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Alotrop Jurnal Pendidikan dan Ilmu Kimia
Published by Universitas Bengkulu
ISSN : 22528075     EISSN : 26152819     DOI : -
Core Subject : Science, Education,
Chemistry Education
Welcome to the Journal Alotrop, is an Open-Acces and peer-reviewed journal aims to publish scientific articles related to chemistry and education :i.e an interaction between natural sciences, educational sciences, technologies and management for both education and sciences and wise use of resources. We particularly encourage manuscripts that discuss contemporary research that can be used directly or inderecly in adressing critical issues and sharing of advanced knowledge and best practices in chemistry and education.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 218 Documents
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PERBANDINGAN MODEL PEMBELAJARAN KOOPERATIF TIPE TEAM ASSISTED INDIVIDUALIZATION (TAI) DAN THINK PAIR SHARE (TPS) TERHADAP MINAT DAN HASIL BELAJAR KIMIA SISWA Elfrida Napitupuluh; Rina Elvia; Salastri Rohiat
ALOTROP Vol 5, No 1 (2021)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v5i1.16478

Abstract

Penelitian ini bertujuan untuk menentukan perbedaan minat dan hasil belajar kimia siswa dengan menggunakan model pembelajaran Team Assisted Individualization dan model pembelajaran Think Pair Share pada materi persamaan reaksi kimia di SMAN 8 Kota Bengkulu Tahun Ajaran 2018/2019. Penelitian ini dilakukan pada bulan Februari - April 2019. Jenis penelitian ini adalah kuasi eksperimen. Populasi penelitian ini adalah siswa kelas X MIA dengan jumlah populasi 136 siswa. Pengambilan sampel dilakukan setelah uji homogenitas dan normalitas maka terpilih kelas X MIA 2 yang menerapkan model Team Assisted Individualization dan X MIA 3 yang menerapkan model Think Pair Share sebagai sampel penelitian dengan teknik purposive sampling dengan jumlah sampel 68 siswa. Analisis data yang digunakan adalah rata-rata (mean), uji normalitas, uji homogenitas,uji N-Gain Score dan uji hipotesis (uji t). Hasil penelitian secara umum menunjukkan bahwa penerapan model Team Assisted Individualization mampu memberikan hasil belajar yang lebih tinggi dari model Think Pair Share. Data hasil belajar kimia siswa diperoleh dari nilai pretest dan postest dengan selisih hasil belajar untuk kelas eksperimen I adalah 59,411 dan kelas eksperimen II adalah 57,647, berdasarkan nilai pretest dan postest didapatkan perolehan nilai N-Gain Score pada kelas eksperimen 1 besar 0,765 dan kelas eksperimen 2 sebesar 0,707. Sedangkan minat belajar kimia siswa pada kedua kelas memperoleh persentase sebesar 81,272% untuk model pembelajaran Team Assisted Individualization dan 76,647% untuk model pembelajaran Think Pair Share. Hasil uji t pada aspek kognitif didapatkan nilai sig.(2-tailed) sebesar 0,013 dan pada aspek afektif minat belajr sebesar 0,000. Hal tersebut menyatakan bahwa terdapat perbedaan yang signifikan pada minat dan hasil belajar kimia yang menerapkan model pembelajaran Team Assisted Individualization dan Think Pair Share
PERBANDINGAN HASIL BELAJAR SISWA MENGGUNAKAN MEDIA CALL CARD DAN TRUTH AND DARE Wise Meilan; Salastri Rohiat; Hermansyah Amir
ALOTROP Vol 1, No 1 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i1.2715

Abstract

This study aimed to compare the learning outcomes of students with using cooperative learning type Team Games Tournament (TGT) with media Call Card and Truth and Dare in SMA Negeri 05 Bengkulu Tengah. This research is quasy experimental with population all grade students in SMA Negeri 05 Bengkulu Tengah and the sample is X3 class as experiment class 1which implement instructional media truth and dare and X1 class  as experiment class 2 which implement instructional media Call Card. Students learning outcomes in this research extend from the difference of pretest and posttest value. In the experimental class 1 average value of students learning outcomes 69,46 while the experimental class 2 at 58,21. Through a series of statistical test done hypothesis testing using t test (0,01) was obtained t =3,13 and t table =2,39. The results of data analysis showed that shere were significant differences in student learning result between the aplication of instructional media Truth and Dare with media Call Card in hydrocarbon compound material in X grade SMA Negeri 05 Bengkulu Tengah. This can be showed t test that has been done on student learning outcomes for cognitife aspect got the result that value t table < t. The obtained t = 3,133 mean while t table = 2,397. 
PENERAPAN MODEL DISCOVERY LEARNING DENGAN MENGGUNAKAN MEDIA VIDEO UNTUK MENINGKATKAN AKTIVITAS BELAJAR DAN HASIL BELAJAR SISWA KELAS XI IPA 1 SMAN 1 KOTA BENGKULU Sitti Utami Medianty; Amrul Bahar; Elvinawati Elvinawati
ALOTROP Vol 2, No 1 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i1.4689

