamatan peneliti pada saat melakukan PPL II di SMA Negeri Palangka Raya diketahui bahwa dalam mempelajari materi ikatan kimia, kesulitan yang dialami oleh sebagian siswa adalah menentukan struktur Lewis, rumus kimia senyawa, dan jenis ikatan yang terjadi pada suatu senyawa. Salah satu cara untuk dapat mengetahui kesulitan siswa dalam memahami suatu konsep adalah menggunakan tes diagnostik yakni soal pilihan ganda dua tingkat (two-tier multiple choice). Instrumen two-tier multiple choice ini merupakan instrumen yang efektif untuk dapat mengidentifikasi tingkat pemahaman konsep dan telah digunakan oleh beberapa peneliti. Berdasarkan latar belakang masalah tersebut, maka pengembangan instrumen two-tier multiple choice perlu dilakukan untuk mengidentifikasi kesulitan yang dialami siswa dalam memahami konsep ikatan kimia. Penelitian ini berusaha mendeskripsikan kesulitan siswa kelas X MIA SMA di Kota Palangka Raya Tahun Ajaran 2018/2019 dalam memahami konsep ikatan kimia dengan menggunakan instrumen two-tier multiple choice. Tabel 1 (Sidauruk, 2005)
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