Rina Elvia, Rina
University of Bengkulu

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PERBANDINGAN HASIL DAN MINAT BELAJAR KIMIA SISWA KELAS X IPA MENGGUNAKAN MODEL PEMBELAJARAN KOOPERATIF SNOWBALL THROWING DAN TALKING STICK PADA KURIKULUM-2013 DI SMAN 10 KOTABENGKULU Saputri, Rika Juwita; Sumpono, Sumpono; Elvia, Rina
Alotrop Vol 2, No 2 (2018)
Publisher : FKIP University of Bengkulu

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The purpose of this research to determine the difference in learning outcome and interest of students on chemistry learning between class which applied snowball throwing and class which applied talking stick learning model on nomenclatur of  chemical compounds material in curriculum-2013 of  grade X IPA in  SMA Negeri 10 Bengkulu City. Research conducted is a research with the type of quasi experiment. Analysis of the data used are mean values, normality test, homogeneity test, and t-test. Chemistry learning outcome data obtained pretest and posttest value where average improvement value of cognitive learning result for snowball throwing class and talking stick class are 56,970 and 45,606. While the interest of students learning of  both experiment classes procure percentage are 81,567% and 75,373%. The result of t test with significant level (? = 0,05), then got value for tcount   >ttable is 4,734 > 1,669 for learning result and 3,596 > 1,669  for interest learning. The results showed that there were significant differences in learning outcomes and learning interest between classes that applied snowball throwing learning and classes that applied the talking stick learning model.
PREPARASI DAN KARAKTERISASI KATALIS MO-NI/HZ DENGAN METODE IMPREGNASI UNTUK CRACKING KATALITIK MINYAK LIMBAH CAIR PENGOLAHAN KELAPA SAWIT MENJADI BAHAN BAKAR NABATI Lestari, Shinta; Sundaryono, Agus; Elvia, Rina
Alotrop Vol 3, No 1 (2019)
Publisher : FKIP University of Bengkulu

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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 MODEL PEMBELAJARAN KOOPERATIF TIPE STUDENT TEAMS ACHIEVEMENT DIVISION DAN TEAM GAMES TOURNAMENT BERBANTUAN MEDIA KARTU KATION ANION TERHADAP HASIL BELAJAR KIMIA Rosmalara, Anisa; Elvia, Rina; Rohiat, Salastri
Alotrop Vol 3, No 2 (2019)
Publisher : FKIP University of Bengkulu

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This study aims to determine the differences in student chemistry learning outcomes between classes that apply the Student Teams Achievement Division (STAD) learning model with a class that applies the Team Games Tournament (TGT) learning model to chemical compounds. This type of research is quasi-experimental with a population of class X IPA Academic Year 2018/2019 which amounts to 204 students. Samples were obtained from the results of the normality test and homogeneity test, namely class X IPA 4 which applied the STAD learning model with cation anion media and class X IPA 6 which applied the TGT learning model with anion cation card media. This study was conducted in January-March 2019. Analysis of the data used is the average (mean), normality test, homogeneity test, and hypothesis testing (u test). In general, the two models were able to improve learning outcomes, where the STAD learning model obtained higher results, namely 79.723. Data on students' chemistry learning outcomes were obtained from the pretest and posttest values where the average value of the increase in cognitive learning outcomes for the STAD class and the TGT class was 57,222 and 46,944. Through a series of statistical tests hypotheses were tested using the u test with a significant level (? <0.05) indicating the value (Sig. 2-tailed) of 0,000. This shows that there are significant differences in learning outcomes between classes applying the STAD learning model assisted by anion cation cards with classes that apply the TGT learning model assisted by anion cation cards.
PERBANDINGAN HASIL BELAJAR KIMIA SISWA MENGGUNAKAN MODEL PEMBELAJARAN JIGSAW DAN THINK PAIR SHARE (TPS) DENGAN PENDEKATAN SCIENTIFIC PADA KELAS X IPA DI SMAN 3 KOTA BENGKULU TAHUN AJARAN 2018/2019 Pepi, Pepi; Amir, Hermansyah; Elvia, Rina
Alotrop Vol 3, No 2 (2019)
Publisher : FKIP University of Bengkulu

