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All Journal Jurnal Kreatif Tadulako Online BUNGAMPUTI Jurnal Akademika Kimia SCAFFOLDING: Jurnal Pendidikan Islam dan Multikulturalisme Jurnal Ilmiah Kanderang Tingang Journal of Educational Chemistry (JEC) Jurnal Riset Pendidikan MIPA Journal of Disruptive Learning Innovation (JODLI) Journal International Journal of Teaching and Learning (INJOTEL) Jurnal Akademika Kimia
Ratman Ratman
Tadulako University
Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Mathematics Other

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PENERAPAN MODEL PEMBELAJARAN KOOPERATIF TIPE TWO STAY TWO STRAY TERHADAP HASIL BELAJAR KIMIA SISWA KELAS XI IPA 2 PADA POKOK BAHASAN LAJU REAKSI DI SMA NEGERI 1 KASIMBAR Masrah, Masrah; Ratman, Ratman
Jurnal Akademika Kimia Vol 2, No 1 (2013)
Publisher : Universitas Tadulako

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Abstract

This sudy presents the research of classroom action (PTK) executed in two cycle, in which every cycle cover the planning, execution, observation and reflection. This research aims to increase chemistry result study for student of XI IPA2 class on senior high school 1 of Kasimbar in rate reaction material through application of cooperative learning two stay two stray model. Research subject was XI IPA2 class on senior high school 1 of Kasimbar amount to 35 students. Data type was collected data qualitatively in the form of result of observation of student activity and learn at the time of process learn take place, and quantitative data in the form of result learn the student of final tes evaluation of action. Result of cycle I obtained by activity of student and teacher be at the good criterion, percentage of absorpsion classical 62.0% and complete learn the classical 65.7%. The second cycle experience of the improvement, that is activity of student and teacher be at the criterion very good, percentage of absorpsion classical 76.8% and complete learn the classical 88.5%. Results indicated that the application cooperative learning model two stay two stray can improved chemistry result study for student of xi IPA2 class in reaction rate material on senior high school 1 of Kasimbar.
Pengaruh Waktu Fermentasi Terhadap Kadar Bioetanol Dari Kulit Jagung Manis (Zea mays saccharata) Agustina M., Renni; Ratman, Ratman; Said, Irwan
Jurnal Akademika Kimia Vol 5, No 4 (2016)
Publisher : Universitas Tadulako

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Abstract

This study aimed to determine the effect of fermentation time on the level of bioethanol from sweet corn bark. Sweet corn bark is one of the agricultural wastes containing cellulose which can be converted to bioethanol through several stapes. The steps were sample preparation, delignification, hydrolysis, and fermentation. This study applied fermentation process on the sweet corn bark using yeast bread (saccharomyces cereviseae) with time variations i.e 2-8 days.The products of fermented ethanol increasedand reached the optimum at 6 days fermentation with the bioethanol level of 4.50,then decrease the ethanol content at day 7 and 8.
Analisis Senyawa Metabolit Primer Pada Jamur Merang (Volvariela volvaceae) Di Daerah Perkebunan Kelapa Sawit Lalundu Wahidah, Nur; Ratman, Ratman; Ningsih, Purnama
Jurnal Akademika Kimia Vol 6, No 1 (2017)
Publisher : Universitas Tadulako

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Abstract

Lalundu region is located in Central Sulawesi where we can find many mushrooms (volvariela volvaceae). The aim of this study is to determine the levels of primary metabolites of mushroom at the regional oil palm plantations Lalundu. The analysis of carbohydrates level was using a UV-vis Spectrophotometer, for protein using a Spectro Direct while for fat by soxhlet. Based on the results of the analysis, the levels of carbohydrates obtained was 7.35% in 1 gram mushroom. The protein content obtained was 1,67% while the fat content results were 2.53%. These indicate that the primary metabolite levels in mushroom at Lalundu region are very high compared to literature.
Identifikasi Zat Warna Rhodamin B Pada Lipstik Yang Beredar Di Pasar Kota Palu Purniati, Ni Ketut; Ratman, Ratman; Jura, Minarni Rama
Jurnal Akademika Kimia Vol 4, No 3 (2015)
Publisher : Universitas Tadulako

