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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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The Differences on Students’ Learning Outcomes in Grade X at SMA Negeri 1 Parigi Through the Number Head Together (NHT) Learning Strategies and Discussion on the Topic of Redox Reaction H.J, Nur Rahmadana Safitri; Diah, Anang Wahid M; Afadil, Afadil
Jurnal Akademika Kimia Vol 8, No 2 (2019)
Publisher : Universitas Tadulako

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Abstract

This study aimed to determine the differences in students’ learning outcomes in  grade X at SMA Negeri 1 Parigi through of number head together (NHT) strategies and  discussion on the topic of Redox Reaction. Type of this study was a quasi experiment with posttest-only control group design. This study was conducted in two groups namely Class X MIPA A as the experimental group (n = 35) and Class X MIPA B as the control group (n = 37). The students’ learning outcomes data were tested by using non-parametric statistical analysis Mann-Whitney U-test. The result showed that for the mean value of the experimental class was bigger than the control class that was 44.24 ˃ 29.18. The result of statistical analysis obtained Sig. 2-tailed (0.002) ˂ 0.05 and Zaccount (-3.069) ˂ Ztable (-1.96). The average score of the experimental class was 64.52 while the control class was 62. It can be concluded that there is a difference on students’ learning outcomes in grade X at SMA Negeri 1 Parigi through of NHT strategies and  discussion method on the topic of redox reaction.
The Influence of Contextual Teaching and Learning (CTL) Model on Learning Outcomes in Colloid System Material at Class XI Madrasah Aliyah Negeri 2 Model Nurhayati, Fitri; Mustapa, Kasmudin; Jura, Minarni Rama
Jurnal Akademika Kimia Vol 8, No 1 (2019)
Publisher : Universitas Tadulako

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Abstract

This study aimed to determine students’ learning outcomes in Grade X at MA Yayasan Islam Indonesia Pulau Sebatik by applying cooperative learning model-Jigsaw type on the hydrocarbons material. This type of study was a quasi-experimental research with non-randomized pretest-posttest control group design. The population in this study was students of class X MA YIIPS academic year 2014/2015 which amounted of 42 students and consisted of 2 classes. The sample in this study was class XA MA YIIPS (n = 22) as the experiment class and class XB MA YIPS (n = 22) as the control class. The result of data analysis in the experiment class obtained X̅1 value of 78.81 with a standard deviation of 10.41, and in the control class obtained X̅2 value was 70.72 with a standard deviation of 11.55. The result of hypothesis test was tcount > ttable (8.17 > 1.67) with significant level (α) of 0.05 and degree of freedom of 42. This result indicated that H0 was rejected and H1 was accepted, so it can be concluded that the students’ learning outcomes of chemistry on the hydrocarbons material treated with cooperative learning model-Jigsaw type is better than untreated class.
Uji Aktivitas Antioksidan Ekstrak Buah Semangka (Citrullus lanatus) Mariani, Sri; Rahman, Nurdin; Supriadi, Supriadi
Jurnal Akademika Kimia Vol 7, No 3 (2018)
Publisher : Universitas Tadulako

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Abstract

The aim of this study is to determine the IC50 extracts values of white peel and flesh of red watermelon, white peel and flesh of yellow watermelon as antioxidants. To determine antioxidant activities DPPH reagent was used and UV-Vis spectrophotometry was used to measure Vitamin C as a positive control measurement. The samples mixed with ethanol in a various concentration of 5, 15, 25 and 35 mg/L. The results showed that the IC50 values for each extract of red watermelon flesh, yellow watermelon flesh, white peel of red watermelon, and white peel of yellow watermelon were 16.619, 16.575, 14.729, and 16.782 mg/L, respectively. Vitamin C as positive control has an IC50 value of 9.526 mg/L. These IC50 values showed that vitamin C had higher antioxidant activity than watermelon extracts, but the extracts of watermelon still categorized in strong natural antioxidants. This study concluded that watermelon is good to be consumed because it is a very strong antioxidant.
Pengaruh Model Pembelajaran Kooperatif Tipe Teams Games Tournaments dan Tipe Scramble Terhadap Motivasi dan Hasil Belajar Siswa Kelas XI IPA pada Materi Larutan Asam-Basa di SMAN 1 Bunta Latupeirisa, Veronica Purnama Sari; Nuryanti, Siti; Mustapa, Kasmudin
Jurnal Akademika Kimia Vol 7, No 3 (2018)
Publisher : Universitas Tadulako

