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Jurnal Akademika Kimia

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Published by Universitas Tadulako

ISSN : 23026030 EISSN : 24775185 DOI : https://doi.org/10.22487/

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 137 Documents

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Effect of Different Types of Extractants in the Separation of Rare Earth Metals using Emulsion Liquid Membrane Method: A Review Ninda Anisyabana; Anni Anggraeni; Uji Pratomo; Riska Anbar Fadiyah
Jurnal Akademika Kimia Vol. 10 No. 2 (2021)
Publisher : Universitas Tadulako

Rare Earth Metals (REMs) are minerals which needed in modern technology because it has unique chemical, catalytic, electrical and paramagnetic properties, so REMs have the potential to be applied in various fields. The similarity in the physical and chemical properties of REMs causes them to be difficult to separate from their parent minerals. Emulsion Liquid Membrane is an effective and efficient method for REMs purification and separation because in practice it only requires a small amount of solvent, the diffusion rate and mass transfer are high, fast, and simultaneous compared to the solvent extraction method which requires many extraction steps and requires a lot of solvents. In the emulsion liquid membrane method, one of the factors that can determine the success of the extraction process is the selectivity of the ligands/extractants. The extractants must be highly selective against the target REM ions, both in the external aqueous phase and the internal aqueous phase. Therefore, this review aimed to determine the selectivity of various types of extractants such as D2EHPA, Cyanex 302, Cyanex 572, (RO)2P(O)OPh-COOH, Aniline, and TBP on extraction efficiency and stripping efficiency in the separation of rare earth metals through the emulsion liquid membrane method.

Softening Hard Water using Cocoa Shell Activated Charcoal Nurhayati Nurhayati; Ahmil Ahmil; Khairuddin Khairuddin; Tri Handayani; Ahmad Fauzan Tambuak
Jurnal Akademika Kimia Vol. 10 No. 2 (2021)
Publisher : Universitas Tadulako

Cocoa pod shells contain 23-54 % cellulose, 1.14 % hemicellulose, and 20-27.95 % lignin. The high cellulose content in the cocoa pod shell has the potential to be further processed into adsorbents. Before being used as an adsorbent, activation using HCl solution was carried out to increase the adsorption power of the cocoa shell. This research was conducted to analyze the influence of adsorbent dose, pH solution, the efficiency of hard water reduction, and adsorption capacity on Ca2+ and Mg2+ ions. Adsorption of hard water ions was conducted by varying adsorbent doses of 1, 3, 5, 7, and 9 g and varying at the pH of 5, 6, 7, 8, and 9. Optimum condition achieved at the mass of 5 g with Ca2+ and Mg2+ ions adsorption efficiency of 85.4 and 18.31%, respectively. Optimum condition achieved at the pH of 9 with Ca2+ and Mg2+ ions adsorption efficiency of 61.54 and 49.11%, respectively. The highest Ca2+ and Mg2+ ions adsorption capacity was obtained at the adsorbent mass of 1 g with adsorption capacity respectively 4.05 and 0.54 mg/g. The highest Ca2+ and Mg2+ ions adsorption capacity was obtained at a pH of 9 with an adsorption capacity of 4.05 and 0.54 mg/g, respectively.

Analysis of Student’s Creative Thinking Ability on Colloid Material Siti Arma; Supriadi Supriadi
Jurnal Akademika Kimia Vol. 11 No. 1 (2022)
Publisher : Universitas Tadulako

This study aimed to describe students' creative thinking skills in Colloid material in class XI SMA Negeri 7 Palu. The type of this research was descriptive quantitative. The research sample consisted of 30 students. The data collected were in the form of test results for the ability to think creatively, which were obtained through giving essay questions as many as five items that expert validators had validated. The results of every item were on average 74.4% of fluency, while flexibility, elaboration, and originality, respectively, were 75.83%, 53.76%, 61.66%, and 47.5%. Based on the analysis of the four indicators above, it can be found that the students' creative thinking ability on colloid material in class XI SMA Negeri 7 Palu was in the medium category. Students need to be accustomed to working on questions that can require them to think creatively during learning to develop their ability in creative thinking and connect theory with everyday life.

