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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 15 Documents
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Search results for , issue "Vol 2, No 2 (2018)" : 15 Documents clear
POTENSI SITOTOKSIK DAN ANTIBAKTERI EKSTRAK DAUN Laportea interrupta (L.) Chew (JELATANG AYAM) TERHADAP Staphylococcus aureus Okti Mindi Safitri; Nurhamidah Nurhamidah; Hermansyah Amir
ALOTROP Vol 2, No 2 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i2.7492

Abstract

This research aims to determine the profile of phytochemicals, determine the level of cytotoxic extract toward the larva of Artemia salina Leach by using Brine Shrimp Lethality Test (BSLT) method, and to measure how much the activity of  antibacteria leaf ekstract of Laportea Interrupta (L.) Chew  (Jelatang Ayam )  toward the Staphylococcus aureus bacteria. The leaf of L. interrupta  (L.) Chew are dried and grinded well. The half of grinded sample are tested by phytochemical  profile and another one are ekstracted by using etanol liquid for three days then they are evaporated. The result of fitokimia leaf L. interrupta  (L.) Chew test contains secondary metabolite alkaloid,  tanin, terpenoid,  and saponin. The result of cytotoxic extract of leaf L. interrupta  (L.) Chew toward the A. salina Leach is obtained LC50 for 93,33 ppm, so, the L. interrupta  (L.) Chew is toxic because it is in the range of 31 ppm to 1000 ppm and it can be potentially as a anticancer agents. The eksract of Jelatang Ayam leaf can obstruct the growth of S. aureus, on 5 x 104 clear zone concentration that formed 9 mm being medium categorized. The more concentration of the Jelatang leaf ekstract then more its obstruction energy.
PERBEDAAN HASIL PEMBELAJARAN PROBLEM BASED LEARNING (PBL) MENGGUNAKAN MIND MAPPING DAN SUMMARIZES PADA KELAS XI IPA MAN 1 KOTA BENGKULU TAHUN AJARAN 2017/2018 Alfia Novera Indah Esa Kasih; Amrul Bahar; Salastri Rohiat
ALOTROP Vol 2, No 2 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i2.7475

Abstract

This study aims to determine differences in ProblemBased learning (PBL) using mind mapping ( PBL-mind mapping) and summarizes (PBL –summarizes) on the subject of ionic equilibrium in saline solution. The type of research used is quasi experimental research with population class XI IPA in MAN 1 Kota Bengkulu 2017/2018 academic year which amounted to 152 people and samples taken from normal and homogenous population by random sampling technique so that got sample that is class XI IPA 1 (PBL -Mind Mapping) as an experiment 1 with 36 people and class XI IPA 2 (PBL-Summarizes) as an experiment 2 which is 38 people.Data obtained in the form of cognitive domain learning results obtained from test results in the form of pretest and post-test. Data analysis used were mean score, normality test, homogeneity test, and hypothesis / t test with significance value ? = 0.05 calculated with SPSS 16.0 for Windows. Student learning outcomes in this study seen from the value of difference between pretest and post-test values. The average of pretest and post-test difference of experimental class 1 and 2 students were 56.11 and 49.21 and t-test obtained t-count value is greater than t-table (2.088> 1.99).The results of the data show that there are significant differences between the experimental classes 1 and 2 and show that the result of learning PBL using mind mapping is better with KKM achievement of 83.4% than the result of learning PBL using summarizes with KKM exhaust amounted to 68.4%.
KAPASITAS ADSORPSI ARANG AKTIF CANGKANG BINTARO (Cerbera odollam) TERHADAP ZAT WARNA SINTETIS REACTIVE RED-120 DAN REACTIVE BLUE-198 Siti Zaya Aisyahlika; M. Lutfi Firdaus; Rina Elvia
ALOTROP Vol 2, No 2 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i2.7483