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Abstract

This study aimed to determine the effect of cooperative learning model teams games tournaments and scramble towards the student's motivation and learning outcomes of class XI IPA on the material of acid-base solutions in SMAN 1 Bunta. This research was a pre-experimental with the static pretest-posttest group design. The samples used in the study were students XI IPA 2 (n=30) as a class experiment 1 and students XI IPA 3 (n=28) as an experiment 2. The results of data analysis, the average value of class experiment 1 () was 78.2 and the experimental class 2 () was 73.21. Results of hypotheses testing by statistical t-test two parties it was obtained -ttable ≤tcal≥ + ttable  (tcal = 36.72 for class experiment 1; tcal = 24.65 for class experiment 2  and ttable = 1.67) with a significance level a = 0.05 and degrees of freedom 56, then H0 was rejected and Ha was accepted. The results of the students learning motivation questionnaire showed that the experimental class 1 was the attitude of "strong agree" with the positive category 85.12% and the experimental class 2 was in the attitude of "agree" with the positive category 84.17%. It can be concluded that there is an influence of cooperative learning model teams games tournaments and scramble to the student's motivation and learning outcomes of class XI IPA on the material of acid-base solutions in SMAN 1 Bunta.
Analisis Kadar Vitamin C, Kalsium dan Posforus pada Cabai Rawit (Capsicum frustescens L.) Hasil Pengawetan Nurjannah, Ida; Sabang, Sri Mulyani; Afadil, Afadil
Jurnal Akademika Kimia Vol 7, No 4 (2018)
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Abstract

This study aimed to determine the levels of vitamin C, calcium and phosphorus of the preserved chili pepper. In this research, two preservation techniques were applied, cooling and drying. For analysis of vitamin C was used the iodometric method, the results obtained in the technique of cooling was 11.08 mg/100 g and the drying technique was 9.85 mg/100g. For calcium and phosphorus analysis was analyzed by using the spectrodirect instrument, research result obtained for calcium in the cooling technique was 20.00 mg/L and the drying technique was 12.33 mg/L while for phosphorus of the cooling technique was 27.66 mg/L and the drying technique was 55.16 mg/L.
Pengaruh Konsentrasi Surfaktan Campuran (Span 80 dan Span 20) dan Rasio Volume Emulsi/Fasa Eksternal terhadap Ekstraksi Ion Kadmium (Cd) Menggunakan Teknik Emulsi Membran Cair Amin, Alif Hidayatullah; Hamzah, Baharuddin; Ningsih, Purnama
Jurnal Akademika Kimia Vol 7, No 4 (2018)
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Abstract

Research on the extraction of cadmium(II) ion has been performed using the emulsion liquid membrane technique. This research used laboratory experimental method using benzoyl acetone as a carrier, kerosene as a membrane, nitric acid solution as an internal phase, span 80 and span 20 as a surfactant, and cadmium(II) solution as a sample. The present study was conducted to determine the optimum conditions of cadmium(II) ion extraction in solutions comprising variations in surfactant concentration of spans 80 and span 20 mixtures (1.5–3.5%) and variations in the ratio of emulsion/external phase (1:5–1:7). Determination of remaining of cadmium(II) ion concentration in the sample was analyzed using UV-Vis spectrophotometer at 519 nm wavelength. The results showed that the concentration of mixed surfactants (span 80 and span 20) which resulted in a maximum percent of extraction was 2.5% with 60.11% extraction percentage. In addition, the volume ratio of the emulsion/external phase gave a maximum extraction percentage at a ratio of 1:5.5 with an extraction percent of 78.03%.
Fabrication of Charcoal from Jackfruit’s Peel (Artocarpus heterophyllus) as Adsorbent on Dissolved Cadmium and Nickel Baloga, Hendra; Walanda, Daud K; Hamzah, Baharuddin
Jurnal Akademika Kimia Vol 8, No 1 (2019)
Publisher : Universitas Tadulako

