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Daud K. Walanda
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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 201 Documents
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Effect of Problem Based Learning Model on the Chemical Reaction Rate toward Critical Thinking Ability of Students Kasmiati Kasmiati; Tahril Tahril; Vanny M. A. Tiwow
Jurnal Akademika Kimia Vol. 9 No. 4 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i4.pp183-190

Abstract

This study aimed to identify the effect of the problem-based learning model on the reaction rate toward critical thinking abilities of students of MAN 1 Palu. This study was a quasi-experiment with a pretest-posttest control group design. Sampling was taken by purposive sampling technique with the sample of class XI MIA 3 as the experimental group (n = 18) and class XI MIA 4 as the control group (n = 14). The results of the study and data analysis obtained an average value of students' critical thinking skills from the questionnaire that the experimental group was 82.95%, higher than the control group (73.43%). The average value of students' critical thinking skills from the description test showed that the experimental group was 79.42%, higher than the control group (58.02%). Students' critical thinking skills data using parametric statistical analysis with t-test (right-party t-test) obtained tcount > ttable was 6.83 > 2.04 which corresponds to the H1 acceptance area, therefore H1 was accepted and H0 rejected. This means that students 'critical thinking skills in the experimental group were higher than in the control group. The results of this study concluded that the problem-based learning model had a significant influence on the thinking ability of students in grade XI on the reaction rate at MAN 1 Palu.
Flower Extracts of Cage Plants (Canavalia virosa) as an Indicator of Acid Base Andi M. Rendi; Supriadi Supriadi; Suherman Suherman
Jurnal Akademika Kimia Vol. 9 No. 4 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i4.pp191-198

Abstract

Cage plants (Canavalia virosa) are classified as nuts. This study aims to prove the flowers of the cage plants as acid-base indicators and determine the type of acid-base titration that is suitable for indicators of cage plants. The flowers of the cage plants were macerated with ethanol. Extras were tested as indicators in acid-base solutions, buffer solutions, and compared with phenolphthalein and methyl orange for acid-base titration, namely: strong acid with a strong base, a weak acid with a strong base, and weak base with strong acid. The results obtained in this study, namely: flower extracts of cage plants in strong red acid, in weak acid pink, in strong green bases, and weak bases in light green. In a buffer solution of pH 1 to pH 11, the flower extract of the cage plants gives 4 color groups, namely: a buffer solution with pH 1 colored red, pH 3 colored pink, pH 5 to pH 9 being light green, and pH 11 being dark blue. Cage plant flower extract can be used as an indicator of acid-base, cage plant flower extract can be used on strong-base strong acid titration, strong weak-acid base, and weak-strong base acid titration.
Effectiveness of Google Classroom in Chemistry Learning on Stoichiometry Topic Viewed from Students’ Learning Motivation Emi Sulmeni; Daud K. Walanda
Jurnal Akademika Kimia Vol. 9 No. 4 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i4.pp199-204

Abstract

This study aimed to determine the effectiveness of using google classroom in chemistry learning in terms of student learning motivation in MAN 2 Parigi, Sulawesi Tengah Indonesia. The sample in this study was students in class X MIA 2 (n = 23). The data analysis technique was the effect size d Cohen test, the value was 0.86 which had a very large effect category. This influence can be seen from students' learning motivation which increased with an average score of 3.70 which had a very good category. Based on these data it can be concluded that Google classroom affected the students’ learning results and learning motivation.
Oil Palm Empty Bunch Compost as a Source of Humic Acid Irma D. Oktavianta; Gusrizal Gusrizal; Nurlina Nurlina
Jurnal Akademika Kimia Vol. 9 No. 4 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i4.pp205-212