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Abstract

Rhodamine B is a synthetic dye used for colouring of paper, textiles and inks. Rhodamine B is able to cause an irritation of the respiratory tract, liver damage and as a carcinogenic substance. The use of dyes aims to obtain more attractive colour. This study aims to identify the rhodamine B on lipsticks in the market in Palu City. The dye was determined using thin layer chromatography (TLC) through qualitative and quantitative tests. The results showed that all lipstick samples were negative containing rhodamine B. Based on qualitative test by TLC did not found similar Rf 0.72 cm confirming the reference solution for rhodamine B, where the value of Rf on consecutive samples were 1A code samples obtained value Rf = 0.58 cm, the sample code 2A obtained value Rf = 0.46 cm, the sample code 3A Rf value = 0.68 cm, the sample code 4A obtained Rf = 0.65 cm, code samples obtained 1B Rf = 0.49 cm, and the sample code 2B obtained value Rf = 0.50 cm. Based on this study it can be concluded that all 6 lipstick samples tested did not contain rhodamine B.
Indikator Asam-Basa dari Bunga Dadap Merah (Erythrina crista-galliL.) Rahmawati, Rahmawati; Nuryanti, Siti; Ratman, Ratman
Jurnal Akademika Kimia Vol 5, No 1 (2016)
Publisher : Universitas Tadulako

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Abstract

Dadap red (erythrina crista-galli L.) is belonged to the legumes (fabaceaea) family which, is one of the flowering shade plants that often used as an ornamental plant. This plant has a bright red flower, a taproot with root nodule bacteria nitrogen fixation and compound leaf consists three strands on each stem. This research is climed to proves that the extract of dadap red flower can be used as acid-base indicators. Dadap red flowers was macerated using methanol then filtered. The filtrate was ready to use as an acid-base indicator. The extract is tested in an acid-base, buffer solutions, and was compared with phenolphthalein for a strong acid with a strong base while a methyl orange a weak base with a strong acid. Based on the result, indicator of dadap red flower extrat in the strong acid was red colour, while in the weak acid was pink, and also in the strong base was dark green and in the weak base was purple. Furthermore, in the buffer solution, the indicator of dadap red flower extract gave four groups of colour change, namely red color at pH 1 to pH 6, colorless at pH 7 to pH 9, brown at pH 10 and blue at pH 11 to pH 12. Additionally, to attain the end point of titration, the indicators of dadap red flower extract gives a similar results with the comparison indicators. The results showed that the indicator of dadap red flower extracts can be used as an alternative indicator.
Pengaruh Model Pembelajaran Advance Organizer Terhadap Hasil Belajar Siswa SMA Negeri 3 Sigi pada Materi Larutan Elektrolit dan Non Elektrolit Maryam, Maryam; Ratman, Ratman; Ningsih, Purnama
Jurnal Akademika Kimia Vol 7, No 2 (2018)
Publisher : Universitas Tadulako

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Abstract

This study aimed to determine the influence of advance organizer learning model toward learning achievements of students at SMA Negeri 3 Sigi on the topic electrolyte and non-electrolyte solutions. This study was a quasi-experiment with pretest-posttest control group design using two groups of students, i.e. 34 Class X B as an experimental group , and 34 Class X A as a control group. Data of learning achievements of students was analyzed using t-test two parties statistical analysis. Results showed that the average values of experiment class (X1) was 77.15 with a standard deviation of 11.59, while the average values of control class (X2) was 68.44 with a standard deviation of 10.73. This testing hypotheses with statistical t-test two parties obtained -ttable ≤ tcount ³ + ttable (tcount = 10.89 and ttable = 2.00) with a significant level a = 0.05, and degrees of freedom 66. Therefore, H0 was rejected, and HI was accepted. This study concluded that advance organizer learning model influenced learning achievements of students at SMA Negeri 3 Sigi on the topic electrolytes and non-electrolyte solutions.
Pengaruh Penerapan Model Pembelajaran Kooperatif Tipe Numbered Head Together dipadu Contextual Teaching and Learning Terhadap Hasil Belajar Siswa SMA Imanuel Palu Yulinda, Lika; Mustapa, Kasmudin; Ratman, Ratman
Jurnal Akademika Kimia Vol 7, No 2 (2018)
Publisher : Universitas Tadulako

