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INDONESIA
Jurnal Akademika Kimia
Published by Universitas Tadulako
ISSN : 24775185     EISSN : 23026030     DOI : -
Core Subject : Science, Education,
Chemistry Education
Jurnal Akademika Kimia merupakan jurnal elektronik open access yang bertujuan untuk mempublikasi hasil-hasil penelitian terbaru dalam area pendidikan akademik khususnya pada bidang pendidikan kimia meliputi asesment pembelajaran, model pembelajaran dan pengembangan perangkat pembelajaran, serta kimia murni termasuk kimia organik, kimia anorganik, kimia analitik, kimia fisik, biokimia dan bidang kimia lainnya seperti kimia lingkungan.
Arjuna Subject : -
Articles 240 Documents
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Buah Mengkudu (Morinda citrifolia L.) Sebagai Pengadsorbi Minyak Jelantah Barau, Fitri; Nuryanti, Siti; Pursitasari, Indarini Dwi
Jurnal Akademika Kimia Vol 4, No 1 (2015)
Publisher : Universitas Tadulako

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Abstract

The used and storage of cooking oil that has not been done properly can lead to exessive water content in the oil. Thus, this can degrade the quality of the oil and fried foods, and turn to interfere health. The aim of this study was to determine teh quality of used cooking oil after adsorbed by mengkudu or noni (morinda citrifolia L.) powder. The quality of the oil was determined based on the free fatty acids content, peroxide numbers, moisture and dirt content before and after adsorbased by using the titration method in determining the FFA content and peroxide number, while the water content and impurities levels were determined by using a closed oven method. The quality standard of good oil is based on the Indonesian National Standard (SNI), i.e. the maximum free fatty acid content of 0.3%, the maximum peroxide numbers of 2 meq.O2/kg, the maximum water contens of 0.3%, and the impurities level of 1.0%. The result indicated that the quality of used cooking oil before adsorption was not in accordance with the quality standards of oil. The quality of oil improved after adsorption with 5 grams, 10 grams and 15 grams of noni powder of 100 ml waste cooking oil, and the best absorbent numbers, moisture content, and dirt with 15 grams were 0.2%, 2 meq.O2/kg, 0.09%. This is showed that the quality of the used cooking oil to be better after the addition of noni powder served as an adsorbent.
PEMBUATAN ETANOL DARI BUAH SALAK (Salacca Zalacca) YANG TIDAK LAYAK KONSUMSI Yasin, Lukman; Jura, Minarni Rama; Supriadi, Supriadi
Jurnal Akademika Kimia Vol 2, No 1 (2013)
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Abstract

Salak is a inclusive of into erudite tribe Moraceae name is a salacca zalacca in English named is a snake fruit and one of fruit type which is at most planted in the tropics. One of potency from of salak which improper consume that is exploited permanent upon which making ethanol, where glucose can be exploited as ethanol, because in it contain elements of carbon,hydrogen and oxygen. which is do not consume that is damage storey level 90. The purpose of this research is to cultivate salak which improper consume as raw material for making etanol by fermentation process and to determine the level of ethanol produced from salak which improper consume. In this research yeast fermentation is used with tape, NPK fertilizer and urea fertilizer. Starter used by 20 mL each of three erlenmeyer. The starter and then fermented for 5, 8, 11 and 14 days ago on distillation. After the distillation was measured levels of ethanol, the reaction with Na metal, solubility in water, density measuremen and measure pH ethanol. Then the analysis show a 5 day fermentation obtained 13.8%, ethanol content weight of 0.991 g/mL and pH 5.02. Fermentation for 8 days derived ethanol content of 10.79%, density 0.989 g/mL and pH 4.21. Fermentation for 11 days gained ethanol content 6%, weight of 0.982 g/mL and pH 3.04. And fermentation obtained 2.20%, density 1.002 g/ml and pH 2.25.
Pengaruh Lama Waktu Fermentasi Terhadap Kadar Bioetanol dari Pati Ubi Jalar Kuning (Ipomea batata L) Moede, Fika Herlina; Gonggo, Siang Tandi; Ratman, Ratman
Jurnal Akademika Kimia Vol 6, No 2 (2017)
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Abstract

The sweet potato is yellow is one that the carbohydrate that is high, so it can be used as one of the alternative raw materials for bioethanol. This study aims to determine the levels of ethanol sweet potato is yellow through fermentation with the use of yeast bread with a variety of time 3, 4, 5, 6, dan 7 days at room temperature. The results of the research showed glucose levels derived from the process of hydrolysis using acid HCl 21% were of 4.54% with high levels ethanol that optimum obtained through fermentation use of yeast Saccharomyces cerevisiae of 9.70% over fermentation 5 days.
Pengaruh Aktivasi Kimia Arang Tanaman Eceng Gondok (eichhornia crassipes) Terhadap Adsorpsi Logam Timbal (Pb) Sangkota, Vivi Dia A.; Supriadi, Supriadi; Said, Irwan
Jurnal Akademika Kimia Vol 6, No 1 (2017)
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Abstract

