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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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Penerapan Model Pembelajaran Problem Based Learning (PBL) terhadap Hasil Belajar Siswa SMAN 7 Palu Kelas XI pada Materi Larutan Penyangga Beddu, Amsar T.; Sabang, Sri Mulyani; Ningsih, Purnama
Jurnal Akademika Kimia Vol 7, No 1 (2018)
Publisher : Universitas Tadulako

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Abstract

This research aims to investigate the result of a study in applying the model of problem-based learning (PBL) the students of SMAN 7 Palu on the topic buffer. This method use quasy experiment with pretest-posttest control group design. The population is a class XI students of SMAN 7 Palu, where the sample is a 23 students in class XI IPA 3 as the experimental group and 23 students in class XI IPA 4 as the control group, which is determined by purposive sampling. The result of student learning to the average value of the experimental class is bigger than for class control experiment was 82.61 and for the control, class is 8.65. Test normality using the Kolmogorov-Smirnov test values obtained for the experimental class Sig 0.20 > 0.05 and class control 0.20 > 0.05, it means that both at data are normally distributed. Homogeneity test using the test statistics Lavene which gained value of Fhitung 0.37 > 0.54 Ftabel for experimental classes.200 Sig > 0.05 and for grade control 0.20 > 0.05, it means that both of normally distributed data, there is similarities variant between a group or the means homogeneous. Testing hypothesis use t-test two parties where the significance value of 0.06, it means at the value of Sig > 0.05, that Ho rejected and Ha accepted. Based on the statistical test, PBL learning model on material buffer has a positive influence on results for students at SMAN 7 Palu
Pemanfaatan Biji Kelor (Moringa oleifera L.) Sebagai Pasta Gigi Ma’ruf, Ahmad; Supriadi, Supriadi; Nuryanti, Siti
Jurnal Akademika Kimia Vol 5, No 2 (2016)
Publisher : Universitas Tadulako

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Abstract

Moringa seed (moringa oleifera L.) is a kind foodstuffs that contains calcium. Calcium is a mineral that is needed by our bodies in all ages, for the infants to the elderly. Calcium is useful in the formation and maintenance of bones and teeth. The aim of this study is to determine the concentration calcium (Ca) in moringa seed (moringa oleifera L.) and its utilization as the fabrication of toothpaste. The method used in this study was a laboratory experiment using a flame photometer. The results showed that the concentration of calcium in moringa seeds with three repetitions was 131.67 ± 12.58 mg/100g. The appropriate composition of materials to make toothpaste from moringa seeds including the roughness tests of toothpaste and based on the fondness of panelists was 25:5 (morinanga seed:NaHCO3). Furthermore, the test of freshness, aroma, and colour with comparison of glycerin, mint leaves, betel leaves and food coloring 7.5: 5: 5: 2.
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.
Analisis Kadar Flavonoid pada Batang Jarak Pagar (Jatropha curcas L.), Jarak Merah (Jatropha gossypifolia L.), dan Jarak Kepyar (Ricinus communis L.) Kesumasari, Ni Made; Napitupulu, Mery; Jura, Minarni Rama
Jurnal Akademika Kimia Vol 7, No 1 (2018)
Publisher : Universitas Tadulako

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Abstract

This study aimed to determine flavonoids levels contained in each of jatropha plant samples to be used as an alternative affordable free radicals deterrent. The flavonoid content was analyzed using UV-Vis spectrophotometry. Stem of the three samples was extracted using HCl. The results showed that total flavonoids levels contained in each stem of Jatropha curcas L., Jatropha gossypifolia L., and Ricinus communis L. were 3.959 mg/L, 1.309 mg/L, and 0.083 mg/L, respectively.
Pengaruh Ion Logam Cd(II) Terhadap Ekstraksi Ion Timbal(II) Menggunakan Teknik Emulsi Membran Cair Rizka Setyani; Baharuddin Hamzah; Suherman Suherman
Jurnal Akademika Kimia Vol 5, No 2 (2016)
Publisher : Universitas Tadulako

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Abstract

This study aims to study on the effect the addition of Cd (II) metal ions towards extraction of lead (II) ions using liquid emulsion membrane technique. Various concentrations of Cd (II) ions used in this study were 0, 50, 100, 150, 200, and 250 ppm. Benzoyl acetone was used as a chelating agent for extraction. Spectrophotometer spectrodirect was used to measure extraction products. The results showed that percent extraction of lead (II) ion prior additional Cd(II) ion was 99.06%, and it was decreased up to 97.95% after additional Cd(II) ion up to 250 ppm.
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.
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.
Pemanfaatan Ampas Tahu Sebagai Bahan Baku Pembuatan Biodiesel Trisnawati, Trisnawati; Walanda, Daud K.; Said, Irwan
Jurnal Akademika Kimia Vol 5, No 3 (2016)
Publisher : Universitas Tadulako

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Abstract

Biodiesel is an alternative raw material for fuel of diesel motor made from vegetable oil. This study attempted to utilize tofu dregs as raw material for biodiesel. This study aimed to determine the yield of biodiesel produced and the content of methyl esters in the biodiesel yield, and to analyze the quality of biodiesel produced based on Indonesian national standard (SNI). This study consisted of four stages: the provision of samples, pre-treatment, esterification and transesterification, and analysis of the quality of biodiesel produced which include the density at 15 °C, the viscosity at 40 °C, and the moisture content. The results showed that the yield of biodiesel was 4.01%, and the content of methyl ester shown by larger Rf (0.87) using eluent of hexane:diethylether:formic acid. Results of the analysis of biodiesel quality obtained the density at 15°C was 864 kg/m3, the viscosity at 40 °C was 2.57 mm2/s, and the water content was 4%. Based on the parameters ofthe density at 15 °C and the viscosity at 40 °C, the product of biodiesel met the requirements of SNI, while in term of the water content the product did not meet the requirements of SNI.
Pemanfaatan Biomassa Kulit Batang Jambu Biji (Psidium Guajava L.) untuk Adsorpsi Logam Besi Purba, Lerois; Pursitasari, Indarini Dwi; Said, Irwan
Jurnal Akademika Kimia Vol 4, No 1 (2015)
Publisher : Universitas Tadulako

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Abstract

Guava’s bark contains tannin compound that can be used as an adsorbent. The purpose of thisstudy was to determine the optimum conditions of the adsorption of iron by the bark and its maximumabsorption capacity. The study was conducted by mass variation of bark for iron metal adsorption.The measurement of iron concentration which was not absorbed by the bark was conducted byatomic absorption spectrophotometer. The results showed that the adsorbent mass of 2.5 grams canabsorb 1.93mg/g with percent absorbance of 48.34%, and the maximum absorption capacity of ironlost at 4.98mg/g.
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.

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