Abstract

The objective of this research was to utilize bintaro shell waste (Cerbera odollam). The morphology of bintaro shell is similar with coconut shell and the contains of lignin and cellulose is higher than coconut. Bintaro shell waste used as activated charcoal to remove environmental pollution caused by synthetic dyes waste of batik industry. The adsorbents were then applied to remove of Reactive Red-120 (RR) and Reactive Blue-198 (RB) dyes in aqueous solution using Visible Spectrophotometer analysis method. Bintaro shell was dried, cut and carbonized at 400°C for 1 hour, then activated with ZnCl2 20% for 24 hours at 27°C and dryed in oven at 105°C for 30 minutes. The activated charcoal of bintaro shell has proven afford to adsorbing RR and RB dyes. The optimum conditions (pH, contact time, adsorbent weight and temperature) were determined to obtain best adsorption capacity. The optimum of conditions for RR occured at pH 2, contact time of 40 minutes and adsorbent weight 100 mg while RB occurred at pH 11, contact time of 60 minutes and adsorbent weight 50 mg and with each the temperature 30°C. At optimum conditions the adsorption isotherm followed Freundlich model with maximum adsorption capacity obtained for RR and RB were 332.6 and 243.9 mg/g, respectively.
PENERAPAN MODEL PEMBELAJARAN PROBLEM BASED INSTRUCTION (PBI)DENGAN MENGGUNAKAN MEDIA AUDIO-VISUAL UNTUK MENINGKATKAN AKTIVITAS BELAJARDAN HASIL BELAJAR SISWA DI SMA N09 KOTA BENGKULU Isna Mutaqwiyati; Nurhamidah Nurhamidah; Hermansyah Amir
ALOTROP Vol 2, No 2 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i2.7558

Abstract

This research was aimed to find out the student’s improvement of  learning activity and learning outcome as the implementation of  Problem Based Instruction (PBI) by using audio-visual media. The subject of this research was the students at grade X MIPA 3 of SMA N 09 Bengkulu Ciyty academic year of 2017/2018 which consisted of 27 students, on the subject of of chemistry’s basic laws and stoichiometry. This research was conducted by the researcher by using three cycles which consisted of four steps; planning, action, observation and reflection. The data collections were tests and non tests which consisted of post test and student’s learning activity observation sheets. The data of this research was analyzed by using simple quantitative data analysis;   the student’s average score, the percentage of classical absorption and the percentage of classical learning mastery.   Based on the result of this research can be concluded that the implementation of   PBI by using audio-visual media improved student’s learning activity and learning outcomes in each cycle and achieved the clasical learning outcomes in cycle III. The improvements of student’s average score was; score 23 (Fair) of cycle I; score 26,33 (good) of cycle II; and score 28,66 (good) cycle III. The average score of teacher observation sheets of each cycles were; 25,66 fpr the first cycle (good), 28 for the second cycle (good), and 29,66 in the last cycle (good). There  was also  improvements of the students’ percentage of classical learning mastery from in cycle I 51,85%, to 66,66% in cycle II and 85,15% in cycle III.
BIOSORPSI ION LOGAM BERAT Cu(II) DAN Cr(VI) MENGGUNAKAN BIOSORBEN KULIT KOPI TERXANTHASI Renaldi Adriansyah; Elyn Novta Restiasih; Nessi Meileza
ALOTROP Vol 2, No 2 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i2.7478