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Abstract

This study aim was to determine the influence of application of cooperative learning model type numbered head together combination with contextual teaching and learning toward learning outcomes of students in SMA Imanuel Palu. This study used quasi experimental design with non randomized pretest-posttest control group. Sample used were two classes, Xb (n=30) as experimental and Xa (n = 30) as control one. The test of student learning outcomes data used the t-test statistical analysis of the two parties. The results of data analysis obtained, the average score of experimental class () was 50.50 with a standard deviation of 9.79 and for control class () was 41.03 with a standard deviation of 11.01. The result of testing hypothesis with the statistical t-test of two parties obtained that –ttable < tcalculation > +ttable (tcalculation = 2.35 and ttable = 2.00) with a significance level α= 0.05 and 58 degrees of freedom, then H0 was rejected and Ha was accepted. The result of the data analysis showed that there was any in learning outcomes between students in experimental class and the control class, until concluded there is any influences of application of cooperative learning model type numbered head together combination with contextual teaching and learning toward learning outcomes of students in SMA Imanuel Palu.
Serbuk Dari Limbah Cangkang Telur Ayam Ras Sebagai Adsorben Terhadap Logam Timbal (Pb) Satriani, Dewi; Ningsih, Purnama; Ratman, Ratman
Jurnal Akademika Kimia Vol 5, No 3 (2016)
Publisher : Universitas Tadulako

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Abstract

The aim of this study is to determine the optimum time and weight required for eggshell powder when it absorbs Pb, and to determine the adsorption capacity of the eggshell powder at the optimum condition for Pb with the shaking time variation of 10, 20, 30, 40 and 50 minutes. The weight variation of adsorbent is 0.25, 0.50, 0.75, 1 and 1.25 grams. The work steps in this study were production of the eggshell powder as the adsorbent, making of a solution of Pb 60 ppm, and determination the Pb concentration at equilibrium using a spectrophotometer spektrodirect respectively. The results obtained after the adsorption process for the time variation was 30 minutes, this optimum time giving %Pb absorbed was 94.65%. The weight variation of adsorbent is 1 gram, this optimum weight giving %Pb absorbed was 98.91%. Furthermore, the absorption capacity adsorbent of eggshell powder in both optimum conditions was 0.078 mg Pb/mg adsorbent.
Analisis Perbedaan Kadar Vitamin C Buah Naga Merah (Hylocereus polyrhizus) Dan Buah Naga Putih (Hylocereus undatus) Yang Tumbuh Di Desa Kolono Kabupaten Morowali Provinsi Sulawesi Tengah Risnayanti, Risnayanti; Sabang, Sri Mulyani; Ratman, Ratman
Jurnal Akademika Kimia Vol 4, No 2 (2015)
Publisher : Universitas Tadulako

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Abstract

This study aims to determine the differences of vitamin C levels contained in the red dragon andwhite dragon fruits. The flesh and the skin of the dragon fruits were used as the samples and the fruitswere taken from Kolono Village, Morowali. Analysis of vitamin C levels in the samples was done byiodine titration method using starch solution as an indicator. The results showed that vitamin C levelsin the skin of red dragon fruit was 4.04 mg/100 g, while in the flesh was 5.28 mg/100 g. Levels ofvitamin C in the skin of white dragon fruit was 7.56 mg/100 g, while in the flesh was 7.92 mg/100g. The data indicate that vitamin C levels in the flesh and the skin of white dragon were higher thanvitamin C levels in the flesh and the skin of red dragon fruit. It can be seen that both of fruits havedifferent vitamin C levels.
Pemanfaatan Arang Aktif Biji Kapuk (Ceiba Pentandra L.) sebagai Adsorben Logam Timbal (Pb) Wahyuni, Sri; Ningsih, Purnama; Ratman, Ratman
Jurnal Akademika Kimia Vol 5, No 4 (2016)
Publisher : Universitas Tadulako

