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JKPK (Jurnal Kimia dan Pendidikan Kimia)

jkpk
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Published by Universitas Sebelas Maret

ISSN : 25034146 EISSN : 25034154 DOI : -

Core Subject : Science, Engineering,

Chemical Engineering, Chemistry & Bioengineering Chemistry

The JKPK (Jurnal Kimia dan Pendidikan Kimia) is a national journal, published three times a year in April, August, and December, containing research articles on Chemistry and Chemistry education.

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Articles 255 Documents

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INFLUENCE OF CONTACT TIME ON LOADING 99MO(N,Î³) WITH ALUMINA COLUMN IN 99MO / 99MTC GENERATOR Sulaiman, Sulaiman; Sugiharto, Yono; Setiawan, Gatot; Chairuman, Chairuman; H.G., Adang
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 4, No 3 (2019): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Alumina is usually used for 99Mo absorbers obtained from 235U fission product because the use of 235U is getting limited, and as an alternative 99Mo obtained from natural MoO3 irradiation was used. The problem is that 99Mo produced was not carrier-free as 99Mo from 235U fission product because not all MoO3 is activated to 99Mo, then it is necessary to know the effect of contact time when loading 99Mo into the alumina column. To find out the effect of contact time, the experiment was carried out using 99Mo pH 4, acid alumina column, contact time was varied between 1 to 60 minutes with interval of 15 minutes, and the column was eluted using 2 kinds of eluent namely 0.9% NaCl and MEK. The elution of 99Mo/99mTc generator is performed 3 times, days 1, 2 and 3. The results showed that the performance of alumina in absorbing 99Mo influenced by time. The optimal contact time is 15 minutes for 0.9% NaCl solution and 45 minutes for MEK. The amount of 99Mo breakthrough (µCi99Mo/mCi99mTc) from the alumina column increases with elution time both using 0.9% NaCl or MEK. The 99mTc eluate obtained from this study does not meet standard requirements. The use of a tandem column is needed to prevent 99Mo breakthrough on the 99Mo/99mTc generator to get the 99mTc which meet standard requirement.

Designing Calorimeter Made from Various Wastes Farida, Ida; Akbar, Gilang Saeful; Aisyah, Riri
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 5, No 1 (2020): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

A research has been conducted which aims to design a waste-based calorimeter as an alternative to measuring heat for chemistry practicum in schools. Research products developed through the steps of design-based research comprising the steps of analysis, design, and development. The resulting product is a waste-based calorimeter equipped with an automatic stirrer. The container to store the reagent solution on the calorimeter is made of Styrofoam, paper, plastic, melamine, PVC and bamboo. Optimization tool was conducted to determine the heat capacity of the calorimeter and the enthalpy of neutralization. The highest accuracy calorimeter value between 78-97%. Bamboo calorimeter has the highest accuracy value (97%). Styrofoam calorimeter has the lowest accuracy values (78%). Based on the results of the validation and feasibility test it can be concluded that the product is declared valid and feasible.

PENINGKATAN PENGUASAAN KONSEP DAN KETERAMPILAN BERPIKIR KRITIS SISWA MELALUI IMPLEMENTASI MODEL PEMBELAJARAN INKUIRI PADA MATERI POKOK LARUTAN PENYANGGA Prasetyowati, Eka Novvy; Suyatno, Suyatno
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 1, No 1 (2016): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Penelitian ini ditujukan untuk mendeskripsikan pengaruh penerapan model pembelajaran inkuiri terhadap penguasaan konsep dan keterampilan berpikir kritis siswa, serta mendeskripsikan hubungan antara keterampilan berpikir kritis dengan penguasaan konsep siswa. Penelitian ini merupakan gabungan dari penelitian pra-eksperimen jenis one group pre test-post test design dan penelitian korelasional, yang diawali dengan pengembangan perangkat pembelajaran menggunakan model Dick & Carey. Penelitian ini dilaksanakan di SMAN 1 Gresik dengan sampel siswa kelas XI IPA-3. Data tentang penguasaan konsep dan keterampilan berpikir kritis siswa dianalisis secara deskriptif, sedangkan hubungan antara keterampilan berpikir kritis dan penguasaan konsep dianalisis dengan teknik korelasi product moment. Berdasarkan hasil analisis data dapat disimpulkan bahwa (1) Pembelajaran kimia pada materi pokok larutan penyangga dengan model inkuiri dapat meningkatkan penguasaan konsep dan keterampilan berpikir kritis siswa (2) Ada hubungan yang kuat dan signifikan antara keterampilan berpikir kritis dengan penguasaan konsep siswa.