The Ability of Chemistry Problem Solving of Senior High School Students in Palu Sulawesi Tengah Ijirana Ijirana; Sitti Aminah; Supriadi Supriadi; Detris Poba
Jurnal Akademika Kimia Vol. 10 No. 2 (2021)
Publisher : Universitas Tadulako

The research is purposed to describe the problem-solving ability of the Senior High School XI grader students in Palu city. The measurement of the problem-solving ability could be determined by solving the exercises of Hydrocarbon and Thermochemistry topics using the Polya’s sequences; consisting of understanding the problem, devising, doing the plan, and evaluating. The ability of students’ problem solving is classified well in every sequence in case of the number of high category students is 60%. The samples are 240 of 507 XI grade students learning chemistry in SMAN 3 and SMA Madani Terpadu in Palu City. The data of problem-solving is determined by providing a test in the form of a validated assay. The result shows the average of XI graders in Palu City only capable of solving the problem without understanding, devising, and evaluating while solving hydrocarbon topics. The ability is not even possessed by students in Thermochemistry. It implies that senior high school students in Palu could not represent the problem in the form of figure, symbol, statement, and mathematics statement or have not been able to devise the problem solving and correlate the obtained result with the related theory or concept. Therefore, the students should be trained to solve the problem in learning by application the problem-solving sequences.

Development of Nanocomposite Films with Durian Peel Nanocrystalline Cellulose Zeinur Rochma Fandis Romadhon; I Gusti Made Sanjaya
Jurnal Akademika Kimia Vol. 10 No. 4 (2021)
Publisher : Universitas Tadulako

This research aims to synthesize and characterize nanocomposite film with nanocrystalline cellulose (NCC) durian peel waste filler. Nanocomposite film was prepared by adding NCC with concentrations of 0%, 1%, 3%, 5%, and 7% to each mixture of chitosan and guar gum. Characterization of nanocomposite film includes tensile strength test, elongation test, water-resistance test, and biodegradability. Nanocomposite film with NCC 7% showed a tensile strength value of 21.988 MPa; elongation of 10.3%; and experienced degradability of 4.05 mg/day, besides the characterization of the equal distribution of NCC in the chitosan-guar gum matrix was proven from the SEM results.

Applying Science Process Skills in Understanding Chemical Equilibrium Through Experiment Friska Purba; Debora Suryani Sitinjak; Kelly Sinaga
Jurnal Akademika Kimia Vol. 10 No. 2 (2021)
Publisher : Universitas Tadulako

Students from Teachers College coming from various regions causes variations in the cognitive, affective, and psychomotor level. Some of them have a difficulty that leads to misconception in understanding the content in chemistry, particularly on chemical equilibrium. One of the ways to comprehend that content is by conducting experiments. This study aims to apply science process skills in understanding chemical equilibrium through the experiment method. This research also helps students in their experiments in which their ability is shaped to reach the level of application. Through experiment method, science process skill will develop and give a good response in giving action both in cognitive comprehension and ineffective as well as psychomotor level. The research method used is pre-experimental with a One-Group Pre-Post test Design. The result showed N-gain was 0.7, which classified high categories and science process skills showed good categories. The final result of this research was that students would be able to understand chemical equilibrium better by applying science process skills with an experiment.

Profile Secondary Metabolite Compounds and Antioxidant Activities of Stem Bark Jambu Mete (Anacardium occidantale L.) Extract Tarso Rudiana; Dhyneu Dwi Jayanti; Siti Solehah
Jurnal Akademika Kimia Vol. 10 No. 3 (2021)
Publisher : Universitas Tadulako

Oxidative stress is a condition in which the amount of free radicals and antioxidants in the body is not balanced, causing various diseases. One of them is a degenerative disease. Oxidative stress can be reduced by antioxidant compounds. Anacardium occidentale L. is a type of plant from the Anacardiaceae family. This plant is found in many trophic countries included Indonesia, and is believed to ward off degenerative diseases caused by oxidative stress. The purpose of this study was to analyze the activity of A. occidentale stem bark extract against DPPH radical inhibition (1,1-Diphenyl-2-Picrilhidrazil) and the profiling of secondary metabolites in their active fraction. The bark of A. occidentale was extracted by a gradient maceration method. The solvents used were n-hexane (nonpolar), ethyl acetate (semi-polar), and methanol (polar). The macerate was concentrated using a rotary vacuum evaporator, followed by DPPH radical inhibition analysis using a spectrophotometer. The most active extract was analyzed for chemical content by LC-MS/MS. The results showed that the extract of A. occidentale stem bark had antioxidant activity. Methanol extract obtained very strong and best antioxidant activity with an IC50 value of 47.13 ppm compared to ethyl acetate extract and n-hexane extract, which had IC50 values of 163.92 ppm and 501.72 ppm, respectively. Secondary metabolites that are thought to have antioxidant activity in the methanol extract of A. occidentale stem bark were epigallocatechin (EC) and epigallocatechin gallate (EGCG) compounds.