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Abstract

Lead is a heavy metal that has been a problem particulary in the aquatic environment. This reseach is an effort to reduce these problems by using adsorption method that utilizes an adsorbent of cotton seeds to Pb. Cotton seeds were chemically activated trough the process using a solution of 85% H3PO4. This study aims to determine the optimum weight of activated charcoal an adsoption capacity in optimum condition by using two parameter variations of weight of 0,3; 0,6; 0,9; 1,2 and 1,5 grams and Pb concentration of 10, 20, 30, 40 and 50 ppm by using a contact time of 30 minutes. Pb concentration was measured using a spectrophotometer spectro-direct. The result obtained that optimum weight of active charcoal cotton seeds was 1,2 grams with a percentage of 97,76% uptake an adsorption capacity in optimum condition Pb was 0,05 mg/mg activated charcoal.
Co-Authors Achmad Ramadhan Agustin Tiwow Agustina M., Renni Ahyar, Aditya Kurniawan Amalia, Maryam Amran Rede Anang Wahid M.Diah Andi Imrah Dewi ani ani Ardiansyah Asmaul Mufidah Asrini Asrini Azizah Azizah Basrudin, Basrudin Berlin, I Dewa Gede Cresna, Cresna Daud Karel Walanda Desman H. Seasi Dewi Satria Ahmar Dewi Tureni Endang Sutriani Esterlina Marpaung, Meida Firman P Guslan Guslan Hamdiana, Hamdiana Hanisa, Siti Hasrida Jabir Hayyatun Mawaddah Hikmawandari, Hikmawandari I Gusti Ngurah Antaryama I Ketut Suada I Made Tangkas Ikran, Ikran Irwan Irwan Ismail Ismail Jamaludin M Sakung Jannah, Nif’atul Kalsum A. M. Tobuali Karmila Langanawa Kasmudin Mustapa Kifli, Moh. Laparmin, Laparmin Lumbantobing, Ria Magfirah, Magfirah Maryam Maryam Masrah Masrah Mbosisi, Sifra Bertin Melyani Sari Sitepu, Melyani Sari Merionto Soilo Mery Napitupulu Minarni Rama Jura Miswan Miswan Moede, Fika Herlina Mohammad Jamhari Mono, Mono Muhamad, Sirhan Muhammad Agus Muljanto Muslimah Muslimah Najamuddin Laganing Nur Rahmawati Nur wahidah Nurdin Rahman NURLIANA NURLIANA Nurmin Nurmin Oce Oce Purnama Ningsih Purnama, Ririn Purniati, Ni Ketut Rahayu, Enny Rahmawati, Rahmawati Ramlah Ramlah Resni Taung Rewa, Zakiyah S. Risma, Iga Rismawati Rismawati Risnayanti, Risnayanti Rizwan, Mohd. Rosita Rosita Roswita Roswita Sabata, Nurlaela Samsidar Samsidar Sarni Djasa Satriani, Dewi Setianingsih, Rahmadiana Siang Tandi Gonggo Siti Hawa Siti Nuryanti Solfarina, Solfarina Sri Mariani Sri Mulyani Sabang Sri Wahyuni Sri Winarti Durandt Sumarni, Wiwin Suparmajid, Armin H. Timang, Selfiana Imu Umra Hi. A. Ambai Utarid, Sri Wardatul Jannah, Wardatul Yesnain Yesnain Yulianti, Selvi Yulinda, Lika Yusdin Gagaramusu Yusuf Kendek Paluin