cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Nadia Amida
Contact Email
nadia.amida@unib.ac.id
Phone
+6273621170
Journal Mail Official
alotrop.fkip@unib.ac.id
Editorial Address
Jl WR Supratman Kandang Limun Bengkulu
Location
Kota bengkulu,
Bengkulu
INDONESIA
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 15 Documents
 1   2 
Search results for , issue "Vol 3, No 1 (2019)" : 15 Documents clear
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
Studi Komparasi Motivasi Belajar Kimia Siswa Kelas X Program Peminatan dan Lintas Minat di MAN 2 Kota Bengkulu Elinge Haster; Salastri Rohiat; Sumpono Sumpono
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9039

Abstract

The purpose of this research was to measure differences chemistry learning motivation of tenth grade students class at major (MIPA) and cross-major (IPS) courses in MAN 2 Bengkulu city. The population in this research is 260 students from 8 classes consisting of four MIPA classes and four IPS classes and also become sample in this research. The type of this research is quantitative descriptive that aims to provide a description of the variables of learning chemistry motivation in the class of major (MIPA) and cross-major (IPS) and emphasize the analysis on data figures obtained by statistical methods. Chemical learning motivation data obtained from the results of a questionnaire motivation to learn chemistry. Questionnaire of motivation to learn chemistry consists of 61 items that validity tested by using SPSS (Statistical Package for the Social Sciences) program to obtain 54 valid items and 7 invalid items and tested reliability with Cronbach's Alpha value of 0.897 and this questionnaire is stated reliable. The research questionnaires were analyzed using normality test, homogeneity test and hypothesis test. The average value of students' learning motivation of major (MIPA) and cross-major (IPS) in chemistry subjects was 197.19 and 189.71 in the good category. The hypothesis testing by using the test T 0.05 at significant level, then it was gained value namely 2.8027 > 1.6508. The results showed that there is a significant difference between major courses and cross-major courses in the chemistry learning motivation of tenth grade students. Motivation to learn chemistry in the major courses better than cross-major courses.
Preparasi dan Karakterisasi Katalis Mo-Ni/HZ dengan Metode Impregnasi untuk Cracking Katalitik Minyak Limbah Cair Pengolahan Kelapa Sawit menjadi Bahan Bakar Nabati Shinta Lestari; Agus Sundaryono; Rina Elvia
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9047

Abstract

This study aims to determine the characteristics of Mo-Ni/HZ catalysts and test the ability of Mo-Ni/HZ catalysts in converting vegetable oils into biofuels through catalytic cracking reactions.Catalyst preparation is carried out by the impregnation method which begins with activation of natural zeolite.Impregnation is carried out by dissolution, reflux, filtration, drying and calcination.Catalyst characterization included the determination of the distribution of metals in zeolites using IR spectroscopic analysis and total acidity of the catalyst by ammonia adsorption gravimetric method.Preparation of samples prior to cracking is heating, degumming and bleaching.Catalytic cracking was carried out at 280oC using Mo-Ni/HZ catalyst for 100 minutes.The constituent components of the cracking results were analyzed by GC-MS and IR spectroscopy.The results obtained from the catalytic cracking process were then determined by physical characteristics which included density, viscosity, fog point and pour point test.Based on the shift of wave number in IR spectroscopy, it can be concluded that the Ni and Mo metals are embedded in the HZ.This Mo-Ni/HZ catalyst has total acidity of 8.39 mmol/gammonia.The results of the study prove that the Mo-Ni/HZ experiment proved to be able to crack oil frompalm oil processing wastewater by 91.46% to composition C=O ester CH aliphatic.The physical characteristics of cracking productshave parameters density of 0.93 g/cm3, a viscosity of 26.60 cSt, a fog point of 15oC and pour point of 11.67oC.
PERBANDINGAN PEMBELAJARAN SAINTIFIK MENGGUNAKAN MODEL KOOPERATIF TIPE STUDENT FASILITATOR AND EXPLAINING (SFE) DAN STUDENT TEAMS ACHIEVEMENT DIVISION (STAD) TERHADAP HASIL BELAJAR KIMIA Florentina Astiani; Amrul Bahar; 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.v3i1.9028