Abstract

There are several methods that have been used to remove and reduce the contamination of heavy metal ions.Among theseveral methods, biosorpsi is a cheap and high efficiency method. One of the organic materials that have potential to become heavy metal ion biosorbent was coffee skin.However, to improve the performance of coffee skin in adsorption of  heavy metal ions Cu (II) and Cr (VI) then biosorbent need to be modified through xanthation process.This xanthation process carried out by reacting the coffee skin with carbon disulfide compounds in an alkaline condition.This study aims to determine the ability of xanthated  coffe  skin biosorbentin adsorption of  Cu (II) and Cr (VI) metal ions and to know the optimum condition of the metal ion adsorption process byxanthated  coffe  skin biosorbent. From this research we got the optimum mass of Cu (II) and Cr (VI) metal ion adsorption of 0.45 and 0.6 gram. The optimum pH of Cu(II) and Cr(VI) metal ions adsorption occurs at pH 4.While the optimum contact time occurs at 100 minutes for Cu (II )metal ion adsorption  and 80 minutes for Cr (VI) metal ion adsorption. In addition, the maximum biosorption capacity of xanthated coffeskin biosorbent in adsorption of Cu (II) and Cr(VI) metal ions respectively 62.5 mg/g and 8.064 mg/g.  So it can be concluded that xanthated  coffe  skin biosorbenthave a better ability to adsorb Cu (II) metal ions than Cr (VI) metal ions.
PENERAPAN MODEL PEMBELAJARAN KOOPERATIF TIPE COURSE REVIEW HORAY(CRH) UNTUK MENINGKATKAN MOTIVASI DAN HASIL BELAJAR KIMIA SISWA SMA N 1 KOTA BENGKULU 1Nurul Zulhulaifah; Nurhamidah Nurhamidah; Elvinawati Elvinawati
ALOTROP Vol 2, No 2 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i2.7484

Abstract

This study is a classroom action research applying the Course Review Horay learning model on the subject of basic chemical laws and chemical reaction equations in three cycles with four stages: planning, implementation, observation and reflection on each cycle aimed at improving motivation, activity and results learning chemistry of students of class X IPA 5 SMA N 1 Kota Bengkulu academic year 2017/2018. The study was conducted in March-April of 2018 with a total of 27 students, consisting of 17 women and 10 men. The data were obtained using questionnaire of motivation, posttest and observation sheet of teacher and student activity, which was processed using simple quantitative analysis technique, mean score of motivation questionnaire and observation sheet, percentage of classical absorption and classical learning completeness. From the results of this study it can be concluded that the application of CRH learning model proved able to increase the students' motivation, activity and chemistry learning achievement to reach the minimum mastery criteria of ?75 in the third cycle. Student learning motivation increased every cycle from pre cycle up to cycle III 35,69% (low), 38,95% (low), 59,71% (medium) and 78,96% (high) respectively. The activities of teachers and students also increased each cycle in a row: teacher activity scores: 36, 38 and 38.5 with good category and student activity score: 29 (enough), 37,5 and 38 with good category. Student learning outcomes in cycle I obtained an average value of 54.3; 54.3% classical absorption and 16% classical learning completeness. In cycle II, the average score is 72.5; 72.5% classical absorption and 57.69% classical learning completeness. In cycle III, the average score is 78.76; 78.76% classical absorption and 84.61% classical learning completeness
ANALISIS ION MERKURI (II) MENGGUNAKAN NANO PARTIKEL PERAK TERIMOBILISASI PADA KERTAS SARING Nessi Meileza; M. Lutfi Firdaus; Elvinawati Elvinawati
ALOTROP Vol 2, No 2 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i2.7559