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This study aims to compare the Think Pair Share (TPS) and Jigsaw learning models with the Scientific approach to the results and interest in learning chemistry in the mole concept material in class X MIPA SMAN 3 Kota Bengkulu. This research was carried out in January-April 2019. This type of research was a quasi-experimental study with a population of all classes of X MIPA totaling 180 students. How to obtain samples through normality and homogeneity tests through cluster random sampling technique, where two classes of research samples were obtained, namely Experiment 1 class which applied Think Pair Share (TPS) learning model and experimental class 2 which applied the Jigsaw learning model. Based on the results of the study it was concluded that the two learning models proved to be able to increase students' learning outcomes and interest in chemistry and reach KKM, namely 76 with the acquisition of the N-Gain Score in the Think Pair Share (TPS) learning model of 0.71 and in the Jigsaw learning model of 0, 79 where both values of N-Gain Score have a high category. The results of students' interest in learning chemistry in the experimental class 1 were 75.93% with good categories and the results of the learning interest in the experimental class 2 were 82.01% with very good categories. The results of hypothesis testing through t test on the cognitive aspect sig. (2-tailed) of 0.002 and in the affective aspect of 0,000. It states that there are significant differences in the results and interest in learning chemistry that apply Think Pair Share (TPS) and Jigsaw learning models with the Scientific approach.
PERBANDINGAN HASIL BELAJAR KIMIA SISWA MENGGUNAKAN MODEL PEMBELAJARAN WORD SQUARE DAN MODEL PEMBELAJARAN SCRAMBLE DI MAN 2 KOTA BENGKULU Shintia, Weny; Bahar, Amrul; Elvia, Rina
Alotrop Vol 3, No 1 (2019)
Publisher : FKIP University of Bengkulu

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This study aimed to compare the chemistry learning outcomes of students with using word square model learning and scramble model learning in grade X MAN 2 Kota Bengkulu on the subject of chemistry compound nomenclature. This was quasy experimental research and held in March to May 2018. Population in this study is the entire class X MIA in MAN 2 Kota Bengkulu  2017/2018  academic   year,  amounting  to  149  students.  Sample  is  class  X  MIA  1  and  class  X  MIA  3.        The sample of the research is class X MIA 1 with 32 students and class X MIA 3 with 33 students. Data analysis used normality test, homogeneity test and hypothesis test (t test). Data analysis was performed using Statistical Package for The Social Science (SPSS) version 16.Improvement student?s learning outcomes in this research was taken from difference assess of pretest and posttest. At experiment class of I average value improvement  of student?s learning outcomes was 50.32. while at experiment  class of II, average value improvement of student?s learning outcomes was 44.4 . through some statistic test, there was t-test (? = 0.05) which done test the hypothesis to obtained the test result was t value = 2.174 and t tabel = 1.998. The result of data analysis showed that were significant differences in student learning outcomes between the class which implemented word square model learning and the class which implemented scramble model learning. Student learning outcomes that apply the word square model of learning better than student learning outcomes that apply the scramble model of learning.
ANALISIS KAPASITAS ADSORPSI SILIKA DARI PASIR PANTAI PANJANG BENGKULU TERHADAP PEWARNA RHODAMINE B Madina, Fitri Esa; Elvia, Rina; Candra, I Nyoman
Alotrop Vol 1, No 2 (2017)
Publisher : FKIP University of Bengkulu

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[ANALYSIS OF SILICA ADSORPTION CAPACITY FROM THE SAND OF PANTAI PANJANG BENGKULU  AGAINST RHODAMINE B DYES ] This research was aimed to study the adsorption capacity of synthetic silica on Rhodamine B dyes. Synthetic silica was obtained from the sand of Pantai Panjang  Bengkulu by alkali fusion method using KOH at  360 °C for 4 hours in furnace to obtain potassium silicate crystals (K2SiO3). The crystals were then added 500 mL aqua DM, stirred and sterilized for 24 hours folloed by filtered. The filtrate was dropped with 10 M HCl solution until the pH of filtrate solution reached at 1 to 2 and formed a silent white gel for 24 hours. Moreover,  the gel was filtered with filter paper and washed with aqua DM until pH is neutral and free from KCl, and dried in an oven at 60 °C for 18 hours. The obtained silica powder is then smoothed with mortar and weighed. The adsorbent of Rhodamine B dyes using the synthetic silica powder was performed on pH  variation at 2, 3, 4, 5, 6, and 7 , and  variation of contact time at 10, 20, 30, 40, 50, and 60 min. The results showed that the optimum  condition of adsorption of Rhodamine B by silica from Pantai Panjang sand occured at optimum pH   2 and optimum contact time  20 minutes; with adsorption capacity of 4.95 mg / g and 4.79 mg/g; and with adsorption efficiency of 99.00% and 95.89%.
PENERAPAN KEMOMETRIK PADA METODE CITRA DIGITAL UNTUK ANALISIS ION MERKURI (II) DENGAN INDIKATOR NANOPARTIKEL PERAK Dinata, Angga Aprian; Firdaus, M. Lutfi; Elvia, Rina
Alotrop Vol 3, No 1 (2019)
Publisher : FKIP University of Bengkulu