Abstract

[APPLICATION OF DISCOVERY LEARNING MODEL BY USING VIDEO MEDIA TO INCREASE LEARNING ACTIVITIES AND STUDENT LEARNING RESULT CLASS XI IPA 1 SMAN 1 BENGKULU CITY]. The research has goals to improve the activity and learning outcomes chemistry at XI IPA 1 class in SMA Negeri 1 Bengkulu that consist of 30 students: 23 girls and 7 boys. This study is research of class action on thermochemistry subjects by discovery learning model. This research consist three cycle on four stage: planning, action, absorption, and reflection. The data collected using test and non test that consist of post test and observation sheet of activity teacher and student. The data processed using quantitative simple analysis techniques: average score of observation sheet of activity teacher and student, average score, absorption percentage clasical, andclasssical learning completness percentage. From the reseult, we can conculded that chemistry learning process applying discovery learning model using video can improve activity and outcomes learning chemistry student. It can be see from the average score of students. In the first cycle is 69.33 in which the percentage of classical absorption is 86.67 and classical learning completeness is 66.67. The average score of the second cycle is 71,33 in which the percentage of classical absorption is 89.17 and classical learning completeness is 73.33. The students’ average score of the third cycle is 81.33 in which the percentage of classical absorption is 90.37 and classical learning completeness is 86.67. The teacher’s activities of the learning process in the first cycle get average score 26.5 and it is good category, the second cycle is 27.5 and it is good category, the third cycle is 30 and it is good category too. Meanwhile, the student’s activities in the first cycle get average score 22.5 and it is good category, the second cycle is 25 and it is a good category, the third cycle is 27 and it is good category.
PERBANDINGAN PEMBELAJARAN KOOPERATIF TIPE STRUCTURED NUMBERED HEADS (SNH) DAN NUMBERED HEAD TOGETHER (NHT) TERHADAP KEMAMPUAN BERPIKIR KREATIF SISWA KELAS X MIPA SMAN 6 KOTA BENGKULU Evi Elyani; Sumpono Sumpono; Hermansyah Amir
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9046

Abstract

The purpose of this research is to measuring the comparison of students creative thinking ability between cooperative learning model type Stuctured Numbered Heads (SNH) and Numbered Head Together (NHT) on nomenclatur of chemical compounds material in curriculum 2013 of grade X MIPA SMA Negeri 6 Bengkulu city school year 2017/2018. This research is a quasi-experimental research with total population 118 students and sample 57 students with class X MIPA D as experiment class I that apply cooperative learning model type SNH and class X MIPA B as experiment class II applying cooperative learning model type NHT. Analysis of the data used are mean values, Percentage Indicator, normality test, homogeneity test, and hypothesis test (t test). The students' creative thinking ability in this study is seen from the difference between pretest and posttest. In the experimental class I, the average value of students creative thinking ability was 51,851 while the experimental class II was 46,916. The result of t test (? = 0,05) obtained tcount> ttable is 2,645> 2,0040 indicates the accepted hypothesis  means that there is a significant difference between students' creative thinking ability using cooperative learning model type SNH and NHT, where the model of cooperative learning type SNH is more influential on students’ creative thinking ability compared with cooperative learning type model NHT. 
PROFIL FITOKIMIA DAN UJI SITOTOKSIK EKSTRAK ETANOL TUMBUHAN Zanthoxylum acanthopodium DC (ANDALIMAN) MENGGUNAKAN METODE BSLT Liis Panggabean; Nurhamidah Nurhamidah; Dewi Handayani
ALOTROP Vol 4, No 1 (2020)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v4i1.13711

