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Suherman Suherman
Pendidikan Kimia Universitas Tadulako
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Education Environmental Science Health Professions Mathematics Medicine & Pharmacology Physics Public Health Other

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Penerapan Model Pembelajaran Kooperatif Tipe Snowball Throwing Terhadap Hasil Belajar Struktur Atom Kelas X Di SMA Negeri 1 Marawola Irna Vidianawati; Suherman Suherman; Vanny Maria Tiwow
Jurnal Akademika Kimia Vol 3, No 1 (2014)
Publisher : Universitas Tadulako

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Abstract

One of the indicators of the successful is the reachment of the students’ learning outcome on every subject taught belong to chemistry subject. This research conducted at SMA Negeri 1 Palu Marawola with the purpose of determining the difference of students’ learning outcome on chemistry subject which treated with cooperative learning model snowball throwing type with convensional learning on the material of atomic structure of the tenth grade students in SMA Negerei 1 Marawola. The population of the research was the tenth grade students in academic year 2013/2014. The sample was the Class E as the experimental class numbered 25 students and Class D as the control class numbered 25 students. The technique of data collection done through achievement test on chemistry subject particularly on atomic structure validated at first. The result of testing used two tailed t-test statistics analysis with prerequisite that is normality and homogenity tests. The data analysis result obtained the average score on experimental class = 75.04 and for the control class the average score obtained = 68. Based on the hypothesis with two tailed t test statistics it obtained the value of t counted =7.45 and t table = 2.02 at α = 0.05. In this case H1 was accepted and H0 was rejected because t counted was on the area of H0 rejection. It showed that there was a difference of students’ learning outcome through the application of cooperative learning snowball throwing type and convensional of the tenth grade students of SMA Negeri 1 Marawola.
Adsorpsi Ion Tembaga (Cu) Dan Ion Besi (Fe) Dengan Menggunakan Arang Hayati (Biocharcoal) Kulit Pisang Raja (Musa sapientum) Nirmala Nirmala; Vanny M. A. Tiwow; Suherman Suherman
Jurnal Akademika Kimia Vol 4, No 4 (2015)
Publisher : Universitas Tadulako

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Abstract

This study determine the contact time, pH, and the optimum concentration of the solution of copper (Cu) and iron (Fe) from skin the plantain (musa sapientum). Advances in the industry today resulted in many human activities that caused increasing impact of the pollution on surrounding of the environment. Environmental pollution by heavy metals being a serious problem along with increasing the use of heavy metals in the industry. The method used in this study was a laboratory experiment using colorimeter. The results showed that the adsorption of copper and iron on the plantain bark influence a time variation of Cu and Fe occurred in the 60 minute and 30 minute (99.64% and 99.54%); variation of pH for Cu and Fe occurrs in pH 4 and pH 3 (99.62% and 99.58%) and variation of concentration for Cu and Fe occurred at 20 ppm and 1 ppm (80.74% and 96.81%), respectively.
ANALISIS ASPEK KESULITAN MENYELESAIKAN SOAL-SOAL STOIKIOMETRI BAGI SISWA KELAS X SMA NEGERI 6 PALU Eka Anisyah Miftahul Jannah; Supriadi Supriadi; Suherman Suherman
Jurnal Akademika Kimia Vol 2, No 1 (2013)
Publisher : Universitas Tadulako

