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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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Penggunaan Model Pembelajaran Kooperatif Tipe Think-Pair-Share (TPS) Pada Pokok Bahasan Struktur Atom Untuk Meningkatkan Hasil Belajar Siswa Kelas X SMA Negeri 2 Palu Fajaryanti, Desi Eka; Tiwow, Vanny M. A.; Rahman, Nurdin
Jurnal Akademika Kimia Vol 3, No 3 (2014)
Publisher : Universitas Tadulako

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Abstract

The purpose of this research was to investigate the students’ learning outcomes toward the use of cooperative learning model of Think Pair Share (TPS) on the topic of atomic structure to the tenth year students of SMA 2 Palu. The method used was an experimental research. The population was the tenth year students of SMA 2 Palu in the academic year of 2012/2013. The research used purposive sampling technique (based on the specific reason: the two classes have the same average scores of class). The sample consisted of 32 X-A students as the experimental class (Think Pair Share (TPS) technique) and 32 X-D students as the control class. The data collection was through test on atomic structure. The testing of research data used statistic analysis one tale t-test (right) by employing its prerequisite test of normality and homogeneity. The average score of the experimental class was 12.63 with the deviation standard of 2.82 and of the control class was 9.89 with the deviation standard of 2.70. Based on the hypothesis testing, it was found that tcounted value >ttable or 3.98 > 1.66 with degree of significance of 00.5 and degree of freedom = 62. The Ho was rejected. It is concluded that the learning outcome by using cooperative learning of Think Pair Share technique on the topic of nuclear structure is higher than that of the conventional technique.
Penerapan Model Pembelajaran Kolaboratif dengan Teknik Learning Cell pada Materi Kelarutan dan Hasil Kali Kelarutan Pada Siswa Kelas XI SMA Negeri 6 Palu Panontji, Putri Ningsi A.; Sabang, Sri Mulyani; Mustapa, Kasmudin
Jurnal Akademika Kimia Vol 7, No 2 (2018)
Publisher : Universitas Tadulako

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Abstract

This study was conducted to determine the difference on students learning outcomes in the classroom implemented with collaborative learning model using cell learning technique on the topic of solubility and solubility product in the class XI at SMAN 6 Palu. This study was a quasi-experiment research with pretest-posttest control group design. Population in this study were students of class XI IPA at SMAN 6 Palu enrolled in the academic year of 2015-2016 amounting to 43 student. Sampling technique was a sampling saturated. Samples in this study were 21 students in the class XI IPA2 as the experimental class, and 22 students in the class XI IPA1 as the control class. The results showed that the output rank for the mean value of the experimental class was bigger than the control class, 30.29> 14.09. The output statistic test showed sig. 2-tailed 0.00 < 0.05, and Zcount (-4.25) < Ztable (-1.64). These mean that H0 was rejected and Ha was received. Therefore, it can be concluded that there is significant difference in learning outcomes between the class which implement collaborative learning model with learning cell technique, and the classes which implement traditional learning model on the topic of solubility and solubility product in the Class XI at SMAN 6 Palu.
Analisis Kadar Karbohidrat, Lemak Dan Protein Dari Tepung Biji Mangga (Mangifera indica L) Jenis Gadung Qalsum, Umi; Diah, Anang Wahid M.; Supriadi, Supriadi
Jurnal Akademika Kimia Vol 4, No 4 (2015)
Publisher : Universitas Tadulako

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Abstract

Mango (Mangifera indica L) seeds never to used, so they need efforts to be as food ingredients such as flour. Gadung mango seed was one type of mango seeds used as flour. This study aims to determine the nutrient content i.e. carbohydrates, fats, and proteins of Gadung mango seed flour produced through sulfurization and without sulfurization. Sodiumbisulfite (NaHSO3) with a concentration of 730 ppm was used for mango seed soak for 4 hours at sulfurization stage. The results showed that the Gadung mango seed flour through sulfurization had levels of 13.89% carbohydrate, 12.94% fat and 8.48% protein, while the mango seed flour without sulfurization had levels of 20% carbohydrate, 14.83% fat, and 4.84% protein. The technique of sulfurization on making mango seed flour can reduce levels of carbohydrates and fats as well as maintaining the protein content.
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.
Uji Kualitatif Senyawa Metabolit Sekunder Pada Daun Palado (Agave Angustifolia) Yang Diekstraksi Dengan Pelarut Air Dan Etanol Ergina, Ergina; Nuryanti, Siti; Pursitasari, Indarini Dwi
Jurnal Akademika Kimia Vol 3, No 3 (2014)
Publisher : Universitas Tadulako