Abstract

Humic acid is a fraction of humic compounds that are part of soil organic matter. In this research, humic acid is extracted from oil palm empty fruit bunches compost. Compost is made from the process of counting the empty oil palm bunches, which are composted until the compost is cooked. The humic acid extraction process uses a strong base extraction method. The principle of humic acid extraction is to dissolve the humic compound with a base solution and then separate it by adding an acid solution (HCl solution). The extraction of humic acid from oil palm empty fruit bunches compost produced blackish-brown humic acid with a yield of 4.895%. The result showed that the main functional group content of palm oil empty fruit bunches compost humic acid was the -OH group and phenol group which had a conjugated carbonyl group and a more aliphatic humic acid structure. Quantitatively, the functional groups of humic acid functional groups each amounted to a total acidity of 7,400 cmol/kg, a carboxylic group of 520 cmol/kg, and a phenolic -OH group content of 6,880 cmol/kg. Research results show that oil palm empty fruit bunches compost can be used as a source of humic acid.
The Effect of Practical Learning on Creative Thinking Skills of High School Students on Acid-Base Sayid Z. S. Alwi; Suherman Suherman
Jurnal Akademika Kimia Vol. 9 No. 4 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i4.pp213-218

Abstract

This study aims to determine the effect of practical learning on the creative thinking skills of class XI students on acid-base material at SMAN 7 Palu. This type of research was a quasi-experimental research with equivalent control group design. Sampling in this study was a purposive random sampling technique. The sample consisted of two classes students in XI MIA 2 as the experimental class (n = 24) and students in class XI MIA 4 as the control class (n = 24). Data from students' creative thinking using the one-party hypothesis testing, the right side were in this study used the statistics application and obtained sig. (2-tailed) 0,000 data based on this decision, the hypothesis is accepted if the sig (2-tailed) value is smaller than 0.05 so that it can be concluded that there is a positive effect using practical learning on the creative thinking ability of class XI students on acid-base material at SMAN 7 Palu.
Analysis of Flavanoids in Flour and Biscuit based on Chayote Jamaludin M. Sakung; Sitti Rahmawati; Nursafitri Nursafitri; Husniah Muhtar
Jurnal Akademika Kimia Vol. 9 No. 4 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i4.pp219-223

Abstract

Chayote-based flour and biscuits are the development of healthy food products that contain flavonoid compounds that can be used to protect and reduce skin damage to UV rays. This study aimed to determine the flavonoid content in chayote-based flour and biscuits using the AlCl3 method with a UV-Vis spectrophotometry at a wavelength of 520 and 700 nm. The results obtained the flavonoid levels in chayote-based flour and biscuits of 0.325±0.011 mg/L and 0.117±0.023 mg/L or equivalent to 0.812±0.028 mg/100 gram and 0.291±0.058 mg/100 gram. This study concluded that chayote-based flour and biscuits contained flavonoids can be used as a source of antioxidants and a source of beneficial nutrition.
Determination of Optimum pH and Contact Time from the Adsorption Process of Cu(II) Ions by Corn Cob (Zea mays) Biomass Riska T. Windiastuti; Tri Santoso
Jurnal Akademika Kimia Vol. 9 No. 4 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i4.pp224-229

Abstract

The use of Cu in daily life and industry can produce toxic waste, both for the human body and the environment. This study aimed to determine the optimum pH value and contact time, and the maximum capacity of the adsorption process of Cu(II) ions by corn cob biomass. The optimum pH and contact time were determined based on the adsorption graph of the adsorbent obtained from the optimization of pH and time, while the maximum adsorption capacity was determined using the Langmuir adsorption isotherm equation. The results showed that the optimum pH adsorption of Cu(II) ions by corn cob absorbent occurred at pH 7 with the absorption of 98.34%. Optimum contact time occurred at the 60th minute with the percentage of copper absorbed was 96.37%. Besides, the maximum capacity adsorption of corn cobs toward Cu(II) ions was 2.416 mg/g. This study concluded that corn cobs can be used as an adsorbent of Cu(II) ions.
The Booklet Development of Inorganic Fertilization System Based on Problem M. A. Y. Nirmalasari; Yovita Y. Bolly
Jurnal Akademika Kimia Vol. 9 No. 4 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i4.pp230-236