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Digital image method in quantitative analysis usually uses one of the RGB primary color components (Red, Green, Blue), so that not all digital image data can be extracted. Then needed a method that can render the whole RGB values as variables in quantitative analysis are known as chemometric. This research aims to know the influence of the application of chemometric against the sensitivity of the digital image. Chemometry method used is the Principal Component Regression (PCR) and Partial Least Square (PLS) using Unscramber X software from Camo software, USA.. This method is applied for the quantitative analysis of Mercury (II) ion with silver nanoparticles (NPP) immobilization on filter paper indicator. The research results showed that chemometric has a good influence against the level of the Limit of Detection (LOD) of the digital image, where the level of LOD with chemometric application of the Principal Component Regression (PCR) is 0.4311 ppb, and Partial Least Square (PLS) is  0.4310 ppb smaller than without the application of chemometric Single Linear Regression (SLR) at 0.837 ppb. 
KAPASITAS ADSORPSI ARANG AKTIF CANGKANG BINTARO (CERBERA ODOLLAM) TERHADAP ZAT WARNA SINTETIS REACTIVE RED-120 DAN REACTIVE BLUE-198 Aisyahlika, Siti Zaya; Firdaus, M. Lutfi; Elvia, Rina
Alotrop Vol 2, No 2 (2018)
Publisher : FKIP University of Bengkulu

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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.
PERBANDINGAN MODEL PEMBELAJARAN KOOPERATIF TIPE THINK TALK WRITE (TTW) DAN CREATIVE PROBLEM SOLVING (CPS) TERHADAP MINAT DAN HASIL BELAJAR KIMIA SISWA Pratiwi, Ghea Sefriza; Bahar, Amrul; Elvia, Rina
Alotrop Vol 3, No 2 (2019)
Publisher : FKIP University of Bengkulu

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The purpose of this study is to describe the comparison of Think Talk Write learning models and Creative Problem Solving learning models to the interests and learning outcomes of chemistry in basic chemical law material. This research was conducted in January-May 2019. The research conducted was a kind of quasi-experimental research. The population of this study was class X MIA, totaling 136 students in SMAN 8 Kota Bengkulu in the academic year 2018/2019. Sampling was carried out after the normality and homogeneity test, so the X MIA 2 class was selected using Think Talk Write and X MIA 3 models that used the Creative Problem Solving model with a total of 68. Analysis of the data used was mean, normality test, test homogeneity, interest questionnaire analysis, N-Gain Score test and hypothesis test (t test). In general, both of these learning models are able to increase students 'interest and learning outcomes of chemistry, where the percentage of students' interest in learning chemistry in the Think Talk Write model is 80.5% and categorized as good, for the class of Creative Problem Solving model the percentage is 76.6% and also categorized as good. For the value of N-Gain score on Think Talk Write (TTW) class is and categorized as high while in the Creative Problem Solving class is 0.62 and is categorized as medium. The t-test results on the affective aspects are sig. (2-tailed) of 0.015 and on the cognitive aspect of 0.001. It states that there are significant differences in the interest and learning outcomes of chemistry that apply the Think Talk Write (TTW) learning model and Creative Problem Solving
AKTIVITAS ASAP CAIR CANGKANG BUAH Hevea braziliensis SEBAGAI ANTI BAKTERI Staphylacoccus aureus Agustina, Widiya; Sumpono, Sumpono; Elvia, Rina
Alotrop Vol 1, No 1 (2017)
Publisher : FKIP University of Bengkulu

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The aims of this research is to know the activity of liquid smoke Hevea braziliensis  Seed Shell as antibacterial of Staphylacoccus aureus. The synthesis of  liquid smoke on this research through some process such as pyrolysis, sedimentation, filtration, distillation and redistillation. H.braziliensis Seed Shell liquid smoke  obtained phenol levels 0.84% and pH  2.548. Antibacterial activity tested by hollow difusion methode with variations concentration of liquid smoke .at 5%, , 10 , 25 , 50, 75, and 100 % v/v. The effective concentration H.braziliensis  liquid smoke in inhibiting the growth of S. aureus bacteria is 75% v/v with strong antibacterial level that showed by an inhibition zone at 10,6 mm. On this research One Way ANOVA test showing the Fcount   ? F table, which means there is a significant difference between the diameter of the inhibition zone on various concentrations of H.braziliensis seed shell.iquid smoke..