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Abstract

The difficult aspect of solving stoichiometry problems for class X student need more attention. The aim of this research is to provide an overview of students’ ability in solving stoichiometry problems from cognitive aspects, and to determine the subject and the degree of students difficulty in solving Stoichiometry problems. The research subjects are students of class X Senior High School 6 Palu of the school year 2012/2013.The research sample consisted of two classes, namely Xa classes with 17 students and classes Xd with 17 students. An essay test with 13 items of question which has been validated by the school teacher are the instrument. The results of this descriptive study shown that difficulties students in the C1 cognitive aspect (Knowledge) about 11.86% with very low category, C2 (Comprehension) of 42.08% with moderate category and C3 (Application Concept) about 62.29% with a high category, and the student’s difficulties in determining the amount of moles about 46.68% with moderate category, in determining the molar mass about 36.85% with low category, the molar volume about 44.61% with a medium category, in understanding and applying Avogadro’s hypothesis and the number of moles of gas about 44.61% with moderate categories, in determining empirical formula and molecular formula about 58.96% with moderate category, hydrate compounds about 64.63% with high category, percentage of elements in compound about 56.15% with medium category, limiting reagent about 67.86% with the high category, the number of reactants or reaction products 80.10% with the high category. The conclusion is that the most difficult aspects of cognition are at C3 (Application Concepts), and the most difficult subject is to determine limiting reagents and hydrate compounds.
Penerapan Blending Kitosan-Tonasi Terhadap Pertumbuhan Dan Produktivitas Buah Kakao (Theobroma cacao L.) (Studi Wilayah Kabupaten Sigi) Nur Asmara; Suherman Suherman; Siang Tandi Gonggo
Jurnal Akademika Kimia Vol 4, No 3 (2015)
Publisher : Universitas Tadulako

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Abstract

The cocoa (theobroma cacao L.) plant is one of the plantation crops which has an economic potential value. Chitosan and cacao tonnage are potential to be used as nutrients in cacao plant. This research was aimed to use blending chitosan and tonnage dust of cocoa as a suplement in cocoa plant. Method of the research used comparisons of the amount of capsule blending chitosan and tonnage for fertilizing. Comparisons of the blending chitosan tonnage used as the test groups were 16 capsules, 12 capsules, and 8 capsules added by pesticide. As a positive control was the commercial fertilizer with additional of pesticide, and the negative control used only pesticide. Physical observations before and after treatments showed that the test groups and the positive control were able to reduce the amount of tonnage, and improved quality of the skin and the cocoa beans. Each group of 16 capsules, 12 capsules, 8 capsules, positive control and negative control produced weight for every three cocoa beans of 129.25 g, 128.88 g, 96.87 g, 115.22 g, and 44.76 g, respectively. While the cocoa fat level analysis of each sample showed 54.53%, 52.60%, 52.02%, 51.87%, and 48.39%, respectively. It can be concluded that the blending chitosan tonnage increased the productivity and the quality of cocoa beans.
Akumulasi Timbal (Pb) Dan Tembaga (Cu) Pada Ikan Kuniran (Upeneus Sulphureus) Di Perairan Estuaria Teluk Palu Dessy Amalia Lubis; Irwan Said; Suherman Suherman
Jurnal Akademika Kimia Vol 3, No 2 (2014)
Publisher : Universitas Tadulako

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Abstract

Estuarine waters is the meeting place of various estuaries to the open sea, which causes the estuarine water vulnerable to pollution by heavy metals. The source of pollution in the waters may come from gold mining activities, workshop waste, agricultural waste, motor vehicles activities, and domestic industrial activity. The pollutant materials may vary and one of which is heavy metal such as Pb dan Cu. Estuarine water of Palu Bay extends along a semicircle around the city. The bay is also the source of income of the lical fishermen. One of the commodity fish in the water is yellow goat fish (Upeneus sulphureus).This study aimed to determine the levels of lead (Pb) and copper (Cu) containing in yellow goat fish (upeneus sulphureus) that live in the water of the Palu gulf, Central Sulawesi Tengah. This study started by making field notes on the observation around Palu Bay. The next stage is to do the yellow goat fish sampling (Upeneus sulphureus) in the Palu Gulf then continuing to conduct the research in the chemistry Laboratory in Teacher Training and Education Factulty. To measure the level of lead and copper metal in yellow goat fish (Upeneus sulphureus) in Palu Bay, the researcherof, employed Direct Spectro tool. The data obtained were analyzed descriptively, which compared to the standard quality of food by the General Director of Drug and Food Control No. 03725/B/SK/VII/89 and ISO 7387:2009. The results showed that levels of lead metal in yellow goat fish (upeneus sulphureus) were 0,567 mg/kg, meaning that the levels of lead metal has exceeded the threshold value of the specified foods (0,3 mg/kg). While the copper metal content in yellow goat fish (Upeneus sulphureus) was 2,237 mg/kg and still below the specified threshold (5 mg/kg).
Analysis of the Ability to Understand the Basic Law of Chemistry for Science High School Students Irma Ragentu; Suherman Suherman
Jurnal Akademika Kimia Vol. 11 No. 2 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2022.v11.i2.pp117-121