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Abstract

Study on qualitative test of secondary metabolites compounds has been done on Palado leaves (Agave angustifolia) extracted in water and ethanol by maceration technique. The aim of this research was to determine the chemical content of Palado leaves. The methode used was phytochemical scrinning (qualitative test) using test tube to determine type of the active compounds contained in the plant. Chemicals tested in this study were alkaloids, terpenoids, steroids, flavonoids, and tannins. Components of Palado leaves extracted in water and ethanol were analysed by colour test using several reagents to determine alkaloids, terpenoids, steroids, flavonoids, and tannins. Specific reagents used in this study interacted with the sample based on the principle of ‘like dissolve like’. The results showed that the water and ethanol extracts of Palado leaves contained alcaloids, flavonoids dan tannins.
PENGARUH LAMA PENYIMPANAN DAN KONSENTRASI NATRIUM BENZOAT TERHADAP KADAR VITAMIN C CABAI MERAH (Capsicum annuum L) (The Effect Of Length Storage And Sodium Benzoat Concentration On The Vitamin C Levels Of Red Chili (Capsicum annuum L) Oktoviana, Yanti; Aminah, Sitti; Sakung, Jamaluddin
Jurnal Akademika Kimia Vol 1, No 4 (2012)
Publisher : Universitas Tadulako

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Abstract

Red chillies (Capsicum annuum L) are considerable horticultural crops widely grown in Indonesia, which has a high value and demand in market. Besides it contains higher vitamin C (ascorbic acid) and beta-carotene than other fruits such as papaya, mango, pineapple and watermelon, red chillies has a very low storability as it is susceptible to decay and the over-production of chili resulting in postharvest decay. To prevent the decay, red chillies are preserved using preservatives. Preservative used in this study is sodium benzoate since it is claimed as an effective against fungi. This study aimed to determine the effect of the concentration of sodium benzoate against storage time of red chillies (Capsicum annuum L) and also to determine the effect of the concentration of sodium benzoate levels towards vitamin C in preserved red chili. The method used in this experiment was a laboratory experiment using a visible spectrophotometry. The results showed that the use of sodium benzoate as a preservative can extend the storability of red chillies and sodium benzoate concentration also affect levels of vitamin C contained in red chillies. The level obtains at the highest concentration of 1.5% which is 54 mg/100 g with 8 days of storability.
Pengaruh Konsentrasi Getah Pohon Kayu Jawa (Lannea Coromandelica) Terhadap Konduktivitas Membran Blend Kitosan-Polivinil Alkohol-Litium Sebagai Membran Elektrolit Masriana, Masriana; Napitupulu, Mery; Gonggo, Siang Tandi
Jurnal Akademika Kimia Vol 6, No 3 (2017)
Publisher : Universitas Tadulako

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Abstract

This research aims to study the concentration effect percentage weight of kayu jawa latex on the conductivity of membranes made from chitosan-PVA-lithium. The ionic conductivity of the membrane chitosan-PVA-lithium-latex kayu jawa was measured by impedance spectroscopy. The measurement results showed that membrane with the addition of 15% latex kayu jawa provided the highest conductivity values of 10.99353 x 10-4 S/cm. Characterization of the polymer electrolyte batteries that made from chitosan-PVA-lithium with the addition of latex kayu jawa have voltage of 1.5 Volts compared to commercial batteries that have tension was 1.5 Volts. These results indicated that latex kayu can be used as a filler to increase the ionic conductivity.
Uji Aktivitas Antioksidan Ekstrak Buah Merah (Pandanus baccari L) Di Daerah Poso Sulawesi Tengah Sangkala, Serti A.; Jura, Minarni Rama; Tangkas, I Made
Jurnal Akademika Kimia Vol 3, No 4 (2014)
Publisher : Universitas Tadulako

