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All Journal Jurnal Pendidikan dan Pemberdayaan Masyarakat Alotrop Jurnal Pendidikan dan Ilmu Kimia PENDIPA Journal of Science Education Jurnal Teknodik Hydrogen: Jurnal Kependidikan Kimia TRIBUTE: JOURNAL OF COMMUNITY SERVICES
Rina Elvia
FKIP Universitas Bengkulu
Humanities Chemistry Computer Science & IT Education Languange, Linguistic, Communication & Media Mathematics Social Sciences

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Journal : Alotrop Jurnal Pendidikan dan Ilmu Kimia

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PENGEMBANGAN INSTRUMEN ASESMEN KOGNITIF BERBASIS KETERAMPILAN BERPIKIR KRITIS PADA MATERI ASAM BASA DI SMA NEGERI 3 BENGKULU TENGAH Rovi Atahilah; Rina Elvia; Febrian Solikhin
ALOTROP Vol 6, No 1 (2022)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/alo.v6i1.21753

Abstract

This study aims to develop a cognitive instrument based on critical thinking skills on acid-base material based on needs analysis in schools. This type of research is research and development with the ADDIE model, where researchers only carry out until the implementation stage. The sample of this research is class XI IPA 1 opening 29 people. The sampling technique used was purposive sampling. Data analysis using item validation test and reliability test using Lawshe theory and Rasch model as well as testing students' critical thinking skills. The results of developing the Critical Thinking instrument show that it is valid and has a very high reliable value. Valid questions from validation are 18 questions from 24 questions developed, valid questions from empirical validation 8 questions from the expert validation stage. The results of the trial for critical thinking obtained 3.4% very critical, namely 1 critical person, 51.7% critical, namely 15 students, 37.9% critical, namely 11 students and 7% less critical, namely 2. Average value of thinking skills The overall critical score of students is 62.2% which is in the critical category. For results based on Ennis' critical thinking indicators, 76.6% of questions focus indicators are included in the critical category, 59.3% of indicators determine a source including the critical enough category, critical indicators analyze arguments 66.2% are included in the critical category, indicators define terms and considering a definition 52.4% is included in the quite critical category, the ID indicator assumptions 69.7% is included in the critical category, the indicator observes and considers the observation results 52.4% is included in the quite critical category, the indicator answers challenges 61.4% includes critical category, and indicators make and determine the results of the consideration 59.3% including quite critical category.
PENGARUH PEMANFAATAN MEDIA PRESENTASI ONLINE PREZI PADA MATERI KONSEP MOL TERHADAP HASIL BELAJAR SISWA (Studi Eksperimen di Kelas X MIPA SMAN 9 Bengkulu Utara) Ahmad Fadli Zil Ikram; Rina Elvia; Dewi Handayani
ALOTROP Vol 5, No 1 (2021)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v5i1.16488

Abstract

Penelitian ini bertujuan mengetahui pengaruh pemanfaatan media presentasi online Prezi pada materi konsep mol terhadap hasil belajar siswa Kelas X MIPA SMA N 9 Bengkulu Utara Tahun Ajaran 2018/2019. Jenis penelitian ini adalah kuasi eksperimen. Data berupa N-Gain Score, lembar observasi guru, angket respon siswa. Analisis data menggunakan rata-rata, uji normalitas, uji homogenitas, dan uji hipotesis (uji t). Data hasil belajar siswa diperoleh dari nilai pretest dan posttest dengan rata-rata 34,636 dan 71,545 untuk kelas eksperimen sedangkan pada kelas kontrol 27,407 dan 61,407. Pemanfaatan media online Prezi mendapat nilai N-Gain Score sebesar 0,587 diperoleh dari rata-rata pretest dan posttest. Hasil observasi guru kimia pembelajaran berlangsung dengan baik dengan skor total 20. Respon siswa dari angket berisi 10 pernyataan sangat positif dengan persentase 81,93%. Berdasarkan hasil uji hipotesis (Uji t) dengan taraf signifikansi < 0,05 didapat nilai 0,000423. Hal ini menunjukkan bahwa pembelajaran kimia yang menggunakan media presentasi online Prezi dengan pendekatan saintifik lebih baik daripada pembelajaran konvensional.
SINTESIS SILIKA-KITOSAN UNTUK MENURUNKAN KADAR ION BESI DALAM AIR PERMUKAAN Rangga Putra; Rina Elvia; Hermansyah Amir
ALOTROP Vol 6, No 1 (2022)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v6i1.20318

