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Jurnal Akademika Kimia
Published by Universitas Tadulako
ISSN : 24775185     EISSN : 23026030     DOI : -
Core Subject : Science, Education,
Chemistry Education
Jurnal Akademika Kimia is an electronic open-access journal that aims to publish the latest research results in the area of chemistry education and pure chemistry from academicians, professionals, and other practitioners at all levels of chemistry education. The journal coverage includes the following: current trends of professional chemistry education, educational technology, teacher education, educational science, learning assessment, learning models and development of learning materials, as well as pure chemistry including organic chemistry, inorganic chemistry, analytical chemistry, physical chemistry, biochemistry and other chemistry fields such as environmental chemistry, that emphasis on a broad description of the general methods and processes for the synthesis, modification, and characterization of chemical materials.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 8 Documents
 1 
Search results for , issue "Vol. 8 No. 3 (2019)" : 8 Documents clear
Antioxidant Activity Tests of Extract of Principle Crafts (Phaleria macrocarpa) Tri Putri; Anang W. M. Diah; Afadil Afadil
Jurnal Akademika Kimia Vol. 8 No. 3 (2019)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2019.v8.i3.pp125-129

Abstract

Phaleria macrocarpa contains secondary metabolite compounds such as alkaloids, terpenoids, saponins, polyphenols, tannins, sterols, and coumarins. Those metabolites are antioxidants and can be efficacious in the healing of various degenerative diseases such as cervical cancer and diabetes. This plant is widely grown in Tindaki Village, Parigi Mautong, Central Sulawesi. The aim of this study was to determine the antioxidant power of those phaleria macrocarpa fruit extract. This study was conducted by using maceration extraction technique with ethanol as solvent, and compound 2,2-difenil-1-picrilhidrazil (DPPH) as source of free radical, and vitamin C as the positive control. The UV-Vis spectrophotometer was used to measure the absorbance of the extract. Various concentrations of the extract used were 5 ppm, 15 ppm, 25 ppm, and 35 ppm. The results showed that the IC50 value of the fruit extract was 28.242 ppm, while the IC50 value of vitamin C was 19.302 ppm. These IC50 values show that vitamin C was a stronger antioxidant activity than the fruit extract, but the fruit extract was still as a very strong natural antioxidant category.
Differences in Learning Outcomes of Chemistry through Cooperative Learning Model Type Make a Match and Numbered Head Together on the Material of Electrolyte and Nonelectrolyte Solution of Students Class X in SMA Negeri 9 Palu Nur Qamariya; Minarni R. Jura; Afadil Afadil
Jurnal Akademika Kimia Vol. 8 No. 3 (2019)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2019.v8.i3.pp135-140

Abstract

Application of learning model is expected to build good communication between students with teachers and students with students in an effort to improve understanding of a concept. This study aimed to determine the differences in the learning outcomes of chemistry through cooperative learning model type make a match and numbered head together in the material of electrolyte and nonelectrolyte solution of students class X SMA Negeri 9 Palu. This type of research was pre-experimental with the static group pretest-posttest design. The sample used in this research was the students of class Xa (n = 23) as the first experiment 1 and students of class Xb (n = 23) as the second experiment 2 with. The result of data analysis obtained, the mean value of the experiment class 1 was 74.24 and in the experiment class 2 was 67.28. The result of hypothesis testing with t-test statistic on two side was obtained - ttable ≤ tcount ³ + ttable that was (-1.68 <3.27> +1.68 with significant level (α = 0.05) and degrees of freedom = 44. This indicates that H0 was rejected and Ha was accepted so that it can be concluded that there are differences in the students’ learning outcomes of chemistry through cooperative learning model type make a match and numbered head together in the material of electrolyte and nonelectrolyte solution of class X SMA Negeri 9 Palu.
Application of Cooperative Learning Model Type Teams Games Tournament (TGT) with Demonstration Based to Improve the Learning Outcomes of Colloid Topic in Student Class XI SMA Negeri 7 Palu Nur Intan; Minarni R. Jura; Ijirana Ijirana
Jurnal Akademika Kimia Vol. 8 No. 3 (2019)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2019.v8.i3.pp141-146