The Quality Improvement of Cotton Dyed Fabric Using Extract of Avocado Peel Waste with the Addition of Alum Mordant Method Ikhwanul Muslim; Henny Chandra Puspita Devi
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 4, No 3 (2019): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v4i3.29868

The utilization of organic waste is an effort to reduce the amount of household waste. In addition, the use of organic waste as dyestuff can also reduce dependency of synthetic dyes that are toxic. In this study, natural dyes were obtained from the extraction of avocado peel which is act as household waste. Coloration is done on cotton fabric with a variety of adding mordan alum methods to improve the color fastness of the colored fabric. From the experimental results it was found that from the three variations of method, the simultaneous method produced the highest color intensity (K/S) value of 1.7854. While the color difference that shows the best result is the final mordan method with a value of 0.010. The results of testing color fastness for washing and rubbing showed that materials in mordan have better color fastness quality than materials that are not in mordan.

Misconceptions of High School Students in Salt Hydrolysis Topic Using a Three-Tier Diagnostic Test (TTDT) Tri Prianti; Elfi Susanti VH; Nurma Yunita Indriyanti
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 5, No 1 (2020): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

This study aims to find out whether high school students in Surakarta have misconceptions in salt hydrolysis material and to find out which concept is the most misconception experienced by high school students in Surakarta in salt hydrolysis material. This study used a descriptive approach. Data collection techniques using data triangulation technique from the results of the Three-Tier Diagnostic Test (TTDT), formative tests, and interviews. The sample used in this study was determined using a purposive sampling technique. Based on the research conducted, high school students in Surakarta experienced misconceptions in salt hydrolysis material as much as 36.75%, 35.94% Scientific knowledge, 15.63% lack of knowledge, and 10.90% error. Most misconceptions experienced by high school students in Surakarta on salt hydrolysis material occur in sub concepts: a) conclude the acid-base properties shown from salt solutions (49.91%), b) calculate the pH of the salt solution (39.15), c) analyze the reaction salt hydrolysis (37.21%), d) analyze the concept of hydrolysis that occurs in solution (35.98), e) determine the types of hydrolysis of salt (21.87%).

ANALISIS PROKSIMAT DAN SIFAT ORGANOLEPTIK “ONCOM MERAH ALTERNATIF” DAN “ONCOM HITAM ALTERNATIF” Sri Mulyani; Restu Widyana Wisma
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 1, No 1 (2016): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Oncom is a typical food of the people of West Java. So far there are two types of oncom known, namely red oncom and black oncom. Red oncom is generally made from tofu cake (soybean that has been taken protein in making tofu) with mold Neurospora sitophila. While black oncom is generally made from peanut cake which is sometimes mixed with tapioca flour with Rhizopus oligosporus tempeh mold. This research was conducted to utilize a mixture of tofu waste (ampas), tapioca waste (onggok) and peanut oil waste (bungkil) which is widely distributed in West Java to be processed into a type of oncom food so that it can be utilized. Because the raw material and composition used in this study are different from red oncom and black oncom in general, they are called "alternatif red oncom" and "alternatif black oncom". This study aims to analyze the proximate specifically the protein and fat content, as well as the organoleptic properties of "alternatif red oncom" and "alternatif black oncom". This study was conducted with experiments in the laboratory and the data were analyzed using descriptive statistical methods. The research was begun by making oncom from raw materials mixture of the tofu waste (ampas), onggok, and bungkil, then fermented with N. sitophila microbes for "alternatif red oncom" and R. oligosporus for "alternatif black oncom". After the oncoms were formed, the protein content was tested using the Kjeldahl method and fat content using the Soxhlet method. Organoleptic test of oncom products before and after being processed into food is carried out by the Hedonic test. The results showed that the protein content of "alternatif red oncom" (2.78 ± 0.05 %) is higher than "alternatif black oncom" (1.88 ± 0.05 %), and the fat content in "alternatif red oncom" (2.31 ± 0.05 %) is higher than "alternatif black oncom" (1.90 ± 0.05 %). The organoleptic test results showed that in terms of color, aroma, and texture "alternatif black oncom" tends to be preferred by panelists than "alternatif red oncom".

Development of Computerized Testlet to Measure Science Process Skill on Stoichiometry Stefanus Kristiyanto; Ashadi Ashadi; Sri Yamtinah; Sri Mulyani
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 4, No 3 (2019): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

This research aims to develop a computerized testlet assessment to measure science process skills on stoichiometry material in terms of validity, reliability, difficulty level, distinguishing features and deception indexes that meet the criteria as good assessment instruments, and can display individual profiles of science process skills students. The subject of the research trial was a grade X student of Senior High School in Boyolali. Validity test is done by content validity, criteria, and expert validation. Reliability test is done by finding the price of the reliability coefficient r. Characteristics test is done by determining the level of difficulty, distinguishing features and deception index. The profile of science process skills is determined by measuring students' mastery of the science process. The results of the research and development was declared feasible and met the criteria as a good question with a validity of questions more than 0.79 (valid), has a test reliability on the main field trials of 0.643 and 0.610 on the trial the implementation of the field is relatively high, has a distinguishing power with a percentage of 10% bad, 66.7% is sufficient, and 23.3% is good, has a difficulty level with a percentage of 20% difficult, 53.3% moderate and 26.7% easy.