Abstract

Penelitian ini bertujuan untuk sistesis silika dari abu sekam padi (Oryza sativa) yang dimofikasi dengan kitosan dan hasilnya diaplikasikan untuk menurunkan kadar ion besi dalam air permukaan, terutama air sumur. Metode yang digunakan adalah metode alkali fusion dengan perbandingan abu dengan KOH sebesar 20:80 % berat total. Hasil penelitian menunjukkan modifikasi antara silika dan kitosan berhasil dilakukan serta kemampuan adsorpsi silika yang dimodifikasi lebih baik dibanding silika biasa. Uji FTIR menunjukkan telah terjadi modifikasi silika dengan kitosan pada rasio silika-kitosan 2:1 dan 2:2. Pada rasio silika-kitosan 2:1 adanya gugus NH pada bilangan gelombang 1559,61 cm-1,sedangkan pada rasio silika-kitosan 2:2 adanya gugus NH pada bilangan gelombang 1556,93 cm-1.Kondisi optimum adsorpsi logam Fe berada pada pH 5, waktu kontak optimum selama 50 menit dengan suhu adsorbat pada suhu 28°C, dan berat optimum pada rasio silika-kitosan 2:0 sebanyak 150 mg dan pada rasio silika-kitosan 2:1 sebanyak 200 mg. Adsorpsi logam Fe pada kondisi optimum pada rasio silika-kitosan 2:1 lebih tinggi dibanding rasio silika-kitosan 2:0. Pada sampel air sumur dengan kondisi optimum, Konsentrasi adsorpsi logam Fe pada  rasio silika-kitosan 2:1 sebesar 0,742 ppm denganefisiensi adsorpsi 64,838% dan adsorpsi rasio silika-kitosan 2:0 sebesar 0,577 ppmdenganefisiensi adsorpsi 89,776%.
SINTESIS DAN KARAKTERISASI XEROGEL HASIL KOPRESIPITASI DARI PASIR PANTAI PANJANG BENGKULU Finni Meyori; Rina Elvia; I Nyoman Candra
ALOTROP Vol 2, No 1 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i1.4646

Abstract

[SYNTHESIS AND CHARACTERIZATION OF XEROGEL RESULTS OF COPRECIPITATION OF LONG BEACH BENGKULU BEACH].  This research aims to synthesize and characterization to  Xerogel which synthesizes from Pantai Panjang  sands Bengkulu. The method used for this study to synthesizes Xerogel is to use the coprecipitation method. Qualitative XRF test against raw sand  materials that were used show that the content of the element is the most significant element of Si. The first  stages of the synthesis of Xerogel is a purification of the sand sample..  Xerogel synthesis is carried out in two phases, namely the manufacture of aqueous solutions of Sodium Silicate and continued with the formation of a gel. The production of Sodium Silicate solution is done using the NaOH concentration at 5, 6 and 7 M.  Gel formation process is done by adding a solution of HCl 10 M into the solution of Sodium Silicate, followed by process of filtration, washing and drying in the oven. The results showed that the optimum conditions of synthesis of Xerogel   obtained  using 6 M NaOH  , with a yield obtained is amounting at 0.8%. The results of the test by XRD shows that the silica crystal structure  on Xerogel  are amorphous-shaped. SEM-EDS test results show that the acquired  Xerogel on research has a smooth texture and size is not homogeneous with the highest content of elements are the elements Si and O.  PSA test shows that particle size in Xerogel an average at 191.4 nm. 
PERBANDINGAN MODEL PEMBELAJARAN KOOPERATIF TIPE THINK TALK WRITE (TTW) DAN CREATIVE PROBLEM SOLVING (CPS) TERHADAP MINAT DAN HASIL BELAJAR KIMIA SISWA Ghea Sefriza Pratiwi; Amrul Bahar; Rina Elvia
ALOTROP Vol 3, No 2 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i2.10497

Abstract

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
PERBANDINGAN MODEL PEMBELAJARAN KOOPERATIF TIPE NUMBER HEAD TOGETHER (NHT) DAN TIPE JIGSAW TERHADAP HASIL BELAJAR KIMIA SISWA DI SMA NEGERI 6 KOTA BENGKULU Intan Fadila; Hermansyah Amir; Rina Elvia
ALOTROP Vol 4, No 2 (2020)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v4i2.16694

Abstract

ANALISIS KAPASITAS ADSORPSI SILIKA DARI PASIR PANTAI PANJANG BENGKULU TERHADAP PEWARNA RHODAMINE B Fitri Esa Madina; Rina Elvia; I Nyoman Candra
ALOTROP Vol 1, No 2 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i2.3510

Abstract

[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%.
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 KEMOMETRIK PADA METODE CITRA DIGITAL UNTUK ANALISIS ION MERKURI (II) DENGAN INDIKATOR NANOPARTIKEL PERAK Angga Aprian Dinata; M. Lutfi Firdaus; 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.v3i1.9049

Abstract

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. 
PENGEMBANGAN ALAT EVALUASI PEMBELAJARAN KIMIA BERBASIS KOMPUTER MENGGUNAKAN WONDERSHARE QUIZ CREATOR PADA MATERI LARUTAN PENYANGGA Areski Febriani; Rina Elvia; Dewi Handayani
ALOTROP Vol 5, No 2 (2021)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v5i2.17141

Abstract

Co-Authors Ahmad Fadli Zil Ikram Amrul Bahar Angga Aprian Dinata Anisa Rosmalara Areski Febriani Budiyanto Budiyanto Chrisnia Nurbaiti Citra Dwi Palenti Desy Purnama Sari Dewi Handayani Elfrida Napitupuluh Elvinawati Elvinawati Febrian Solikhin Fepri Effendi Finni Meyori Fitri Esa Madina Ghea Sefriza Pratiwi Hendry Nordan Hermansyah Amir I Nyoman Candra I Nyoman Chandra Intan Fadila M. Lutfi Firdaus Mantiko Parbo Maulana Maya Riski Andraini Mia Maysella Aditia Muzanip Alperi Nadia Amida Nurhamidah Nurhamidah Nurhamidah Nurlia Latifah Pangesti Dewi Pepi Pepi Rangga Putra Rika Juwita Saputri Rita Handayanti Rizki Karimullah Rovi Atahilah Salastri Rohiat Salastri Rohiat Shiba Meike Indira Shinta Lestari Siti Zaya Aisyahlika Sumpono Sumpono Sura Menda Ginting Weny Shintia Yola Dewi Putri