Abstract

This study aims to determine differences in student learning outcomes in chemistry learning using cooperative learning model of Student Facilitator and Explaining (SFE) type and Student Teams Achievement Division (STAD) on the subject of compound nomenclature. This research type is quasi experiment research with population that is class X MIPA in SMAN 9 Kota Bengkulu even semester of academic year 2017/2018 while sample is class X MIPA 2 and class X MIPA 4 obtained from result of normality test and homogeneity test. Student learning outcomes in this study is seen from the difference between pretest and posttest values. Data analysis used were mean value, normality test, homogeneity test and hypothesis test (t test). The average of pretest and posttest difference of the students in the experimental class I (SFE) was obtained 58.70 while in the experimental class II (STAD) obtained the value 54.25. So it can be concluded that student learning outcomes that apply SFE type cooperative model is higher than student learning outcomes that apply STAD type. After testing hypothesis with significant level (? = 0,05), then obtained tcount value> ttable that is 1.782819 > 1.67469. The results showed that there was a significant difference between experimental class I using SFE type cooperative learning model and experiment II class using STAD type.
IDENTIFIKASI PROFIL FITOKIMIA DAN UJI AKTIFITAS ANTIOKSIDAN EKSTRAK DIETIL ETER DAUN SURIAN (Toona sinensis (A.Juss) M.Roem) DENGAN METODE DPPH. Nurhamidah Nurhamidah; Hazli Nurdin; Yunazar Manjang; Abdi Dharma
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9040

Abstract

Surian Toona sinensis (A.Juss) M. Roem is a plant that is widely used by the community in the field of medicine such as fever, diarrhea, blood booster, tonic and others. This study aims to determine the secondary metabolite compounds found in leaf extracts of Toona sinensis and test the antioxidant activity using the 2,2-diphenyl-1- (2,4,6-trinitrophenyl) -hydrazinyl (DPPH) method. Identification of secondary metabolites by alkaloids, terpenoids, steroids, flavonoids, phenolics, saponins, coumarin and carotenoids. Toona sinensis leaf was extracted using methanol as a solvent. The resulting extract was saponified with a KOH solution in methanol. The saponification results were extracted again with diethyl ether solvent. The ether layer obtained was washed with distilled water, then dried with Na2SO4 and evaporated to dry, then tested its antioxidant activity. The identification results show Surian leaves contain all secondary metabolites except alkaloids. The antioxidant activity parameters of the Surian extract (Toona sinensis) are indicated by the% inhibitory and IC50 values. Test results showed diethyl ether extract had moderate category of antioxidant activity with IC50 122, 3752 ?g / mL

Page 2 of 2 | Total Record : 15

 1   2 

Filter by Year

2019 2019


Reset
Filter By Issues
All Issue Vol. 9 No. 2 (2025): Jurnal Penelitian Pendidikan dan Ilmu Kimia Vol. 9 No. 1 (2025): Jurnal Pendidikan dan Ilmu Kimia Vol. 8 No. 2 (2024): Alotrop 2024 Vol. 8 No. 1 (2024): Penelitian Kimia dan Pembelajaran Kimia Vol. 7 No. 2 (2023): Alotrop 2023 Vol. 7 No. 1 (2023): Alotrop 2023 Vol. 6 No. 2 (2022): Pembelajaran Abad 21 Vol 6, No 1 (2022) Vol 5, No 2 (2021) Vol 5, No 1 (2021) Vol 4, No 2 (2020) Vol 4, No 1 (2020) Vol 3, No 2 (2019) Vol 3, No 1 (2019) Vol 2, No 2 (2018) Vol 2, No 1 (2018) Vol 1, No 2 (2017) Vol 1, No 1 (2017) More Issue