Abstract

The use of inorganic fertilizer in the tillage was mostly used by Sikkanese. The reason was the large supply of inorganic fertilizer on the market, fast response, easy to absorb, and not to waste times. In the implementation, inorganic fertilizer was not used accordance with the stipulation of the four rights (4T): right dose, right time, right place, and right source. The result was the decrease of soil quality and the death of soil-degrading microorganisms so that the soil became infertile. Therefore, the booklet as a learning media gave the right information about the proper fertilization system. The research aims to know the appropriateness of the booklet development of inorganic fertilization system. The method used was the research and development (R n D) method by adopting a Borg and Gall model. The sample was taken by using purposive sampling. The analysis technical was validity analysis (valid percentage) and appropriate analysis (Widoyoko categorial). The result of the study showed that the booklet was appropriated to use as a medium of information for the farmer with the feasibility category both at the initial field trial and field trial stages. Furthermore, in the field trial implementation, the booklet was suitable to use with the very good feasibility category.
A Prenylated Flavonoid from the Methanol Fraction of Breadfruit Root (Artocarpus communis) Kristina Damiyanti; Ari Widiyantoro; Rudiyansyah Rudiyansyah
Jurnal Akademika Kimia Vol. 9 No. 4 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i4.pp237-244

Abstract

Breadfruit (Artocarpus communis) is a tropical fruit plant that belongs to the genus Artocarpus of the Moraceae family. Prenylated flavonoid compounds were isolated from the methanol fraction of breadfruit root wood using maceration, partitioning, and chromatography methods, while characterization was carried out through phytochemical tests and 1H-NMR spectrum data analysis. The K1D2 (P1) compound obtained was a yellow solid with a mass of 5 mg. The phytochemical test of the K1D2 (P1) compound gave positive results for the flavonoid group. The 1H-NMR spectrum data (CDCl3, 500 MHz) of compound K1D2 (P1) showed a typical chemical shift at δH 13.42 (1H, s, 5-OH) for the hydroxy groups associated with carbonyl; 7.68 (1H, d, J = 8.5 Hz, H-6 ′); 6.71 (1H, dd, J = 16.0; 7.1 Hz, H-10); 6.56 (1H, d, J = 16.0 Hz, H-9); 6.54 (1H, dd, J = 8.5; 1.8 Hz, H-5 ′); 6.46 (1H, s, H-3); 6.42 (1H, d, J = 1.8 Hz, H-3 ′); 6.26 (1H, d, J = 9.3 Hz, H-14); 5.42 (1H, d, J = 9.3 Hz, H-15); 3.94 (3H, s, 2′-OCH3); 2.47 (1H, m, H-11); 1.97 (3H, s, H-17); 1.69 (3H, s, H-18), and 1.10 (6H, d, J = 6.7 Hz, H-12 and H-13). Based on the results of phytochemical tests and analysis of 1H-NMR spectrum data compared with literature data, it showed that the isolated K1D2 (P1) compound is 4 ′, 5-dihydroxy-6,7- (2,2-dimethylpirano) -2'-methoxy- 8γ, γ-dimethylallylflavone (1).
Analysis of Well Water Quality based on Physics, Chemical, and Microbiology Parameters in IAIN Tulungagung Area Tutik S. Wahyuni; Desi Kartikasari
Jurnal Akademika Kimia Vol. 9 No. 4 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i4.pp245-250

Abstract

Water as a natural resource is needed in life. Nowadays, the need for freshwater is increasing. Meanwhile, most people fulfill their daily water needs from well water. This study aims to determine the quality of well water in the IAIN Tulungagung campus area based on physical, chemical, and biological parameters. This type of research is a quantitative descriptive. A total of 12 points from 4 stations were chosen by random sampling. Laboratory test results were compared with PerMenKes RI No. 492/MENKES/PER/IV/2010 and PerMenKes RI No. 32 Tahun 2017. The results of the study show that (1) two sources of water do not qualify as clean water based on physical parameters because the turbidity value and total dissolved solids (TDS) exceeds the quality standard, (2) five sources of water do not qualify as water clean based on chemical parameters because the Fe content exceeds the quality standard and/or low dissolved oxygen (DO) concentration, and (3) four wells do not meet bacteriological tests for the amount of coli fecal bacteria and total coliform. Well water in the IAIN campus area has decreased water quality caused by domestic waste.

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