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All Journal JURNAL PROFESI KEGURUAN Jurnal Akademika Kimia
Solfarina, Solfarina
Universitas Tadulako
Chemistry Education

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Pengaruh Waktu Perebusan Biji Nangka (Artocapus heterophyllus Lamk) Terhadap Kadar Karbohidrat, Protein, Dan Lemak Yulianti, Selvi; Ratman, Ratman; Solfarina, Solfarina
Jurnal Akademika Kimia Vol 4, No 4 (2015)
Publisher : Universitas Tadulako

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Abstract

Jackfruit seeds are part of the jackfruit which were not used optimally. The seeds can be eat directly after boiling and can also be changed as flour because it contains carbohydrates, proteins, and fats. This study was conducted to test the levels of carbohydrates, proteins, and fats of jackfruit seeds after boiled at different times, which were 15 minutes, 30 minutes, and 45 minutes. Carbohydrates, proteins, and fats were determined successively using the phenol sulfuric acid, the kjeldahl and the soxhlet extraction methods. Levels of carbohydrates at various boiling times of 15 minutes, 30 minutes, and 45 minutes were 49.06%, 43.68%, dan 42.75%. Levels of proteins were 3.928%, 3.84%, and 3.57%, while levels of fats were 5.40%, 0.95%, and 0.40%. The results showed that the longer the boiling time affected to declining levels of carbohydrates, proteins, and fats.
Pembuatan Bioetanol Dari Biji Durian (Durio zibethinus) Jayanti, Titi; Solfarina, Solfarina
Jurnal Akademika Kimia Vol 4, No 3 (2015)
Publisher : Universitas Tadulako

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Abstract

Durian (durio zibethinus) is a tropical plant which is included in the family Malvaceae. The durian flesh is consumed and the durian seed are waste. The purpose of this study was to process durian seeds as raw material for bioethanol production and to determine the levels of ethanol produced from the durian seeds. Fermentation process in this study was conducted using yeast saccharomyces cerevisiae, NPK and urea fertilizers as the starters. After the starters were incubated for two days, then added to the samples and fermented for 5, 8, 11 and 14 days and then distilled. After distilled, the measured ethanol yield, the reaction, with sodium, water dissolued, gravity, and ethanol pH produced. The results showed that fermentation for 5 days derived ethanol content of l5.15%, density 1.08 g/mL, and the pH 3.35. Fermentation for 8 days derived ethanol content of 4.67%, density 0.98 g/mL, and the pH 3.11. Fermentation for 11 days obtained ethanol content of 5.48%, density 0.99 g/mL, and the pH 3.45. Fermentation for 14 days obtained ethanol content of 2.30%, density 1.00 g/mL, and the pH 3.40. This study concluded that durian seeds can be processed into raw material for producing ethanol by fermentation.fermentationfor 5 days was good compared to the 8, 11 and 14 days with ethanol content of 15.15%.
Pengaruh Penerapan Model Pembelajaran Kooperatif Tipe Two Stay Two Stray Pada Pokok Bahasan Sistem Periodik Unsur Terhadap Hasil Belajar Siswa Kelas X SMA Negeri 1 Dampelas Rahmi, Sitti; Said, Irwan; Solfarina, Solfarina
Jurnal Akademika Kimia Vol 3, No 1 (2014)
Publisher : Universitas Tadulako

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Abstract

Learning on teacher centered learning chemistry, causing the interest and creativity of the students do not develop. This condition contributes to the low of students learning outcomes. Students learning outcomes will be better is students experience for themselves what really happened. Therefore we need a method of teaching which is one oriented to students. This study uses a model of cooperative learning TSTS which is one method of teaching. The purpose of this study is to determine the effect of the application of the cooperative learning model TSTS on the subject of the periodic table of the learning outcomes of students of class X SMA Negeri 1 Dampelas. The study population was all students in the class X SMA Negeri 1 Dampelas academic year 2012/2013 consisting of six classes. The study sample consisted of two classes, namely class XA 32 students as the experimental class and the class XF 32 students as the class control are determined by purposive sampling. Results of analysis of data obtained for the mean score on the experiment class X1 = 76.50 with a standard deviation = 12.18 and the control class X2 = 57.81 with a standard deviation = 16.26. Based on the hypothesis testing results obtained tcounting = 5.21 and ttable = 2.00 at α = 0.05. In this case H1 is accepted and Ho is rejected, because tcounting is in the rejection of Ho. It can be concluded that the application of cooperative learning model TSTS on the subject of periodic system of elements had a positive effect on learning outcomes of students of class X SMA Negeri 1 Dampelas.
Penerapan Model Pembelajaran Kooperatif Tipe Two Stay Two Stray (TSTS) Pada Pokok Bahasan Ikatan Kimia Di Kelas X SMA Negeri 1 Sausu Dewijayanti, Putu W.; Walanda, Daud K.; Solfarina, Solfarina
Jurnal Akademika Kimia Vol 3, No 1 (2014)
Publisher : Universitas Tadulako