Abstract

The purpose of this study was to determine the phytochemical profile of Zanthoxylum acanthopodium DC plant (Andaliman) and to know the extract part of plant ethanol Z acanthopodium DC as the best anticancer agent. Root basal samples, stem bark, leaves and fruit Z acanthopodium DC as much as 3 Kg, then dried up and smoothed. Fine samples of root, bark, leaves and fruit of Z acanthopodium DC were each weighed 450 gr and each sample was extracted using 5 L ethanol solvent. Root extract, bark, leaves and fruit Z anthoxylum acanthopodium DC obtained from extraction weighed as much as 1 g, then each of them in concentrations of 10, 100, and 1000 ppm. Cytotoxic tested using BSLT method with shrimp larvae of 10 tail, then determined LC50 by using relationship between probit and log of concentration. Each sample of fine roots, bark, leaves and fruit Z acanthropodium DC were weighed 3 grams. Then press the phytochemical profile. Phytochemical profile test results of each sample of acanthopodium DC Z showed the presence of alkaloids, flavonoids, tannins, terpenoids and saponins. The largest alkaloid content is found on the skin of stems and roots (++) with Papaya leaf comparison, the largest flavonoid content of bark (++) skin with peach flower compound, tannin leaf and tanug (+++) seedlings with Avocado seed comparator, and the largest Kandugan saponin on bark (+++) with the comparative Starfruit Wuluh. In the cytotoxic test results, each leaf extract of stem, leaves, roots and Z acanthopodium DC fruit has potential as an anticancer agent because the liberating LC50 in each sample is in the range 30-1000 ppm. The extract part of the stem bark has the greatest potential as an anticancer compared to fruits, leaves and roots. Because bark leaf extract has LC50 so that 57,677 ppm compared to root of 65,313 ppm, leaves of 77, 983 ppm, and fruit of 191,426 ppm. Usually root samples, stem bark, leaves and fruit Z acanthopodium DC can be used as an anticancer because of the content of flavonoids, saponins, alkaloids, tannins, and terpenoids.
PEMANFAATAN EKSTRAK AIR BUAH Flacourtia inermis Roxb. (LOBI-LOBI) SEBAGAI PENGAWET IKAN LAUT Ade Pribadi; Nurhamidah Nurhamidah; Elvinawati Elvinawati
ALOTROP Vol 2, No 1 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i1.4581

Abstract

[THE  UTILIZATION OF   Flacourtia inermis Roxb. (LOB-LOBI ) FRUIT WATER EXTRACTS AS A MARINE FISH PRESERVATIVE] This research aims to determine the magnitude of the concentration and the length of time the optimum soaking water extracts of fruit Flacourtia inermis Roxb. (lobi-lobi ) as well as measuring its potential for use as a preservative in marine fish. Sample marine fish used is Kerapu Macan (Epinephelus fuscogultatus). The concentration of water extract from the fruit of F.inermis Roxb  is at levels at 10, 20, 30 and 40% with soaking time each at 1, 2 and 3 hours for any variation of the concentration. Observation of the level of the fish freshness is done with a variety of storage time of 12, 18, and 24 hours at room temperature to any variation of the concentration of extract and soaking time. The parameters used in determining the level of the freshness of the sample fish is a rate of Total Volatile Bases (TVB), moisture content, and pH. The results of the research done indicate that extracts water from the fruit of F.inermis Roxb L are potential for use as a preservative of marine fish based on the values of pH and the levels of TVB. The most optimum concentration and soaking time in Kerapu Macan fish preserve during its storage was soaking with a concentration of 30% for 1 hour, i.e., able to withstand the pace of the decline of the quality of the Kerapu Macan sample for 18 hours at room temperature: with the pH 6.7 and fish TVBvalue at 29.4 mgN/100 g.
ANALISIS KEMAMPUAN TANAH DI DAERAH PEMUKIMAN KOTA BENGKULU DALAM MENJERAP ALKYL BENZENE SULPHONATE (ABS) DAN LINEAR ALKYLBENZENE SULPHONATE (LAS) Fikri Ananda; I Nyoman Candra; Elvinawati Elvinawati
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9027

Abstract

This research aims to know the ability of land in a residential area of the city of Bengkulu in adsorbed Alkyl Benzene Sulphonate  (ABS) and Linear Alkyl Benzene Sulphonate (LAS). Soil samples were taken at five-point i.e. the backyard of Balai Buntar,   Fatmawati  Airport, Beringin Raya , Pematang Gubernur and Simpang Nakau  with a drill ground at a depth of 20 cm and cleaned from garbage impurity. Then the soil characterized include moisture content, pH, texture and the organic content  and ABS and ALS adsorbsition measured using UV-vis spectrophotometers att 222-223 nm wavelengths. In this research tested the influence of pH, pulp and optimum contact time contacts from soil sample at in ABS and ALS adsorbsition The adsorbtion pattern is known as the Freundlich and Langmuir parameters. Based on research, generally, it can be concluded that the land in the residential area of Bengkulu city has characteristic average water content – average 23%, pH average – average 5.35 and it's Turn dusty clay. The optimum condition from soil in adsorbs from Alkyl Benzene Sulphonate (ABS) occurs at pH 3, a mass of 1 g and 2 hours of contact time with the adsorption capacity of 0.874 mg/g, while for Linear Alkyl Benzene Sulphonate (LAS)  adsorption  the optimum soil conditions occur at pH 2, mass 0.5 g and 1-hour contact time with the adsorption capacity of 1.607 mg/g.  The pattern of soil adsorption against ABS tends to follow the Langmuir equation whereas against LAS tend to follow the Freundlich equation. Adsorpstion of soil samples in Bengkulu City against ABS belongs to low and adsorpstion against LAS belongs to very low
ANALISIS KEMAMPUAN PENYELESAIAN SOAL KIMIA LEVEL SIMBOLIK SECARA SISTEMATIS PADA MATERI KELARUTAN DAN HASIL KALI KELARUTAN Miming Firdaus; Salastri Rohiat; Hermansyah Amir
ALOTROP Vol 4, No 2 (2020)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v4i2.16697