This study aimed to determine the optimum pH and the optimum weight of charcoal and activated charcoal from water hyacinth in adsorbing the lead (Pb) metals. Determination of adsorbed metal content in the charcoal and the activated charcoal was measured using a spectrophotometer spectrodirect. Activated water hyacinth charcoal was prepared by carbonization in a furnace at a temperature of 300 oC in low oxygen levels. Then the carbon was activated by adding ZnCl2 10%, soaked for 24 hours, filtered and placed in the oven at a temperature of 105 0C for 1 hour. The optimum pH was determined by mixing Pb2+ with water hyacinth (eichhornia crassipes) charcoal at various pH of 3-8. The results indicated the optimum pH of charcoal and activated charcoal to adsorb metals was 5 with the percentages of lead absorbed were 90.34% and 98.67%, respectively, while the weight of charcoal varied by 25, 50, 75, 100 and 125 mg, the optimum weight of activated charcoal was 100 mg with lead absorbed by 98.44%. The results showed that the water hyacinth charcoal and activated charcoal performed excellent ability to adsorb lead metal.
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)
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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.
PENINGKATAN HASIL BELAJAR KIMIA MENGGUNAKAN MULTIMEDIA PADA MATERI IKATAN KIMIA KELAS X SMK NEGERI PARIGI SELATAN Jumadil, Jumadil; Gonggo, Siang Tandi; Rahmawati, Sitti
Jurnal Akademika Kimia Vol 2, No 1 (2013)
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Abstract

This study aims to determine whether to use the multimedia macromedia flash points can increase the activity and learning achievement of students in the chemical bond subject at class X SMK South Parigi. The sample is a class X SMK south Parigi is 46 students. This research is the Classroom Action Research (PTK) type which was implemented in three cycles, where each cycle consists of four stages, namely: planning, implementation, observation, reflection. Data obtained from each cycle were analyzed to determine the corrective action in the next cycle. Data collection is carried out through a test which consists of post tests at each end of the learning cycle 1, 2, 3 and also interviews for the entire series of events during the activity, as well as the observation sheet activities of teachers and students of each meeting. The collected data were statistically analyzed using the average of the class, classical absorption, and the thoroughness of learning. On the cycle I the average value of 6.87, the absorption of classical learning 68.81% and 68.42% completeness, in the second cycle the average value was 7.73, 77.32 and 88.37% and classical absorption the completeness study on a third cycle of the average value was 8.23, the absorption of classical learning 82.33% and 93.33% completeness. While on the student activity, the cycle I get an average score of 27 which is an increase in the second cycle to 36 and 40 in cycle III with both criteria. Therefore, the use of power point and multimedia macromedia flash in learning can improve student learning activities and results.
Pengaruh Pemberian Ekstrak Buah Kelor (Moringa oleifera) Terhadap Penurunan Kadar Kolestrol Pada Darah Hewan Mencit (Mus musculus) Zulviana, Eva; Rahman, Nurdin; Supriadi, Supriadi
Jurnal Akademika Kimia Vol 6, No 1 (2017)
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Abstract

This study aimed to identify bioactive compounds of moringa (moringa oleifera) extracts and determine the effective concentration on lowering blood cholesterol levels of mice. The animals used were 15 male mice induced by propylthiouracil and fat food diet. The mice were divided randomly into 5 groups with different treatment groups. The first, the second, and the third treatments were given moringa extracts each with a concentration of 10, 20% and 40%. The fourth treatment group was given food fat diet and propiltiorasil as a positive control, and the fifth treatment was given standard food and distilled water as a negative control. Data were analyzed using a statistical analysis of variance (ANOVA) test followed by Duncan test. The results showed that moringa fruit extract contains alkaloids, saponins, flavonoids, and tannins. Moringa fruit extract can lower blood cholesterol levels of mice with the most effective concentration of 10%.
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)
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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.
PERBANDINGAN PENERAPAN MODEL PEMBELAJARAN KOOPERATIF TIPE STAD (STUDENT TEAMS ACHIEVEMENT DEVISIONS) DENGAN PEMBELAJARAN KONVENSIONAL PADA MATERI TERMOKIMIA KELAS XI SMA NEGERI 7 PALU Rusli, Riana A.; Sabang, Sri Mulyani; Tangkas, I Made
Jurnal Akademika Kimia Vol 2, No 2 (2013)
Publisher : Universitas Tadulako

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Abstract

The aims of this research is to increase result of learning student at items of thermochemistry of class XI SMA Negeri 7 Palu. One of effort used to increase result of learning the by applying model the study of co-operative of type STAD (Student Teams Achievement Devision). As for which this research background because items termokimia represent the items assumed difficult by this items and student also of vital importance comprehended by student of class XI. So that is not assumed difficult, draging on and is easy to comprehended by student hence teacher have to give a pleasant study model with the model of study of co-operative of type STAD (Student Teams Achievement Devision). this Research Population is all student of class of XI IPA SMA Negeri 7 Palu of school year 2012/2013 consisted of by 3 class and sampel used consisted of by two class that is XI IPA1 as much 37 people as class of experiment and class of XI IPA2 as much 37 people as control class determined by purposive sampling. Data collecting done to use the instrument tes in the form of tes result of learning is tested by the student chemistry of validity, reliabilitas, mount the difficulty and energy of the difference. Data examination result of research use the statistical analysis test the t one party (right) with the prerequisite test, test the normalitas, and homogeneity. At this research obtained by a mean score result of learning student by using model of study of co-operative of type STAD is 13.20 while mean score result of learning student following conventiona l study 8.93. Pursuant to hypothesis examination statistically test the t one party (right) obtained by value t calc > t table that is 6.88 > 1.67 with the belief level = 0.05 and dk = 72. The result refer that result learn the student chemistry use the model of study of compared to by better type STAD co-operative result learn the student by using conventional study model.
Back Matter JAK Vol 6 No 2 2017 Walanda, Daud K.
Jurnal Akademika Kimia Vol 6, No 2 (2017)
Publisher : Universitas Tadulako

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Abstract

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