The aim of this study was to determine the effect of the implementation of e-learning to the students' independence and interests in Science insight and Study Course. The used method was experimental posttest only control group design by questionnaire sheets. The subjects were Chemistry Education students year 2015. The results of the hypothesis-test showed that there are no significant differences of independence and interest in both of groups. However, the results of descriptive data analysis showed that the average students' independence and interest in the experimental was higher than the control group. The experimental group mean of 3.67 (good), while the control group average of 3.48 which are at the same category. Average students' interest in the experimental group of 4.21 (very good), while the average in the control group at 4.08 (good). In addition, based on the questionnaire of students' responses toward e-learning obtained mean of 4.51 (very good).

This quasi-experimental study used a pre-/posttest design to investigate student’s scientific habits of mind (SHOM) and chemical literacy. There were 32 students of the 11th grade selected for the experimental and control class. They were taken by random sampling. The experimental class applied inquiry learning via Predict-Observe-Explain-Extend (POEEd) using the socio-scientific issue (SSI) context, while the control class used a scientific approach that addressed the Indonesian national curriculum. The Acid-Base Chemical Literacy Test (A-BCLT) consisted of 19 items that used four contexts. Argumentative question added on each context. The other instrument was the SHOM scale in the SSI context. The scale consisted of 20 items in seven factors of SHOM. A group of experts looked at both instruments to ensure content validity. Then, the empirical test showed that both instruments have good reliability. MANOVA as the inferential statistic technique was used to analyze the differences among the group. The results showed that there was a significant difference in SHOM and students’ chemical literacy simultaneously. However, there was only a significant difference in students’ chemical literacy on separate analyses. Students have a better scientific argument in the case of acid rain as SSI, but it was less good for consumption of ulcer medicine for fasting people. Meanwhile, for SHOM, students have better thinking in open-mindedness and objectivity factors but less on curiosity. Some of the interesting findings and their implications are discussed in this study. The integration of SSI in chemistry learning is important. It is meaningful in promoting students’ thinking skills to become responsible citizens in the future.

This research aims to investigate the quality of final examination test items given to the Computer and Networking Engineering students. The test items were developed by four chemistry teachers in the state vocational school (SVS) and private vocational school (PVS) in Bantul regency respectively. This research discusses on the quality of the test conducted and overall items developed by the chemistry teachers for both of SVS and PVS. The quality of the test items is measured by using four variables which are (1) material, construction, and language aspects, (2) cognitive level comparison, (3) the suitability of the materials tested to the materials covered in 2013 Curriculum, and (4) the suitability of the number of the test items given to the materials covered and time allocated. Ex-post facto research design was administered for this research. The sample of the research was taken from the final examination test items for the 10th grade vocational school students of the Computer and Networking Engineering in Bantul regency for 2017/2018 academic year. The schools that involved in this research were represented by four schools for each of the SVS and PVS. The quality of the final examination test items was measured by using the instrument that was validated by three lecturers who are specialized in chemistry education. Each variable was analyzed descriptively using performance average. For variable 1, it was found that the quality of material, construction, and language of the final examination test items for both schools’ categories were very good. For variable 2, the quality of cognitive level of the final examination test items by SVS was very poor but poor for the PVS. However, it was a reversal for variable 3, when the PVS was very good prevailed by the mean percentage of the suitability of the materials tested to the materials covered in 2013 Curriculum compared to the SVS which was only in good category. For variable 4, the suitability of the number of test items given to the materials covered and time allocated, the mean percentage in SVS was very poor but poor for PVS. In conclusion, the overall of the quality test items developed by both the SVS and PVS chemistry teachers, was in good category for variables 1 and 3, and poor for variables 2 and 4. To conclude, this research able to observe that vocational school chemistry teachers for both SVS and PVS are able to construct good quality and appropriate test items.

This study aimed to explore chemical content in socio-scientific issues (SSIs) of biofuels as a context in chemistry learning. Based on the purpose, an exploratory research design was used in this study. The selection of issues based on five criteria that include (1) authenticity, (2) relevance, (3) results that have not been determined by social consensus, (4) topics that allow open discussion, and (5) issues related to the chemistry concept. In this qualitative method, content analysis data with the coding technique was done to classify themes in chemical content related to biofuels as social-scientific issues. This research showed that energy sources from biofuels become as examples of potential socio-scientific issues in chemistry learning. This issue is addressed by the nine chemical concepts contained in the senior high school curriculum. Finally, for the future, as a context, this potential issue can be used as a driving factor in chemistry learning with the socio-scientific issues approach.

