Conceptual understanding was one of cognitive aspect which ensure success rate of students. If conceptual understanding of students was good, students would been successful in following the course. The main goal of this study was to describe conceptual understanding of prospective student teacher after being taught using Problem based learning model. One shot case study design was chosen as research design. The research population for this study comprised all the second year students of chemistry education program which consisted of three classes. according to saturated sampling, all the members of population were selected as samples. they consisted of 71 students overall. Achievement Test was used to collect data. It was given to students to examine students' conceptual understanding. Data were then analyzed descriptively and quantitatively. The results from this study showed that students' conceptual understanding was in various rates. As many as 55 %, 15%, 3% and 27 % of students were classified as poor, fair, good, and very good respectively. AbstrakPemahaman konsep merupakan salah satu aspek kognitif yang menentukan tingkat keberhasilan peserta didik setelah melaksanakan proses pembelajaran. Jika pemahaman konsep yang dimiliki baik, maka peserta didik tersebut telah berhasil secara kognitif di dalam melewati proses pembelajaran. Tujuan pada penelitian ini adalah mendeskripsikan pemahaman konsep MAHASISWA setelah diajar menggunakan model problem based learning (PBL). Bentuk penelitian ini adalah pra-eksperimetal dengan rancangan the one-shot case study. Populasi pada penelitian ini adalah mahasiswa program studi Pendidikan Kimia universitas Tanjungpura semester II yang terdiri atas 3 kelas. Teknik pemilihan sampel dilakukan dengan cara sampling jenuh, dengan jumlah sampel sebanyak 71 mahasiswa. Teknik pengumpulan data yang digunakan untuk menelaah masalah tersebut dilakukan melalui pengukuran dengan instrumen tes hasil belajar digunakan untuk mengukur pemahaman konsep mahasiswa. Deskripsi pemahaman konsep calon guru kimia diketahui dengan analisis deskriptif kualitatif. Hasil penelitian diperoleh pemahaman konsep calon guru kimia setelah diajarkan menggunakan model PBL pada mata kuliah Manajemen Laboratorium diperoleh sebanyak 55% dengan kategori sangat kurang, 15% dengan kategori kurang, 3% dengan kategori baik, dan 27% dengan kategori sangat baik. Kata Kunci: Problem based learning; pemahaman konsepPermalink/DOI: http://dx.doi.org/10.15408/es.v10i2.7376

The integration between the three levels of chemical representations is needed by students to get a comprehensive understanding. Based on the preliminary study only 45.5% out of 120 year 2 and year 3 students of chemistry education who passed the final exam with satisfactory category. Thus, teaching resources that integrate the three levels of chemical representation are needed. The aim of this study is to develop and determine the level of validity of e-module utilizing multiple representations of molecular shapes based on VSEPR theory using augmented reality technology. This research employs research and development refers to the instructional design of the ADDIE model consist of 5 stages: Analyze, Design, Develop, Implementation and Evaluation. The products of this research are the e-module of molecular shapes based on VSEPR theory utilizing multiple representations and Augmented Reality Molecule Simulator (ARMOR) application. The resources presented 13 types of molecular shapes, molecules with lone pair and without lone pair of electrons around the central atom. The instrument used in this study is the validity questionnaire sheet. Data collected were then analyzed using the percentage criteria proposed by Akbar. The results of the experts’ validation indicated that the product is categorized as very valid with 94% of content validity, 93% of media validity, and 99% of language validity. Therefore, the ARMOR is suitable for use in teaching and learning process. Students show a positive response to the use of the application in helping them understand concepts, which are easy to use, has an attractive appearance, and fun.

Pengembangan LKPD ini dilatarbelakangi oleh kebutuhan pembelajaran untuk melatih kemampuan berpikir peserta didik dalam memecahkan masalah. Penelitian ini bertujuan untuk menentukan kelayakan Lembar Kerja Peserta Didik (LKPD) berbasis Problem Based Learning (PBL) pada materi koloid. Bentuk penelitian yang digunakan yaitu penelitian pengembangan (research and development/R&D), dengan menggunakan model pengembangan 4-D. Sampel penelitian ini adalah LKPD berbasis PBL. Teknik pengumpul data yang digunakan yaitu komunikasi tidak langsung dengan menggunakan alat berupa lembar penilaian kelayakan LKPD berbasis Problem Based Learning (PBL) yang dilihat dari aspek desain, bahasa, dan materi. Tenik analisis data dilakukan secara deskriptif kuantitatif. Hasil penilaian kelayakan LKPD menurut para ahli diolah dengan cara menghitung rata-rata presentase skor masing-masing aspek yang diinterpretasikan menurut kriteria yang dikemukakan oleh Riduwan. Skor yang diperoleh meliputi validasi ahli materi dengan skor 95 %,  validasi ahli bahasa dengan skor 88 %, validasi ahli desain dengan skor 100 %. LKPD  berbasis Problem Based Learning sangat layak untuk digunakan

The purpose of this study was to describe the role of 5e (engagement, exploration, explanation, elaboration, and evaluation) learning cycle model in improving student conceptual understanding. The form of this study was a pre-experimental design with a design which was one shoot case study. The population consisted of all second-semester students of chemistry education program who had been taking a basic chemistry course. According to the purposive sampling technique, the A2 class was then chosen as a sample. Achievement test was utilized to collect data. Data analysis was carried out by means of the quantitative-descriptive method. According to analysis, students gained 34 % and 66% improvements on fair and poor levels respectively.

This research is motivated by the large number of students who have difficulty working on material problems in the form of molecules. This study aims to determine the problem solving skills of class X IPA MAS Al-Mustaqim students in solving material problems in the form of molecules. The research method used is descriptive with case studies. The sample of the research was 16 students of class X IPA Mas Al-Mustaqim. Problem solving ability is measured using a written test in the form of an essay. The results of the study concluded that the ability to understand problems in the molecular shape material was high, the ability to prepare students' completion plans was high, and the ability to carry out completion plans was low.