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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 8 Documents
 1 
Search results for , issue "Vol 3, No 2 (2014)" : 8 Documents clear
Metode Everyone is Teacher Here Pada Materi Ikatan Kimia di Kelas X SMAN 1 Marawola Milawati, Milawati; Pursitasari, Indarini Dwi; Tangkas, I Made
Jurnal Akademika Kimia Vol 3, No 2 (2014)
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. This research uses learning Everyone is Teacher here method (ETH). The aim of this research was to determine the influence of the use of ETH methods on chemical content on learning outcomes and communication skills at tenth grade student of SMAN 1 Marawola generation 2013/2014, the sample of research was class XF as a class experiment with the application of learning ETH method (n = 20) and class XB as a control class without the use of learning ETH method (n = 21). Data were collected by observation, initial test, and final test. The data were analyzed by descriptively and right side t-test. The results of the analyzed of the data shows the average score in the experimental class = 83.95 and for control class = 70.36, both classes distributed were normally and have the variance (F test) are homogeneous. Testing hypotheses t test obtained tcount = 5.57 > ttabel = 1.68 with a significance level (α) = 0.05. In this case H1 was accepted and H0 was rejected, because of tcount were in H0 rejection region. The results suggest the application of learning ETH method has posirive side on learning outcomes and student communication skills in chemical material.
Distribusi Unsur Hara N dan P dalam Sedimen di Ekosistem Lamun (Seagrass) di Wilayah Pesisir Desa Kabonga Besar Kabupaten Donggala Silvia, Mega; Tiwow, Vanny M.A.; Said, Irwan
Jurnal Akademika Kimia Vol 3, No 2 (2014)
Publisher : Universitas Tadulako

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Abstract

This research aims to determine the distribution patterns and concentrations of nitrogen and phosphorus nutrients in the sediment at the coastal region of seagrass ecosystems Kabonga Besar village Donggala district. Phosphorus (P) and nitrogen (N) in water its are nutrient that is essential for the growth of phytoplankton. This research was carried out by quantitative analysis using a nitrogen compound Kjeldhal method which consists of three phases: destruction, distillation, and titration, while for phosphorus compound using UV-Vis spectrophotometric method. The results showed that the lowest levels of nitrogen were obtained at the level of fertility sea grass sediments are less abundant range of 0.05% - 0.06% , on the contrary sea grass abundant fertility rate which ranges from 0.07% - 0.09%. For the highest levels of phosphorus nutrients contained in the water that is abundant on sea grass fertility ranged from 4.335 - 4.387 mg/100, and the lowest was ranged from 2.292 - 2.358 mg/100. Based on the data obtained it can be concluded that the content of nitrogen and phosphorus nutrients in sediments sea grass at the research area was still relatively low, it could affect the growth of seagrass.
Analisis Kadar Mineral Natrium dan Kalium Pada Daging Buah Nanas (Ananas comosus (L) Merr) di Kota Palu Sada, Nurjayanti Abdullah; Rahman, Nurdin; Supriadi, Supriadi
Jurnal Akademika Kimia Vol 3, No 2 (2014)
Publisher : Universitas Tadulako

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Abstract

Mineral is inorganic component which is in the human body. The needs of mineral for the body can be obtained by consuming fruits. Pineapple (Ananas comosus (L) Merr) is one of fruits contains mineral such as potassium (K) and sodium (Na). the objective of the research was to analysis the mineral level (Na and K) contained in pineapple flesh that spread out in Palu City. The analysis of Na and K mineral level used flame photometry analysis. The research result show that pineapple Cayenne varieties (common pineapple) contains sodium mineral as much 3.71 mg/kg and potassium as much at 376 mg/kg. The pineapple Queen varieties (Bogor pineapple) contains mineral sodium as much as 2.41 mg/kg and potassium as much as 198 mg/kg.
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).
Pengaruh Model Pembelajaran Kooperatif Tipe NHT (Numbered Heads Together) Terhadap Hasil Belajar Siswa Kelas XI IPA SMA Negeri 1 Dolo Pada Materi Pelajaran Kimia Koloid Febiliyanti, Rezha; Tiwow, Vanny M.A.; Gonggo, Siang Tandi
Jurnal Akademika Kimia Vol 3, No 2 (2014)
Publisher : Universitas Tadulako

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Abstract

This research is motivated by low achievement and lack of chemistry students in learning activities especially on the subject of colloids. Based on observations in SMA Negeri 1 Dolo, it has known that the process of teaching and learning suggests that teachers in teaching chemistry concepts and theories through learning activities centered on the teacher or just direct instruction, students were not actively engaged in activities and less opportunity to develop the students thinking process, so the learning process tends boring and turned to student learning laziness. These problems could be overcome by using a type of learning model NHT (Numbered Heads Together). This study aims to figure out the Effects of Cooperative Learning Model Type NHT (Numbered Heads Together) on Student Results of Class XI IPA SMAN I Dolo on topic Colloids. The population in this study was the students of class XI SMA Negeri 1 Dolo 2012/2013 school year, and the research sample was 33 students of class XI IPA 3 as the experimental class (learning by using NHT), and 34 students of class XI IPA 2 as a control class (direct learning). Data were obtained by providing post-test to both samples group. After that, the data were analyzed to test the hypothesis by using one tail t-test. The average and the deviation standard obtained for the experimental class was 64.15 and 10.75. While the average and deviation standard for control class was 53,03 and 10,21. Based on t-test analysis, it can be concluded that the learning outcomes of students who use cooperative learning model NHT (Numbered Heads Together) is higher than student learning outcomes using direct instructional model.
Identifikasi Flavonoid Pada Ekstrak Bunga Kembang Merak (Caesalpinia Pulcherrima) Dan Aplikasinya Sebagai Indikator Asam Basa Irwan, Irwan; Supriadi, Supriadi; Sakung, Jamaluddin
Jurnal Akademika Kimia Vol 3, No 2 (2014)
Publisher : Universitas Tadulako