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Abstract

Jackfruit’s peel contains lignocellulosic compounds that potential for fabrication of charcoal and useful for adsorbing heavy metals. Based on this, then it was conducted a study on the utilization of charcoal from jackfruit’s peel to be used as adsorbent on cadmium and nickel. The analysis process of this research was conducted by using atomic absorption spectrophotometry (SSA). The results showed that charcoal’s characteristics from jackfruit’s peel contained of 4.4% water, 9.3% ash, and biomass content that can be used as an absorbent was 86.3%. The optimum adsorption of charcoal from jackfruit’s peel for cadmium ion was contact time of 120 minutes, pH 7 and concentration of 40 mg/L with the percentages of penetration respectively were 84.65%, 99.10%, and 99.43%. On the other hand, for nickel was 150 minutes of contact time, pH 5, and concentration of 20 mg/L with percentage of penetration were 87.95%, 91.75%, and 75.15% respectively.
The Difference of Students’ Learning Outcomes through the Implementation of Cooperative Learning Model Two Stay Two Stray type based Concept Maps with Problem Based Learning at MAN 2 Palu Kokou, Rizka Kurniawati; Said, Irwan; Mustapa, Kasmudin
Jurnal Akademika Kimia Vol 8, No 2 (2019)
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Abstract

This study was conducted to determine the difference of students’ learning outcomes through the implementation of cooperative learning model two stay two stray type based concept maps with problem based learning at MAN 2 Palu. This study is pre experimental research with static group pre-test post test design. The population was all students of class X MIA at MAN 2 Palu registered in the academic year 2016/2017 as many as 6 classes with a total of 156 students. The sampling technique was purposive sampling. The sample in the experimental class 1 was as much as 27 students, and in the experiment class 2 was as much as 29 students. Data of students’ learning outcomes were tested using mean value, N-gain, and Mann-Whitney U-Test. The results of data analysis showed that the mean value ( ) of students in the experimental class 1 was 83.70, and the mean value ( ) of the experimental class 2 was 76.0. The N-gain value in the experimental class 1 obtained the high criteria gain index of 70.37%, the medium criteria gain index of 25.92%, and the low criteria gain index of 3.70%, while in the experimental class 2 obtained the high criteria gain index of 34.48%, the medium criteria gain index of 58.62%, and the low criteria gain index of 6.89%. The Mann-Whitney U-Test obtained Sig. 2-tailed (0.028) <0.05 and Zaccount (-2.200) < Ztable (-1.96), then H0 is rejected and Ha accepted. It can be concluded that there is a difference in students’ learning outcomes through the implementation of cooperative learning model type two stay two stray based concept maps with problem based learning at MAN 2 Palu.
Analysis of Pectin Levels in Banana Kepok (Musa paradisiaca) and Banana Raja (Musa sapientum) Timang, Selfiana Imu; Sabang, Sri Mulyani; Ratman, Ratman
Jurnal Akademika Kimia Vol 8, No 2 (2019)
Publisher : Universitas Tadulako

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Abstract

Banana is a type of fruit that is relative widely consumed by community, either directly consumed or processed into other foods such as fried bananas and chips, while the peelsare usually thrown as waste. Banana peel is one source of pectin. Pectin is a polymer of D-galactaconic acid linked by an α-1,4-glycosidic bond. Pectin compounds are widely used in pharmaceutical, food, and beverage industries. This study aimed to determine pectin levels in banana peel and banana raja. This study was done by extraction method using HCl, added with 96% ethanol to filtrate to precipitate the pectin, then dried to obtain dry pectin. The solvent used was 0.05 N HCl (pH 1.5) with extraction temperature 90 for 80 minutes. The results showed that the extraction of banana kepok peel produced 12.243% pectin, while the extraction of banana raja peel produced 6.383% pectin.
Penentuan Kadar Kalsium (Ca) dalam Kulit dan Daging Buah Naga Merah (Hylocereus polyrhizus) yang Berasal dari Sidera Miswan, Miswan; Said, Irwan; Ratman, Ratman
Jurnal Akademika Kimia Vol 7, No 3 (2018)
Publisher : Universitas Tadulako

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Abstract

This study aims to determine the calcium in peel and flesh of red dragon fruit (HylocereusPolyrhizus) Sample uses red dragon fruit aged 2 months, which is ripe on the tree. This research used the Spectrophotometric method, the analysis method based on the measurement of light absorption. Using spectro-direct as an instrument and tablet (Ca) as an indicator. From these studies, it was obtained in calcium levels: for peel was 9.21 mg/100 g and flesh red dragon fruit was 18.10 mg /100 g.

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