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Abstract

Generally in the learning process students tend to be passive in finding out the concept. Students just rewrite the existing conceptss, so that their learning outcomes are less. To obtainthe improvement of students’ learning outcome it required a learning model, one of them is cooperative learning model TSTS. This study aims to apply student-centered in the learning process of SMA Negeri 1 Sausu, and to investigate the students’ learning outcomes with the application of the learning model TSTS type and the conventional on chemistry subject at the tenth grade students of SMA Negeri 1 Sausu. This research is experimental research with quasi experiment design. The population is the whole tenth grade students numbered 124 studends with the sample taken purposively where class B as for the control class numbered 31 students and class D as for the experimental class numbered 31 students. The results of the data analysis obtained the average score of the experimental class is 7.04 with deviation standard is 2.85 and control class is 5.43 with deviation standard is 3.11. from the results of testing hypothesis obtained tcounted = 2.26 and ttable = 2.00 at α = 0.05, so that H1 is accepted and H0 is rejected. These data showed that students’ learning outcomes with the implementation of cooperative learning model TSTS were higher than conventional learning model on the subject of chemistry at the tenth grade students of SMA Negeri 1 Sausu.
Mind Mapping Dalam Pembelajaran Struktur Atom Pada Siswa Kelas X SMA Negeri 1 Palu Muhamad, Sirhan; Solfarina, Solfarina; Ratman, Ratman
Jurnal Akademika Kimia Vol 4, No 3 (2015)
Publisher : Universitas Tadulako

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Abstract

Teaching and learning is a process involving interaction with active communication between students and teacher in educational activities. Therefore we need a method of learning that is focused to the students. That is why required a learning model that empowers students to be more actively involved in the learning process at schoolis mind mapping. The aim of this study is to describe and determine the differences in use mind mapping in class X SMA Negeri 1 Palu on the subject of atomic structure. The population in this research was class X (n =408 student) academic year 2013/2014. The sample of this research was class X 3 (using mind mapping method) while class X 5 as the control class (using concept maps), both of class have 34 students. Data collected was conducted by instruments, namely test results of studying chemistry at the atomic structure which has been validated before. The examination of data was conducted by using statistical analysis two tailed t-test with the prerequisite tests (normality and homogeneity test). The average score in the experimental class is 77.15 while the average score in control class is 68.44. Based on statistical hypothesis testing to two tailed t-test obtain tcalculation = 10.89 > ttable = 2.00 at α = 0.05 with criteria if Ho is accepted tcalculationttable(1–α), (n1 + n2). As result, H0 is not accepted due to tcalculation was in the rejection area of Ho. This indicates that there are differences in student learning outcomes through the application between the mind mapping and the concept maps methods in class X SMA Negeri 1 Palu.
Pengaruh Mind Mapping Melalui Brain Based Learning Terhadap Hasil Belajar Siswa Pada Materi Ikatan Kimia Di Kelas X MIA SMA Negeri 1 Marawola Purnama, Ririn; Ratman, Ratman; Solfarina, Solfarina
Jurnal Akademika Kimia Vol 4, No 3 (2015)
Publisher : Universitas Tadulako

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Abstract

A research about the influence of mind mapping through brain-based learning in chemical bonding subject on students learning outcomes in class X MIA SMA Negeri 1 Marawola has done. The problem in this research whether there was an influence of mind mapping through brain-based learning to the learning outcomes of students in chemical bonding subject in class X MIA SMA Negeri 1 Marawola. The aim of this study is to determine the influence of mind mapping through brain-based learning in chemical bonding subjecton student learning outcomesin class X MIA SMA Negeri 1 Marawola. This study is a quasi-experiment with purposive sampling. The sample of research consists of two classes, MIA 1, consist of 26 students as a experiment class taught with brain-based learning using mind mapping method and class X MIA 3, consist of 26 students as a control class taugth with brain-based learning using the scientific method. Research results obtained value of x, in the experimental class = 79.30 with a standard deviation = 13.80 and in the control class = 74.30, with a standard deviation = 11.80. From these results, a testing for normality class was done, in the experimental class χ2 value= 4.71 and in the control class χ2 value= 1.85 with the χ2 table = 7.81. The data is normally distributed it as can be seen that both in the experimental class and the controll class χ2 value is less than χ2 table, 4.712.02) in significance level χ = 0.05 and degrees of freedom dk = 50. It can be concluded that the mind mapping through brain-based learning in these experiment class on chemical bonding subject give a positive effect on student learning outcomes in comparison with the control class SMA Negeri 1 Marawola.
Application of PDEODE Learning Model to Increase Student's KPS in Buffer Solution Halimah, Mamah; Langitasari, Indah; Solfarina, Solfarina
Jurnal Profesi Keguruan Vol 5, No 1 (2019): Jurnal Profesi Keguruan
Publisher : LP3 Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7290/jpk.v5i1.17714