Abstract

This study aimed to obtain a description of implementation on student’s learning outcomes the application of cooperative learning model of TGT based on demonstration Class XI on colloid material in SMA Negeri 7 Palu. The type of research used in this research was pre-experimental designs (non-designs) with research design that was one-group pre-test post-test design. Sampling in this study was chosen by purposive sampling. The sample consisted of two classes, class XI IPA 1 as experimental class 1 (n = 28) and class XI IPA 2 as experiment class 2 (n = 29). Student learning outcomes were processed using inferential statistical analysis of the Wilcoxon Rank-Unparpulated Ranking nonparametric test. The results showed that the experimental class 1 was Zcount (-4.62) <Ztable (-1.96) and experiment 2 was Zcount (-4.70) <Ztable (-1.96). The effectiveness of the implementation of learning model of TGT based on demonstration to words student learning outcomes can also be seen from the assessment of student learning outcomes with the average posttest score for experimental class 1 was 83.29 and experiment class 2 was 80.86 with the result of N-gain calculation for both experiment class included in high category that was equal to 0.83 and 0.85. So it can be concluded that the implementation of learning model of TGT based on demonstration can improve student learning outcomes with average greater than 75 on colloid material in SMA 7 Palu.
Analysis of Vitamin C and Calcium in Jongi Fruits (Dillenia serrata Thunb) Based on Their Maturity Level Miryam B. Kalase; Daud K. Walanda; Mery Napitupulu
Jurnal Akademika Kimia Vol. 8 No. 3 (2019)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2019.v8.i3.pp147-152

Abstract

Jongi plant (Dillenia serrata Thunb) is one of the plants that found  Poso District. The characteristics of this fruit are mainly on the refreshing sour taste and attractive color which is yellow. This study aims to determine the levels of vitamin C and calcium in this fruit based on the level of maturity. The fruit of jongi used as a sample was categorized into there type of maturity namely mature, ripe, and overripe. The method used for vitamin C analysis was iodimetry and for calcium, analysis using spectrophotometry (λ: 422.7 nm). From the results of the analysis, it was obtained that the levels of vitamin C in fruit jongi successively were 81.84, 114.40, and 70.40 mg/100 g, while the calcium levels obtained in the fruits were 5.91, 5.65, and 6.46 mg/100 g. The data above showed that the maximum vitamin C content in jongi fruit when the fruit was in ripe type, while the highest calcium content in jongi fruit was when the fruit in overripe type.
Antioxidant Activity Test of Red Spinach’s Extract (Blitum rubrum) in Ethanol Solvent and Water Solvent with DPPH Nur A. O. Buhang; Siti Nuryanti; Daud K. Walanda
Jurnal Akademika Kimia Vol. 8 No. 3 (2019)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2019.v8.i3.pp153-159

Abstract

The study of red spinach antioxidants (Blitum rubrum) in two types of solvents i.e ethanol and water has been performed. The purpose of this study was to determine the antioxidant activity of red spinach extract from Tinombo Selatan district, Central Sulawesi. Red spinach was macerated in ethanol and water to obtain variations of extract concentrations of 20, 40, 60, and 80 mg/L. Free radicals used were DPPH reagents while vitamin C was used as a positive control. The measurement of absorbance of red spinach’s extract was conducted by spectrophotometric. The results showed that IC50 extract of red spinach in ethanol and water were 51.404 mg/L and 52.227 mg/L, while the value of IC50 vitamin C in ethanol and water solvent was 43.241 mg/L and 140.507 mg/L. Based on the IC50 red spinach’s extract in ethanol and water have strong antioxidant activity.
The Implementation of Blended Learning Based on MOODLE on Student’s Chemistry Learning Outcome at Class X in SMA Negeri 3 Poso Wayan A. K. Mahardika; Vanny M. A. Tiwow; Suherman Suherman
Jurnal Akademika Kimia Vol. 8 No. 3 (2019)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2019.v8.i3.pp176-172