Abstract

This study aimed to describe the student's capability of grade XI Science at SMA 3 Palu in understanding Fundamental Chemical Laws. This study was a qualitative descriptive study. The sample was students in the class XI Science 7, which amounted to 29 students, and XI Science 8, which amounted to 31 students. The sample was determined based on nonprobability sampling with a purposive technique based on the suggestions from the chemistry teacher that the two classes were homogeneous. Data were obtained from the test of students' understanding of fundamental Chemical Laws consisting of six essay questions and supported by the interview results. Respondents for the interview were six students based on the categorization of high, medium, and low scores, which were obtained from the calculation of the average score of students and standard deviation. The results showed that the capability on understanding Fundamental Chemical Laws of students of grade XI Science at SMA 3 Palu which was included in the high category was the ability to interpret as much as 79.58%, and included in the sufficient category was the ability to classify as much as 56.25%, while those included in the low category was the ability to exemplify, conclude, compare, and explain, with successive as much as 30, 24.58, 32.08, and 40.42%, respectively.
Analysis of Vitamin C Levels and Antioxidant Activity in Red Dragon Fruit (Hylocereus polyrhizus) Intan Pratiwi; Suherman Suherman
JURNAL BANUA OGE TADULAKO Vol 1 No 1 (2021)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (217.273 KB) | DOI: 10.22487/jbot.v1i1.1354

Abstract

Research on the analysis of vitamin C levels and antioxidant activity in red dragon fruit (Hylocereus polyrhizus) has been carried out using UV-Vis spectrophotometry. In this study, fresh dragon fruit flesh was mashed with a blender and the maceration method with 96% absolute ethanol solvent was carried out three times. The meseration results were evaporated using a rotary evaporator to obtain a thick extract. In the DPPH free radical scavenging test and the determination of vitamin C levels in red dragon fruit extract (Hylocereus polyrhizus) the original vitamin C was used as a comparison. In determining the levels of vitamin C in the extract, the extract solution was made with a concentration of 1000 ppm which was determined by UV-Vis spectrophotometry, showing that the levels of vitamin C in the extract of red dragon fruit (Hylocereus polyrhizus) had an average vitamin C content of 31.413 mg/100g. In the antioxidant activity test of the extract solution, various concentrations were made, namely 50 ppm, 100 ppm, 150 ppm, 200 ppm and 250 ppm, the average percentage of antioxidant activity was 19,859
Kinetika Reaksi Hidrolisis Pati Biji Alpukat (Persea americana Mill) dengan Katalis HCl Sitti Rahmawati; Asnila Asnila; Suherman Suherman; Paulus Hengky Abram
JIPI (Jurnal IPA dan Pembelajaran IPA) Vol 4, No 1 (2020): JUNE 2020
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jipi.v4i1.16480

