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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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Pengaruh Model Pembelajaran Guided Inquiry dengan Mind Map terhadap Hasil Belajar dan Motivasi Siswa pada Materi Redoks di Kelas X SMA Negeri 5 Palu Lumentut, Regina S.; Said, Irwan; Mustapa, Kasmudin
Jurnal Akademika Kimia Vol 6, No 2 (2017)
Publisher : Universitas Tadulako

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Abstract

This study aimed to investigate the effect of guided inquiry learning model with mind map toward learning achievement and motivation of students on Reduction-Oxidation in Class X at SMA 5 Palu. This study was a quasi-experimental design with a non-randomized pretest-posttest control group design. This study was carried out by holding two groups of Class X Sciences 1 as the experimental group (n = 31) and Class X Sciences2 as the control group (n = 32). Testing of learning achievement data of students used t-test statistical analysis of two parties with the prerequisite tests: normality and homogeneity tests of written test given after learning (posttest). Results of the data analysis showed the average value (i) of the experimental class was 56.48 with a standard deviation of 11.07, and (ii) of the control class was 46.25 with a standard deviation of 11.98. Based on the hypothesis test results with t-test statistical of two parties obtained -ttable ≤ tcountt≥ + ttable (tcount = 2.43 and ttable= 1.67) with a significance level of α = 0.05 and degrees of freedom of 61, then H0 is rejected and Ha is accepted. Results of the data analysis of students motivation by using descriptive statistical analysis from the questionnaire of students motivation showed that the experimental class was currently on attitudes agree with the positive category of 82.58%, and the control class was on attitudes agree with the positive category of 83.78%.It can be concluded that there was an effect of guided inquiry learning model with mind map toward learning achievement of students, but it had no effect on the motivation of students in Class X at SMA 5 Palu on Reduction-Oxidation.
Penerapan Pendekatan Contextual Teaching And Learning (CTL) Pada Materi Larutan Penyangga Kelas XI IPA 1 SMA Negeri 1 Poso Pesisir Utara Riyadi, Bayu; Hamzah, Baharuddin; Sakung, Jamaluddin
Jurnal Akademika Kimia Vol 4, No 1 (2015)
Publisher : Universitas Tadulako

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Abstract

The use of learning approach applied to the study of chemistry is still one-way, the student just as a listener and not actively involved in the learning process. This research aims to determine the learning outcomes to the students who take buffer to the grade XI IPA I SMAN 1 Poso Pesisir Utara with contextual teaching and learning approach was better than the grade that follows the learning without contextual teaching and learning approach. The research population was all students of class XI IPA I SMAN 1 Poso Pesisir Utara in academic year 2013-2014 amounted to 65 studets were distributed in to classes. The research sample was determined by purposive sampling, 33 class XI IPA I as the experimental class and 32 class XI IPA 2 as control class. The data collection using test instruments in the form of 18 multiple-choice items that had been tested for validity and reliability. chemistry achievement of buffer test material, research data testing use t-test statistical p-analysis of the parties to the prerequisite test, test for normality and homogeneity tests. The analysis statistical hypothesis t-test was obtained value of tcalculate = 2.41 and ttable value = 1.67 this implies rejection of Ho. It can be concluded that the approach contextual teaching and learning effect on learning outcomes of students of the grade XI IPA I at SMAN 1 Poso Pesisir Utara in the material buffer with a good score than the conventional learning.
EKSTRAK BUNGA WARU (Hibiscus tiliaceus) SEBAGAI INDIKATOR ASAM-BASA Frantauansyah, Frantauansyah; Nuryanti, Siti; Hamzah, Baharuddin
Jurnal Akademika Kimia Vol 2, No 1 (2013)
Publisher : Universitas Tadulako

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Abstract

Hibiscus tiliaceus is a tribe or cottons malvacea, it is known as sea hibiscus. This plant has been known for a long time ago. It is known as a shade tree in the curb or in the edge of the river and as the embankment along the coast. Although, the canopy is not too dense, it is preferred because its roots are not deep into the soil. So, it does not damage the roads and buildings. This study of hibiscus flower extract has been done. It proved that there was indicator acid-base. Hibiscus flower washed with distilled water, cut into small piece, then add dissolved acetate ethyl and macerated. After that, filtered and residue re-extracted filtering results with absolute ethanol. Extract filtered by using gauze filter, then filtered it again with paper filter paper. The filtrate is ready to use as as acid-base indicator. After that, evaluated with benchmark indicators phenolphthalein and orange methyl to titrate acid-base such as: a strong base with a strong acid, a weak base with a strong acid and a strong base with a weak acid. The result of survey revealed that the indicator of hibiscus flower extracts indicate the equivalence point in the titration result equivalent to the comparison indicator. The result showed the indicator of the hibiscus flower extract can as a substitute to synthetic indicator (phenolphthalein and orange methyl) has been used.
Ekstraksi Ubi Jalar Ungu (Ipomoea batatas L.) Menggunakan Variasi Pelarut Serta Pemanfaatannya Sebagai Indikator Asam-Basa Afandy, Moh. Azhar; Nuryanti, Siti; Diah, Anang Wahid M.
Jurnal Akademika Kimia Vol 6, No 2 (2017)
Publisher : Universitas Tadulako