Developing Small Scale Chemistry Practicum Module to Identify Students’ Ability in Predict-Observe- Explain (POE) Implementation Johnsen Harta; Risnita Vicky Listyarini; Fransisca Ditawati Nur Pamenang; Lucia Wiwid Wijayanti; Wonkoo Lee
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 5, No 1 (2020): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Chemistry practicum does not have to be complicated and requires expensive apparatus and chemicals, and is considered not environmentally friendly. The concept of small scale chemistry practicum is one of appropriate technology that is packaged elegantly to introduce and embed the principles of green chemistry in every chemistry experiments, and also to enhance the concepts of chemistry through verification and scientific discovery. This study aims to create the newest product, the small scale chemistry practicum module to identify the ability of the students of chemistry education study program, Sanata Dharma University, Yogyakarta in formulating predictions on phenomenon based on the insights they have, making direct observations through small scale chemistry practicum, and explaining the results of observations and emphasis on concepts in detail and depth. This research is the development research with the model of Analysis, Design, Develop, Implement, and Evaluate (ADDIE). Data were analyzed by descriptive analysis and Rasch Model. The results of the study show that the product developed has a perfect and feasible level of readability to be tested. From the content aspect, it presented in perfect criteria, as well as the construction aspect and aspect of language, also shows good value. The students already have quite an excellent ability to predict (average score= 76), observe (average score= 88.5), and explain (average score 87.5). Also, it was noted that students enthusiastically applied POE, and the results of POE students show good person reliability value (0.88) in small scale chemistry experiments. The product developed has been valid, effective, and practical for use in experiments according to experts and teachers, and good student responses (Cronbach's alpha value= 0.92) to the product.

Characterization of Biocomposites from Polylactic Acid and Cellulose of Oil Palm Empty Fruit Bunch Paramitha, Tika; Sitompul, Johnner P
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 5, No 3 (2020): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v5i3.39212

Biocomposites are polymers reinforced with natural fibers, such as cellulose. This research aims to synthesize cellulose from Oil Palm Empty Fruit Bunch (OPEFB) and biocomposites from PLA and cellulose. In this study, cellulose was obtained through alkalization, hydrolysis, and bleaching of OPEFB. Biocomposites production was carried out by mixing PLA and cellulose using the extrusion method. In the extrusion method, PLA and cellulose of OPEFB were mixed using an extruder above the melting point of PLA of 170°C. The output product of an extruder was then pressed using a compression moulding machine to form biocomposites. The tensile strength of biocomposites had a smaller value than pure PLA, whereas the modulus young of biocomposites with 5% by weight of cellulose had a higher value than pure PLA. The decrease in the mechanical properties of biocomposites was caused by poor adhesion between PLA and cellulose. The water absorption of biocomposites was greater than pure PLA, which was influenced by cellulose's characteristics as hydrophilic and PLA is hydrophobic. Also, the higher water absorption in biocomposites accelerated the weight loss of biodegradability.

The bioactive of Pinus merkusii needle and bark extract as antioxidantand anti-aging Febryana Ramadhani; Ermi Girsang; Florenly Florenly
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 6, No 1 (2021): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v6i1.45371

Pinus merkusii is a native pine species to Southeast Asia and has used as an oleoresins source and raw material for pulp and paper industries. This plant also possesses several biological activities, such as anti-inflammatory and larvicidal activity. This study aims to evaluate the antioxidant and antiaging activity of P. merkusii needle and bark. The qualitative phytochemical screening was used to evaluate the presence of secondary metabolites compounds. DPPH (2,2-diphenyl-1-picryl-hydrazyl) methods evaluated the antioxidant activity, and an anti-tyrosinase assay was used to evaluate the antiaging activity. Phytochemical analysis showed flavonoids, phenols, alkaloids, tannins, and terpenoids in both extracts. Bark extract showed the presence of saponins and triterpenoids, while needle extract possesses steroids. The antioxidant activity (IC50) of P. merkusii bark extract was 59.32 ± 1.74 µg/mL, stronger than needle extract (68.67 ± 1.47 µg/mL). Also, the bark extract showed higher inhibitory activity of tyrosinase (IC50) 74.97 ± 1.54 µg/mL than needle extract (96.08 ± 1.77 µg/mL). From this investigation, P. merkusii bark extracts appeared to have more potential as a natural source of antioxidants and antiaging and might be beneficial in these subjects.

Page 10 of 26 | Total Record : 255

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