Abstract

The growth of technology has encouraged learning toward blended learning which combines e-learning-based learning with the conventional face-to-face learning system. The use of MOODLE software to created web-based virtual class and the benefits of social interaction, making blended learning to has a more flexible and efficient time with more varied learning media. This research aimed to determine the effect of the implementation of blended learning based on MOODLE on student chemistry learning outcomes at class X in SMA Negeri 3 Poso. The research was conducted by giving treatment to the experiment class 1 (n = 32) and repeating the same treatment to the experiment class 2 (n = 33). The average pretest value in experiment class 1 was 19.06 and in experiment class 2 was 20.30. While the average of posttest value in experiment class 1 was 76.50 and in experiment class 2 was 73.00. The test of hypotheses was conducted using the Wilcoxon Signed Rank Test with criteria is, if –Ztable ≤ Zcalculate ≤ +Ztable then H0 is accepted. The value of Zcalculate in experiment class 1 was -4.93 and in experiment class 2 was -5.01. Based on the data, it been concluded that there was an effect of the implementation of blended learning based on MOODLE on student’s chemistry learning outcomes at class X in SMA Negeri 3 Poso.
The Differences in Chemistry Learning Outcomes using Cooperative Learning Model Type Numbered Head Together with Think Pair Share on the Material of Atomic Structure and Periodic Table in Class XI SMAN 9 Yunita Rosida; Sri M. Sabang; Minarni R. Jura
Jurnal Akademika Kimia Vol. 8 No. 3 (2019)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2019.v8.i3.pp173-179

Abstract

This study aimed to determine the differences in the chemistry learning outcomes using cooperative learning model type Numbered Head Together with Think-Pair-Share on the material of atomic structure and periodic table in class XI SMAN 9 Palu. This type of research was a quasi-experimental research with the nonrandomized pretest-posttest design. The population in this research was 44 students of class XI IPA in SMA Negeri 9 Palu who registered in the academic year 2017/2018.  The sampling technique used was saturated sampling. The sample in this study were 22 students of class XI IPA 1 as experimental class 1 and 22 students of class XI IPA 2 as experimental class 2. The data of the research were analyzed using a one-party t-test statistic with the prerequisite test, normality test, and homogeneity. The result of data analysis obtained,  X̅1 value of chemistry learning on the students of experimental class 1 was 79.86 (SD = 7.15) whereas in the experimental class 2 students X̅2 value was 73.95 (SD = 8.26). The result of hypothesis testing was obtained t > t1 – α was 2,55 > 1.68 with a significant level (α = 0.05) and degrees of freedom = 42. This showed that Ho was rejected and Ha was accepted so that it can be concluded that there were differences in the results of chemistry learning outcomes using cooperative learning model type Numbered Head Together with Think-Pair-Share on the material of the atomic structure and the periodic table.
Analysis of Cyanide Acid Content in Cassava (Manihot esculenta) Based on Storage Time Ria Lumbantobing; Mery Napitupulu; Minarni R. Jura
Jurnal Akademika Kimia Vol. 8 No. 3 (2019)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2019.v8.i3.pp180-183

Abstract

Cassava is a tuber of cassava plants which is a source of carbohydrates that can be consumed as food and as snack foods such as chips. However, cassava and the leaves contain cyanide acid (HCN) which is dangerous for the human when consumed in excess. Cyanide acid reduction can be done by washing as well as immersion because of its volatile nature. The aim of this research is to investigate the difference of cyanide acid (HCN) content on peeled and unpeeled cassava with the variation of storage time 0, 2, 4, 6, and 8 days. A preliminary test was done to know the existence of cyanide acid (HCN) in cassava. Method analysis of cassava was titrated with the NH4CNS solution using the argentometric principle of the Volhard method. The results showed that cyanide acid (HCN) content in peeled cassava was higher than unpeeled cassava which was 3.9, 4.7, 5.2, 5.6, and 6.0% respectively for shelled cassava and 3.9, 4.6, 5.1, 5.5, and 5.9% respectively for unpeeled cassava.

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