Abstract

One of the plants that can be used as raw material for making sugar is plants that contain starch content such as avocado seeds. This study aims to determine the reaction order, the reaction rate constant from the hydrolysis of avocado seed starch using HCl. The method of this research is to determine the optimum concentration of HCl hydrolysis reaction from avocado seed starch using various concentrations of HCl (0.5 M; 1 M; 1.5 M; 2 M; 2.5 M) at the optimum temperature and stirring time (90oC for 70 minute). The hydrolysis process was followed by neutralization using 5 M NaOH solution and evaporated to obtain concentrated glucose, glucose was analyzed qualitatively and quantitatively by the Benedict method and the phenol sulfuric acid method. Based on the results of the maximum glucose levels obtained from the hydrolysis of variations in the concentration of HCl avocado seed starch, HCl 1.5 M. Furthermore, determine the kinetics of the starch hydrolysis reaction using time variations (30, 40, 50, 60 and 70) minutes at 90oC and concentrations The HCl 1.5 M. reaction order is determined by the intral method and the graph method. Determination of the first order graph method is done by plotting the value of ln [A] versus time, while the second order by plotting the value of 1 / [A] versus time. The first order with a 93% confidence level was obtained from the value of R2 = 0.9312, while the second order was 85% obtained from the value of R2 = 0.8581. Determination of the order of the integral method k value tends to remain in the first order formula with an average of k = 0.01962 minutes-1. Based on the two methods, it can be determined that the kinetics of the avocado seed starch hydrolysis reaction follows a first-order reaction.
Hubungan Profesionalitas dan Motivasi Kerja Dengan Produktivitas Kinerja Guru Sekolah Dasar di Kecamatan Palu Timur Hartati Is Mentemas; Andi Tanra Tellu; Suherman Suherman
Mitra Sains Vol 7 No 2 (2019): Mei
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/mitrasains.v7i2.279

Abstract

This research aimed to describe and to analyze effect the profesional ity and work motivation with performance of elementary school teachers in Palu Timur. The research is quantitative research used survey method on distributed 571 teachers in Palu Timur. The sample teachers were 142 persons. The research data were collected by using a questionnaire and analyzed by SPSS 14.0 version and MS Excel. Based on the analyses: (1) there is a significant effect between profesional ity and performance; (2) there is a significant effect between work motivation and performance; and (3) there is a significant effect between profesional ity and work motivation together with work performance of the elementary school teachers at Palu Timur.
Lead Metal Adsorption from its Solution using Seagrass Biomass Enhalus Acoroides Siti Masita; Irwan Said; Suherman Suherman
Jurnal Akademika Kimia Vol. 9 No. 3 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i3.pp158-161

Abstract

Seagrass is one of the macrophyta plants containing enough biomass. Recently, seagrass has been used for filtering waste, drugs and sources of chemicals. Seagrass also functions to stabilize the soft bases where most species grow, especially with solid root systems and cross each other.  Therefore, seagrass has the potential to absorb heavy metal ions from the solution. This research aimed to determine the optimum weight and optimum contact time for Pb metal adsorption. Weight variation of seagrass biomass was 60, 90, and 120 mg while variation in contact time was 60, 90, and 120 minutes. The results obtained optimum weight of seagrass biomass to absorb Pb metal was 60 mg with 98.42% Pb absorbed, and optimum contact time for seagrass biomass to absorb Pb metal was 60 minutes with 95.45% Pb absorbed.
Co-Authors Afadil Agustin Tiwow Andi M. Rendi Andi Tanra Tellu Asnila Asnila Baharuddin Hamzah Burhan Burhan Dessy Amalia Lubis Detris Poba Eka Anisyah Miftahul Jannah Elvian Togagu Etty Etty Fina Edyanti Gavrila Gavrila Hartati Is Mentemas I Made Tangkas Ijirana Indah Puspasari Kiay Demak Intan Pratiwi Irma Ragentu Irna Vidianawati Irwan Said Jeane Maria Mustika Tonahi Kasmudin Mustapa M. Yusi Prilina Bertus Megawati Megawati Melisa Arsad Nirmala Nirmala Nur Asmara Nur Azizah Nur H. Wahyuni Nur Intan A. Sumarau Nurfauzia Nurfauzia Paulus Hengky Abram Purnama Ningsih Sayid Z. S. Alwi Siang Tandi Gonggo Siang Tandi Gonggo Siti Masita Siti Nuryanti Siti Rabiah Laonu Sitti Rahmawati Sri Mulyani Sabang Supriadi Supriadi Tahril Wayan A. K. Mahardika Widya Astuti