Pre-service Chemistry Teachers’ Mental Model of Colligative Properties for Nonelectrolyte Solutions Kelly Sinaga; Debora S. Sitinjak; Friska J. Purba
Jurnal Akademika Kimia Vol. 10 No. 3 (2021)
Publisher : Universitas Tadulako

Mental models are representations that describe the understanding of the three levels of representation in chemistry, that is macroscopic, sub-microscopic, and symbolic. This study aims to obtain a general description of the mental model of pre-service chemistry teachers in the colligative properties of non-electrolyte solutions. The study was a descriptive research with 22 second-year FIP Chemistry Education students from Pelita Harapan University Tangerang. Data collection was carried out with research instruments in the form of diagnostic tests. The results of the study state that the average percentage level of representation is 67 % macroscopic level, 31% sub-microscopic level, and 72 % symbolic level. The results of this study indicate that students' understanding at the macroscopic and sub-microscopic level of the colligative properties of non-electrolyte solutions was low compared to chemical representations at a symbolic level. Meanwhile, the categories of mental models possessed by pre-service chemistry teachers in the topic of non-electrolyte colligative properties vary for each level of chemical representation. Based on the percentage at each level of representation, the mental model of chemistry teacher candidates with a symbolic model category is higher than the scientific model. The low mental model of the scientific model contributed to the understanding of the pre-service chemistry teachers that the concept of chemistry is not intact scientifically.

Improvement Physics 1 of Chemistry Learning Outcomes Through Project-Based Learning Models (PjBL) Using Quizizz Online Learning Media Leony S. L. Purba; Meida E. Marpaung; Nelius Harefa; Anugrah Purba
Jurnal Akademika Kimia Vol. 10 No. 3 (2021)
Publisher : Universitas Tadulako

Improving cognitive abilities, namely learning outcomes is one of the objectives of learning. Learning outcomes can be improved through the use of creative, innovative learning models in accordance with the current curriculum, the 2013 revised curriculum. This study aims to determine whether there is an increase in Physics Chemistry Learning Outcomes 1 through the Project-based Learning (PjBL) Learning Model using Quizizz online learning media. Based on the results of the normality and homogeneity test, the data is normally distributed with the value of the normality test result of 0.638 (sig 0.05) and homogeneous with the homogeneity test result value of 0.144 (sig 0.05). The results of statistical analysis of research data using the paired t-test hypothesis test results obtained tcount = 17,685 (sig 0.00) and ttable = 0.684 (sig 0.05), it is concluded that there is an increase in learning outcomes in Physics Chemistry 1 through the Project-based Learning (PjBL) learning model using Quizizz online learning media because tcount˃ ttable. A further test is the gain test, to determine the level of improvement in learning outcomes. The results of the analysis using the gain test, the gain value of 42.51%, with the medium category.

Misconceptions Reduction of Science High School Students on Buffer through Remedial Using Conceptual Change Anna Kurnia; Tri Santoso
Jurnal Akademika Kimia Vol. 10 No. 3 (2021)
Publisher : Universitas Tadulako

This study aimed to analyze the results of the reduction of misconceptions among SMA Negeri 5 Palu students on the buffer material using the conceptual change learning strategy. This research is a type of pre-experimental research with a research design that is One group pretest-posttest design. This study contained one experimental group, namely students whose learning outcomes did not reach the minimum completeness criteria (MCC), then given a pre-test to determine the initial state of the experimental group, then given treatment, and given a post-test. Testing student misconceptions data using CRI. The results showed that the average percentage of students, who knew the concept (KC), did not know the concept (DKC), and misconceptions (MC) before the application of conceptual change learning strategies were 38.1%, 45.2%, and 16, respectively. 6% and the percentage of students knowing the concept (TC), not knowing the concept (NKC), and misconception (MC) after the application conceptual change learning strategies respectively 87.4%, 12.6%, and 0%. In conclusion, the average percentage reduction in misconceptions of grade XI IPA SMA Negeri 5 Palu on the buffer through remedial using the conceptual change learning strategy was 16.6%

Page 7 of 14 | Total Record : 137

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Daud K. Walanda

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Program Studi Pendidikan Kimia-FKIP Universitas Tadulako Jl. Soekarno-Hatta Km.9, Palu-Indonesia 94119

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Kota palu,

Sulawesi tengah

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Daud K. Walanda

Contact Email walanda@gmail.com

Phone +6281245207927

Journal Mail Official jak.untad@gmail.com

Editorial Address Program Studi Pendidikan Kimia-FKIP Universitas Tadulako Jl. Soekarno-Hatta Km.9, Palu-Indonesia 94119

Location Kota palu, Sulawesi tengah INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Daud K. Walanda

Contact Email
walanda@gmail.com

Phone
+6281245207927

Journal Mail Official
jak.untad@gmail.com

Editorial Address
Program Studi Pendidikan Kimia-FKIP Universitas Tadulako Jl. Soekarno-Hatta Km.9, Palu-Indonesia 94119

Location
Kota palu,

Sulawesi tengah

INDONESIA