Abstract

Penelitian ini bertujuan untuk mengetahui peningkatan KPS siswa melalui penerapan model pembelajaran PDEODE. Desain penelitian ini adalah one group pretest-posttest dengan teknik pengambilan sampel purposive sampling. Intrumen pengukuran yang digunakan berupa tes pilihan ganda berjumlah 30 soal dan lembar observasi yang telah tervalidasi. Teknik analisis data yang digunakan adalah analisis deskriptif menggunakan N-Gain dan analisis statistik menggunakan uji t dependen. Berdasarkan hasil penelitian diketahui bahwa adanya peningkatan KPS siswa akibat penerapan model pembelajaran PDEODE. Peningkatan ini dibuktikan oleh hasil uji t yang memiliki nilai signifikansi sebesar 0,000. Nilai N-Gain yang diperoleh pada masing masing indikator yang diteliti adalah indikator menafsirkan (0,682), indikator mengelompokkan (0,338), indikator mengamati (0,569), meramalkan (0,456), mengajukan pertanyaan (0,506), merumuskan hipotesis (0,433), merancang percobaan (0,511), menggunakan alat/bahan (0,449), menerapkan konsep (0,458) dan berkomunikasi (0,529). Dapat dibuktikan bahwa KPS siswa meningkatThis study aims to determine the increasing of students' KPS through the application of the PDEODE learning model. The design of this study was one group pretest-posttest with purposive sampling technique. The measurement instruments that be used were multiple choice tests with a total of 30 questions and validated observation sheets. Data analysis techniques that used in the form of descriptive analysis using N-Gain and statistical analysis using the dependent t test. Based on the results of the research, it was found that there was a development in student KPSPSS due to the application of the PDEODE learning model. This development was proved by the results of the t test which has a significant value of 0,000. N-Gain values that obtained in each indicator that be observed were interpreting indicators (0.682), grouping indicators (0.338), observing indicators (0.569), predicting (0.456), asking questions (0.506), formulating hypotheses (0.433), designing experiments (0.511), using tools/materials (0.449), applying the concept (0.458) and communicating (0.529). It can be proven that student KPS is increasing
Pengaruh Siklus Belajar Hipotesis Deduktif pada Konsep Reaksi Redoks Terhadap Keterampilan Berpikir Kritis Haerunnissa, Nina; Solfarina, Solfarina; Langitasari, Indah
Jurnal Profesi Keguruan Vol 5, No 1 (2019): Jurnal Profesi Keguruan
Publisher : LP3 Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7290/jpk.v5i1.17783

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh siklus belajar hipotesis deduktif pada konsep redoks terhadap keterampilan berpikir kritis siswa. Metode penelitian yang digunakan adalah kuasi eksperimen dengan nonequivalent control group design. Sampel penelitian adalah siswa kelas X MIA yang terdiri atas kelas eksperimen dan kontrol yang diambil dengan teknik purposive sampling. Instrumen pengumpulan data yang digunakan adalah tes, sebanyak 13 soal uraian yang valid dan reliabel,dan lembar observasi. Data hasil penelitian dianalisis secara statistik dan deskriptif. Hasil penelitian menunjukkan perbedaan KBK siswa berdasarkan nilai N-Gain pada aspek memberikan penjelasan sederhana, membangun keterampilan dasar, menyimpulkan, dan memberikan penjelasan lebih lanjut pada kelas kontrol berturut-turut adalah 0,22; 0,25; 0,30; dan 0,27, sedangkan pada kelas eksperimen sebesar 0,40; 0,41; 0,45; dan 0,40. Nilai N-Gain tersebut menunjukkan tingkat KBK kelas eksperimen lebih tinggi dari kelas kontrol. Hal tersebut didukung oleh hasil uji hipotesis menggunakan Independent Sample T-Test yang menunjukkan bahwa terdapat perbedaan KBK antara kelas eksperimen dan kelas kontrol, sehingga dapat disimpulkan bahwa siklus belajar hipotesis deduktif berpengaruh lebih baik terhadap keterampilan berpikir kritis siswa dibanding pembelajaran demonstrasi.This research aim is to find out the effect of hipotetical deductive cycle learning on redox reaction concept to student critical thinking skills. Type of research is quasi experimental with nonequivalent control group design. Sample of research is students of science class X as experimental and control class taken by purposive sampling technique. Data collection methods used are  test with 13 description questions that has validity and reliability and observation with observation sheet. Data of research result were analyzed by statistic and descriptive. The result showed increasing of CTS based on N-Gain value in aspects simple explanation building basic skills, concluding, and giving further explanation in sequence is 0,22; 0,25; 0,30; and 0,27 at control class and 0,40; 0,41; 0,45; and 0,40 at experimental class. N-Gain value showed CTS level of experimental is higher than control class. Its supported by hipothesis test dengan independent sample t-test result that showed there are differences of CTS between experimental and control class so it can be concluded that hipotetical deductive cycle learning take positive effect to critical thinking skills outcomes of students.
Co-Authors Daud Karel Walanda Dewijayanti, Putu W. Haerunnissa, Nina Indah Langitasari, Indah Irwan Irwan Jayanti, Titi Mamah Halimah, Mamah Muhamad, Sirhan Purnama, Ririn Ratman Ratman sitti rahmi, sitti Yulianti, Selvi