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Abstract

Research on the antioxidant activity test has been done on red fruit (pandanus baccari L) from Poso area Central Sulawesi. This research was conducted by laboratory experiments using maceration extraction techniques, DPPH (1,1-diphenyl-2-pikrilhidrazil) as free radicals, vitamin C as positive control, UV-Vis spectronic as a tool for antioxidant test, and red fruit extracts as samples. The aim of this research was to determine antioxidant strength of red fruit extracts. The red fruit sample was used as much as 30 grams, and the solvent was an absolute ethanol, whereas variations in the concentration of red fruit extracts used were 20 ppm, 40 ppm, 60 ppm, and 80 ppm. Antioxidant activity test was done by using a UV-Vis spectronic and IC50. The results showed that the red fruit extracts had strong antioxidant activity with the percentage of optimum activity in inhibiting free radical by 81.02%, and the IC50 value was 14.454 ppm.
ANALISIS LOGAM TIMBAL (Pb) DAN BESI (Fe) DALAM AIR LAUT DI WILAYAH PESISIR PELABUHAN FERRY TAIPA KECAMATAN PALU UTARA (The Analysis of Lead (Pb) and Iron (Fe) Metals in The Sea Water of Coastal Area of Taipa’s Ferry Harbor Subdistrict of North Palu) Ika, Ika; Tahril, Tahril; Said, Irwan
Jurnal Akademika Kimia Vol 1, No 4 (2012)
Publisher : Universitas Tadulako

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Abstract

The analysis of lead (Pb) and iron (Fe) have been done in Taipa’s sea water. The objective is to determine the level of lead and iron metals using spectrophtometry method. The sea water samples were taken in the morning and afternoon at three different places. The distance of 3 samples are approximately 5 m, 10 m, and 15 m from the harbour and about 5 m from the seashore. The result of the analysis level of lead and iron metals from 3 points for lead taken in the morning, point A is 0.919 mg/L, point B is 0.703 mg/L, and point C is 0.810 mg/L. While, taken in the afternoon, the lead level point A is 0.729 mg/L, point B is 0.837 mg/L, and point C is 0.729 mg/L. For the iron level taken in the morning, point A is 0.394 mg/L, point B is 0.546 mg/L, and point C is 0.324 mg/L. Meanwhile, in the afternoon the iron level, point A is 0.449 mg/L, point B is 0.365 mg/L, and point C is 0.504 mg/L. The concentration of lead metal in the sea water is in range 0.703 mg/L – 0.919 mg/L. The concentration is higher than limit ranges value of lead metal 0.025 mg/L. The concentration of iron metal in the sea water of Taipa’s harbor is about 0.324 mg/L – 0.546 mg/L. It’s concentration is higher than limit for value iron metal 0.01 mg/L.
Arang Eceng Gondok (Eichornia crassipes) sebagai Adsorben Fenol pada Limbah PLTU Palu Tudjuka, Mora Delfita; Walanda, Daud K.; Hamzah, Baharuddin
Jurnal Akademika Kimia Vol 6, No 2 (2017)
Publisher : Universitas Tadulako

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Abstract

This study aims to determine the optimum capacity and weight of water hyacinth aroma to the adsorption capacity of phenol in Palu PLTU waste. The steps taken in this research are a sampling of PLTU waste, making of adsorbent, determination of phenol concentration in PLTU waste and determination of phenol concentration at equilibrium using a Spektrodirect spectrophotometer. The adsorption capacity of water hyacinth at optimum condition of phenol was determined by weight variations of 10, 20, 30, 40 and 50 mg. The resulting result after adsorption process for adsorption weight at the weight of charcoal 10 mg = 82.78%, 20 mg = 89.13%, 30 mg = 85.49%, 40 mg = 79.72% and 50 mg = 74, 42 %. The optimum weight of charcoal in phenol absorb is 20 mg with% phenol which is absorbed 89.13%. The capacity of adsorbent hailing of water hyacinth scent at optimum condition of 3.03 mg phenol/g of adsorbent.

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