The study purpose to analysis the students’ chemical literacy level of electrochemistry topic. Descriptive study with a quantitive approach was done. There were 148 twelfth-grade students as samples that came from two senior high schools in Yogyakarta, Indonesia. The Electrochemistry Chemical Literacy Test (ECLT) was used to gain the data. The ECLT had fifteenth open-ended questions that covers four concepts, i.e. redox reaction, voltaic cell, electrolysis, and corrosion. To ensure the content validity of ECLT, a group of experts have looked at and give some suggestions. The students’ responses toward ECLT was examined quantitatively and categorized into five levels: illiterate, nominal, conceptual, functional, and multidimensional ones. The results shown that the mostly students achieved at nominal and conceptual level, also illiterate in almost similar percentages. The lowest achievements were for functional and multidimensional level. In the view of concepts, corrosion gained best result, meanwhile electrolysis have lowest result. These suggest that the chemistry teachers should facilitate an appropriate and conducive learning environment for students’ learning. It is useful for enhancing the chemical literacy level, especially by conduct context-based chemistry learning.

This study aimed to comprehend the quality of critical thinking questions and measure the critical thinking ability in the daily life acid-base topic of 2nd -students from six public high schools, six private high schools, and combination of them in Yogyakarta at the 2018/2019 academic year based on the answer patterns of students to the developed critical thinking questions. The method was an ex-post facto research designed with a one-sample design. The level of critical thinking ability was measured by 15 critical thinking question outlined from the seven critical thinking criteria referred to established commercial critical thinking test. The questions were theoretically validated by three reviewers (content, evaluation, and chemistry education experts). The results showed that the quality of critical thinking questions were excellent. The level of critical thinking skills in daily life acid-base topic of 2nd-grade Yogyakarta’s senior high schools at the academic year 2018/2019 of six public high schools, six private high schools, and combination both of them was 40.2% (moderate), 34.8% (deficient), 37.5% (deficient), respectively.

Sesuai dengan Peraturan Menteri Kesehatan RI No. 492/Menkes/Per/IV/2010 tentang Persyaratan Kualitas Air Minum, kesadahan dalam air layak minum tidak dapat lebih dari nilai baku mutu sebesar 500 mg/l. Tingginya kadar kapur didaerah Wonogiri yang dapat menyebabkan terganggunya kesehatan menimbulkan kesadaran masyarakat untuk mengolah air minum. Oleh karenanya dilakukan program pengabdian kepada masyarakat (PPM) di daerah kelurahan Giritontro, Kabupaten Wonogiri yang bertujuan mengangani masalah kesadahan (kadar kapur) dalam air minum dengan menggunakan Biosand Filter. Pada PPM ini, diperoleh hasil bahwa teknologi Biosand Filter dapat mengurangi tingkat kesadahan hingga 78%.

Beberapa daerah di Wonogiri memiliki tanah yang mengandung kapur, sementara itu sebagian masyarakat mengonsumsi air yang berasal dari dalam tanah. Pada kegiatan pengabdian kepada masyarakat tahun 2016 ditemukan permasalahan dalam masyarakat di kelurahan Wonogiri yaitu sulitnya mendeteksi adanya kapur dalam air yang mereka konsumsi. Sebagai akibatnya banyak masyarakat yang menderita penyakit dalam yang diakibatkan pengendapan kapur di dalam tubuh mereka seperti penyakit ginjal. Oleh karenanya, tim PPM Fakultas MIPA Universitas Negeri Yogyakarta membangun sistem pendeteksi adanya kapur dalam cairan berbasis Light Emitting Diode (LED) dan Light Dependent Resistor (LDR). LED digunakan untuk menyinari cairan dengan kadar kapur yang berbeda-beda, kemudian LDR akan mendeteksi cahaya LED yang melewati cairan tersebut. Besar kecilnya nilai luaran LDR akan bergantung kadar kapur dalam cairan. Masyarakat sangat antusias dan mulai menggunakan alat ini untuk mendeteksi adanya kapur di air yang mereka konsumsi. Kata kunci: Kesadahan, LDR, LED Workshop On Detector of Water Hardness Based On Light Dependet Resistor In Giritontro Village, Giritontro District, Wonogiri RegencyAbstract           Some areas in Wonogiri contain hardness in its soil, while some people consume water that come from the soil. In community service activity in 2016, we found problems in the community in Giritontro, Wonogiri that is the difficulties to detect the hardness in the water that people consume. As a result, many people who suffer from internal diseases caused by the deposition of lime in their bodies such as kidney disease. Therefore, the PPM team of the Faculty of Mathematics and Natural Sciences of Yogyakarta State University built a hardness detection system in liquid based Light Emitting Diode (LED) and Light Dependent Resistor (LDR). LEDs are used to irradiate fluids with different lime levels, then LDR will detect the LED light passing through the liquid. The size of the LDR output value will depend on the lime content in the liquid. People are very enthusiastic and start using this tool to detect the presence of limestone in the water they consume. Keywords: Hardness, LDR, LED