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Abstract

Purple sweet potato (ipomoea batatas L.) is one source of carbohydrate. Purple sweet potato contains vitamins and minerals that needed by humans such as vitamin A, vitamin C, calcium, and iron. The sweet potato with purple flesh is widely used as natural dyes which are called anthocyanins. The study aim was to determine a suitable solvent to extract the purple sweet potato. Variation of solvent used namely methanol, methanol acidified with HCl 1% and solvent fractionation (n-hexane, ethyl acetate, and methanol). The extraction phase was divided into two, for flesh and for the skin of the purple sweet potato. The extraction results were then compared with phenolphthalein indicator and a methyl orange on acid-base titration. The results showed that the methanol acidified with HCl 1% provided a more stable color changes in acid-base testing, and the testing of phosphate buffer pH 1-12. Purple sweet potato extracts can be used as an acid-base indicator because it gave similar results with comparative indicators, phenolphthalein, and methyl orange.
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.
Uji Aktivitas Anti Jamur Ekstrak Kayu Manis (Cinnamomum burmanii Blume) Terhadap Jamur Candida Albicans Nuryanti, Siti; Jura, Minarni Rama; Nursucianti, Nursucianti
Jurnal Akademika Kimia Vol 4, No 3 (2015)
Publisher : Universitas Tadulako

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Abstract

Cinnamon contains essential oils those can act as anti-fungal. This study aims to determine the inhibition of fungal growth of cinnamon extract against candida albicans. The study was conducted using a sample of cinnamon extract in some solvents those were distilled water, ethanol, and hexane, and the suspension of the fungus candida albicans which has been synchronized with the MC.Farland standard solution, and performed with pitting method. The results showed that the inhibition of cinnamon extract in hexane against candida albicans fungus was greater than in distilled water and ethanol. Hexane was the most dominant solvent to extract oil contained in cinnamon and some seeds, and also easy to evaporate and separate to produce more essential oils. Based on the observations the percentage of fungal inhibition of cinnamon extracts in distilled water, ethanol, and hexane solvents were, 3.19%, 0% and 100%, respectively.
PERBANDINGAN PENERAPAN METODE PEMBELAJARAN ROLE PLAYING DENGAN PEMBELAJARAN KONVENSIONAL TERHADAP HASIL BELAJAR KIMIA SISWA SMA NEGERI 1 LORE UTARA Masrita, Masrita; Gonggo, Siang Tandi; Sabang, Sri Mulyani
Jurnal Akademika Kimia Vol 2, No 1 (2013)
Publisher : Universitas Tadulako

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Abstract

Research dealing with role-play Learning and conventional learning methods, have been conducted. The main reason for this research was that chemical bond was one of the difficult but fundamental materials to be mastered by the students at grade X. The purpose of this research was to investigate the students’ achievement on the topic of chemical bond at SMA Negeri 1 North Lore. One way of increasing their achievement was by using role-play method. In order to make their learning understandable, not boring, and easy to grasp, the researcher applied an interesting method called role-play. The population of this research was the tenth grade students of SMA Negeri 1 North Lore in the academic year 2012/2013. The sample was 32 students of grade XA as the experimental group (role-play) and 32 students of grade XC as the control group (conventional learning). The data were collected through the test on chemical bond. Based on the analysis, it is found that the average score of the experimental group was 20.65 with deviation standard of 2.413 and of the control group was 15.06 with deviation standard of 2.975. The hypothesis testing was that the t-counted value was 12.75 and the t-table value was 1.67 with the significant value (α) of 0.05. The results showed that there was a significant difference in the students’ achievement dealing with the topic of chemical bond through the application of role-play learning method and conventional learning method at grade X at SMA Negeri 1 North Lore in the Academic Year 2012/2013.
Pengaruh Ekstrak Tanaman Putri Malu (Mimosa pudica Linn) Terhadap Penurunan Kadar Glukosa Darah Pada Mencit (Mus musculus) Mustapa, Kasmudin; Rizky, Amalia; Jura, Minarni Rama
Jurnal Akademika Kimia Vol 6, No 1 (2017)
Publisher : Universitas Tadulako

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Abstract

The research aim is to determine the effect of mimosa plant (mimosa pudica Linn) to reduce blood sugar levels in mice and determining the effective concentration of mimosa plant extracts as an alternative to decrease blood sugar levels. The extract is produced by the infusion method. The animal test used is male mice with amount 18 mice that induced by EDTA (ethylene diamine tetraacetic acid). Mice are divided into 6 groups randomly with different treatment. The group I, II, III and IV were given the mimosa plant extract with a concentration of 10, 20, 30, and 40% (w/v) respectively while group V is given glibenclamide suspension as positive control (+) and group VI is given Na-CMC 1% as negative control (-). Data were analyzed using the statistical test analysis of variance (ANOVA) and then followed by Duncan test. The results showed that the mimosa plant extract contains flavonoids, alkaloids, and tannins. In preclinical testing of mimosa plant extract proven to reduce blood sugar levels in mice and the most effective concentration is a concentration of 20% (w/v) with significantly α = 0.05.
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.
ANALISIS LOGAM TEMBAGA (Cu) PADA BUANGAN LIMBAH TROMOL (TAILING) PERTAMBANGAN POBOYA Nuriadi, Nuriadi; Napitupulu, Mery; Rahman, Nurdin
Jurnal Akademika Kimia Vol 2, No 2 (2013)
Publisher : Universitas Tadulako

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Abstract

The analyses of Copper (Cu) has been performed in the sample of drum waste (tailings) gold mining in Poboya by using Atomic Absorption Spectrophotometry (AAS) method.The alkaline destruction by the addition of HNO3 and HClO4 has been done by heating then distilled. The absorbance was measured at a wavelength (λ) = 324.7 nm on copper metal analysis. From the analysis,it was obtained copper metal in each drum consist of as follows drum A. 204.92 mg/kg, drum B 151.85 mg/kg, drum C 79.51 mg/kg, drum D 167.78 mg/kg, drum E 190.68 mg/kg, with the overall average value of 158.94 mg/kg. The data shown that the area gold mining at Poboya contain copper metal ion in high quantity.

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