Abstract

The aims of this research is improve stability and sensitivity of silver nanoparticles (NPP) immobilizatied on filter paper. Silver nanoparticles synthesized by reducing the ascorbic acid using a chemical reduction method. Immobilization NPP on filter paper is done with the technique of immobilization (immunosystem) is the process of molecular bonding reagent in supporting materials, so physically bound NPP the surface of filter paper is composed of cellulose fibers. The results obtained for the stability of immobilization NPP on filter paper can be last up to stable 60-daywhile liquid NPP stability can only last for 30 days. To maintained the stability ofimmobilization on filter paper is saved in a closed box. For the determination of sensitivity of immobilization NPP in the filter paper test is performed against the mercury (II) ion with each different concentrations. The results obtained for sensitivity of immobilization NPP on the filter paper is analyzed in digital image can be detect mercury (II) ion until the concentration of ppb. The results of measurement Limit of Detection (LOD) or limit the smallest NPP can detect mercury (II) ion is under 0.863 ppb, while liquid NPP able to detect only concentration 1.448 ppb.. The results of this research NPP immobilization on filter paper can be an alternative to increasingstability and sensitivity of NPP compared with liquid  NPP, and can be applied into the colourimetry indicator is inexpensive and practical to analysis of mercury (II) ion in the digital image.
PERBANDINGANHASIL BELAJAR SISWA MENGGUNAKAN MODEL PEMBELAJARAN KOOPERATIF TIPE MAKE A MATCH (MM) DANTEAM GAMES TOURNAMENT (TGT) PADA MATA PELAJARAN KIMIA DI KELAS X IPA MAN 1 KOTA BENGKULU Nova Syofiana; Salastri Rohiat; Hermansyah Amir
ALOTROP Vol 2, No 2 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i2.7479

Abstract

This study aimed to determine differences in students’learning outcomes using cooperative learning model with Make A match and Team Games Tournament on chemistry subject of X IPA in MAN 1 Kota Bengkulu.A quasi-experimental (quasi experiment) was used as research model.Population of this research was all of  X IPA students which was137 students,then,there were 74 students as sample of this research taken from two classes, X IPA1 and X IPA 3.The techniques in data analysis used mean value,questionnaire analysis,normality test,homogeneity test,and t-test with significant ? = 0,05.The data collecting technique was done by usinga SPSS16 program for windows.The data on students learning outcomes were seen by differences between pre-test and post-test.Experiment 1class had 47.44  as the average of the differences and Experiment 2 class had43.79 as the average of the differences.The result showed that the students learning outcomes were influenced by learning motivation.Additionally,the data of students learning outcomes in both classes obtained from the learning motivation percentage which were 83,84% categorized as very good and 7,49% as good.From the resultof this study,it could be concluded that, generally,either the learning outcomes or students learning motivation in applying cooperative learning model,TGT type is higher than MM type.It showed that t count > t table,where 1.7515 > 1.6662 forlearning outcomes and 8.9804 > 1.6662 for students learning motivation.In the sameway,there is a significant difference between learning outcomes and students learning motivation by applying cooperative learning model in two types,namely Make A Match (MM) and Team Games Tournament (TGT). 
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..
PERBANDINGAN HASIL BELAJAR MENGGUNAKAN MODEL PEMBELAJARAN KOOPERATIF TIPE STAD DAN CRH PADA MATERI HIDROLISIS GARAM Nadia Amida; Andromeda Andromeda; Bahrizal Bahrizal
ALOTROP Vol 2, No 2 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i2.7560

Abstract

Lesson about  hydrolysis  requires students to understand the concepts hydrolyzed from  type of salt which is then applied in the calculation. In  learning process, students direct involvement is necessary, so that it is used a method that can increase the activity of students. Student Teams Achievement Division (STAD) cooperative learning and Course Review Horey (CRH) expected to create learning that has caharacterized as student centered.  This research aims to reveal students' learning outcomes using STAD cooperative learning and CRH on the hydrolisis material in class XI SMAN 8 Padang. This type of research is experimental research using a randomized study design Control Group Posttest-Only Design is expanded. The study population was a class XI IPA SMAN 8 Padang. Giving  a test at the end of the study as many as 25 pieces of matter objectively. Results of tests of normality and homogeneity of the two classes that both classes of samples obtained samples were normally distributed and had homogeneous variance. After being tested on a real level t = 0.05 with degrees of freedom (df) of 59 obtained t of 2.53 while t table of 1.67. From the research shows that the learning outcomes of students with STAD cooperative learning model is significantly higher than the results of student learning with cooperative learning model CRH hydrolysis of salts in the material in class XI of SMAN 8 Padang.

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