Abstract

Penelitian ini bertujuan untuk mengetahui kemampuan representasi simbolik siswa kelas XI IPA SMA N 01 Padang Jaya pada materi kelarutan dan hasil kali kelarutan. Metode yang digunakan dalam penelitian adalah deskriptif dengan pendekatan kuantitatif. Sampel penelitian  berjumlah 52 siswa kelas XI IPA SMA N 01 Padang Jaya. Kemampuan representasi simbolik siswa diukur menggunakan tes tertulis berbentuk esai. Teknik analisis data didasarkan pada data yang telah dikumpulkan dari jawaban tes yang diberikan. Berdasarkan hasil analisis data dapat disimpulkan bahwa kemampuan representasi simbolik siswa kelas XI IPA SMA N 01 Padang Jaya pada materi kelarutan dan hasil kali kelarutan masih rendah. Hal ini ditunjukkan dengan rendahnya persentase rata-rata kemampuan representasi simbolik siswa 40% (kategori kurang).
ANTIOXIDANT AND CYTOTOXICITY PROPERTIES OF ETHYL ACETATE FRACTIONS OF Pandanus tectorius FRUIT AGAINST HELA CELL LINES Noor Suryani Musa; Nadia Madiha Ramli; Jasnizat Saidin; Yosie Andriani
ALOTROP Vol 1, No 2 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i2.3515

Abstract

Antioxidant agents play an important role in inhibiting free radical molecules activity thus preventing the cancer disease. This current study aimed to evaluate antioxidant and cytotoxicityproperties of ethyl acetate fractions of Pandanustectorius fruit extract on HeLa cell lines. The radical scavenging activity was measured by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) method. The cytotoxicity was measured by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay against human HeLa cell lines. The result showed that all ethyl acetate fractions of P. tectoriusfruit had high antioxidant property. All of seven fractions of the ethyl acetate extract were observed based on the IC50 value and had high DPPH free radical scavenging activity with the IC50 value range from 0.3 to 2.4 mg/ml compare to positive control,quercetin(IC50= 0.2 mg/ml). Based on the DPPH free radical scavenging activity (antioxidant property), three of seven fractions were chosen for the MTT assay to analyze their cytotoxic activity as anticancer potential agent against HeLa cell lines.From MTT result, one of tree fractions were showed cytotoxicity activity against HeLa cell lines with the IC50value is 12 µg/ml (less than 30 µg/ml), while anothertwo fractions was found not cytotoxic against HeLa cell lines.It is clearly indicated that P. tectoriusfruit has a very good potential as antioxidant and anticancer agent.
Pembuatan Biofuel dari Limbah Cair PMKS dengan Katalis MoCo-HZ Tyas Sri Muryati; Agus Sundaryono; Dewi Handayani
ALOTROP Vol 2, No 2 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i2.7486

Abstract

This research aims to convert vegetable oils contained in Palm Oil Mill waste (PMKS) into biofuels through the cracking process with MoCo-HZ catalyst . PMKS Liquid waste will be prepared with a process of a filtering, degumming, bleaching, warming, and free Fatty Acids determination.  The results obtained are then converted into biofuel with catalytic cracking with use of MoCo-HZ catalyst . Then the cracking products will to test for specified physical characteristics of biofuel eq : acid number , density, viscosity, pour point and cloud point. . The research results showed that the MoCo-HZ catalyst is able to convert vegetable oils contained in the PMKS liquid waste will be cracked into biofuel. Conversion yield obtained is amounting to 48.19%. The physical characteristics of the test results against biofuels produced from the cracking process has not met the standard of comparison from gasoline and kerosene. This is shown by the still high number of biofuel produced acids amounting to 1.72 mg KOH/gr. higher than the numbers of  sour gasoline (0.748 mg KOH/gr) and Kerosene (0.935 mg KOH/gr). The result of the test of density, viscosity, pour point and cloud point against biofuels produced from the cracking process have meet standard compared to gasoline and kerosene respectively 0.807 gr/cm for density, 1.056 cSt viscosity for viscosity , and 0 º C and 1.33 each º C to the freezing point and the cloud point..

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