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Abstract

Kembang merak flower (caesalpinia pulcherrima) is one of the ornamental plants, easily cultivated and its colour is yellowish red which also containing flavonoids. This research aims to identify the flavonoid compounds of kembang merak flower as acid-base indicator. It was done through the extraction of Kembang Merak using methanol as solvent. The extract separated by thin layer chromatography (TLC) using the eluent of BAA (butanol : acetic acid : water) (4 : 1 : 5) as an appearance of stains used ammonia vapour. TLC kromatogram results showed that there were two components with Rf 0.58 and 0.89. Both of the components separately scarapped then dissolved in methanol and measured absorbance at a wavelength 0f 200-600 nm using UV-Vis spectrophometer T80. Component I identified as isoflavones, khalkon, and auron whereas component II identified was not. For the comparison of kembang merak in solution of acid was red and base was green. The titration of strong acid-strong base of the kembang merak extract have have changed the colour in pH 9.51-11.38 pink to green, while titration of a weak acid-strong base have change the colour of light orange to green at pH 9.22-11.59 and for titration of strong acid-weak base colour changing light greenish into orange with a pH range from 2.73 to 1.93. The extract of kembang merak flower can be applied phenolphthalein has been applied.
Penentuan Kondisi Optimum Ekstraksi Ion Timbal(II) Menggunakan Teknik Emulsi Membran Cair Alam, Syamsu; Hamzah, Baharuddin; Nuryanti, Siti; Nurbaya, Siti
Jurnal Akademika Kimia Vol 3, No 2 (2014)
Publisher : Universitas Tadulako

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Abstract

A research on the extraction of lead(II) ion has been done using emulsion liquid membrane technique. This research used a laboratory experiment method by using benzoyl acetone as a carrier, paraffin liquid as the membrane, a solution of nitric acid as an internal phase, Span-80 as surfactant, and a solution of lead(II) as the sample solution. This research was conducted to determine the optimum extraction condition of lead(II) ions in solution which includes a volume ratio of emulsion to external phase and extraction capacity of lead(II) ion by emulsion liquid membrane technique. The volume ratio of emulsion to external phase used was 1:5, 1:6, 1:7, and 1:8. While the variation of concentration of lead(II) used was 220 ppm, 434 ppm, 695 ppm, and 817 ppm. The determination of the concentration of lead(II) ions in external phase is done by using a spectrophotometer SpectroDirect. The results of this research showed that the volume ratio of emulsion to external phase were in the maximum extraction percentage; 1:6 ratio. Moreover, the concentration of lead(II) were in maximum extraction percentage of 220 ppm with extraction percentage of 56.36%.
Analisis Kualitas Minyak Nilam (Pogostemon cablin Benth) Produksi Kabupaten Buol Ahmad Idris; Minarni Rama Jura; Irwan Said
Jurnal Akademika Kimia Vol 3, No 2 (2014)
Publisher : Universitas Tadulako

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Abstract

Patchouli ( pogostemon cablin benth ) is one of the essential oil producing plants which are quite important, known as Oil Patchouly. This oil pick strategic potential in the world market which is used as a binder fragrance in perfumes, cosmetics, pharmaceutical industry, and other industries. Buol which aims to determine the quality of patchouli oil. Samples is patchouli oil yield Buol. Parameters in meticulous ie specific gravity, refractive index, acid Numbers, Numbers Esther, and Solubility in Alcohol. The technique used is the technique of sampling area. The results showed that the Weighted Value Type 25oC / 25°C for samples A = 0.997 to 1.000, B = 0.962 to 0.965, C = 0.995 to 0.998 D = 0.980 to 0.983, and E = 0.968 - 0.971. To value Bias Index ( nD20 ) ie sample A = 1.45505 to 1.45705, B = 1.45506 to 1.45706, C = 1.45504 to 1.45704, D = 1.45503 to 1.45703, and E = 1.45523 to 1.45723. Numbers for acid sample value A = 2.805, B = 3.366, C = 2.5245, D = 3.0855 and E = 3.6465. For esther numbers are sample values A = 15.4275, B = 5.61, C = 12.6225, D = 4.2075 and E = 19.635. And last is the determination of solubility in alcohol that sample A = 1 : 2, B = 1 : 1.7, C = 1 : 0.9, D = 1 : 1, and E = 1 : 3. These data show patchouli oil production Buol area has good quality in terms of acid value, ester number and solubility in alcohol is the average Indonesian National Standards meet the standards and ISO. While the specific gravity and refractive index still does not meet the Indonesian National Standard and ISO.

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