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All Journal Chemica: Jurnal Ilmiah Kimia dan Pendidikan Kimia Seminar Nasional Hasil Penelitian LP2M UNM Chemedu: Jurnal Ilmiah Pendidikan Kimia
Sumiati Side
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Kapasitas Adsorpsi Tanah Diatomeae (Diatomaceous earth) terhadap Ion Kromium (VI) Rahmah ,; ; Ramlawati; Sumiati Side
Chemica: Jurnal Ilmiah Kimia dan Pendidikan Kimia Vol 12, No 1 (2011)
Publisher : Jurusan Kimia FMIPA UNM

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (181.157 KB) | DOI: 10.35580/chemica.v12i1.201

Abstract

ABSTRAKPenelitian bertujuan untuk menentukan kapasitas adsorpsi tanah diatomeae terhadap ion kromium (VI). objek penelitian adalah tanah diatomeae yang diambil dari laboratorium teknik kimia UGM Yogyakarta. Tanah diatomeae kemudian diaktivasi secara fisika pada suhu 350oC selama 3 jam di dalam tanur. Tanah Diatomeae dianalisis daya serapnya dengan mencari waktu kontak optimum dengan variasi waktu kontak 1, 2, 4, 6 dan 12 jam. Setelah itu, menentukan daya serap tanah diatomeae pada berbagai konsentrasi, yakni 10, 20, 30, 40 dan 50 ppm dan kapasitas adsorpsinya. Penentuan ion kromium (VI) yang teradsorpsi oleh tanah diatomeae dilakukan dengan metode titrasi iodometri dengan menghitung selisih konsentrasi ion kromium (VI) sebelum dan sesudah adsorpsi. Penentuan kapasistas adsorbsi menggunakan pola isoterm adsorbsi yang sesuai. Hasil penelitian menunjukkan bahwa waktu kontak yang optimum adalah 2 jam, kapasistas adsorpsinya sebesar 6,452 g/L dan mengikuti pola isoterm adsorpsi Freundlich dengan nilai R­­­2 = 0,8550. Kata kunci: ion kromium (VI), tanah diatomeae, kapasitas adsorpsi ABSTRACT This study aimed to determine the adsorption capacity of diatomae towards chromium VI ion. The object was taken from chemical engineering laboratory UGM Yogyakarta. Diatomeaes was physicall activated 350oC for 3 hours in furnace. Absorption potence determined by finding the optimum contact time with a variation of the contact time 1, 2, 4, 6 and 12 hours. Also to determine the absorption of diatomeaes at various concentrations; 10, 20, 30, 40 and 50 ppm and then determine the adsorption capacity. Cumulatif chromium (VI) ion adsorbed by diatomeaes performed by iodometric titration method, calculating the difference ion concentration of chromium (VI) before and after adsorption. Determination of adsorption Capacity using appropriate isotherms adsorption pattern and is obtained the optimum contact time was 2 hours, Capacity adsorption 6.452 g/L and follow the Freundlich adsorption isotherm type with R2 value is 0.8550. Key words: chromium (VI), diatomeae soil, adsorption capacity
Pengaruh stabilisator polivinil alkohol terhadap ukuran nanopartikel perak hasil sintesis dengan metode reduksi Sumiati Side; Diana Eka Pratiwi
Seminar Nasional LP2M UNM Prosiding Edisi 2
Publisher : Seminar Nasional LP2M UNM

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Abstract

Silver nanoparticles were synthesized by an environmentally friendly chemical reduction method using Moringa olifera plant extract as reducing agent for the AgNO3 precursor.. The synthesis of silver nanoparticles was carried out without and with the addition of PVA. The formation of silver nanoparticles was monitored by observing UV-Vis absorption. The results showed that the synthesis of silver nanoparticles with the addition of 1% PVA  gave smaller particle size than without addition of PVA. Stirring speeds up the process of forming silver nanoparticles. Maximum absorption of UV-Vis from silver nanoparticles colloid with addition 1% PVA and without addition of PVA at wavelengths of 475 nm and 476 nm respectively in 240 minutes of storage. The purity of the silver nanoparticles synthesized was determined using the XRF instrument and the silver metal content in the synthesized powder was 89.95% with the addition of 1% PVA and 46.23% without the addition of PVA. The size distribution and nanoparticle phase were analyzed using XRD instruments and obtained the average size of the silver nanoparticles synthesized by 24.08 nm with addition of 1% PVA and 32.00 nm without addition of PVA, and both having a face centered cubic (fcc) geometry.
Pengembangan instrumen penilaian praktikum kimia fisik berbasis Keterampilan Generik Sains (KGS) yang valid, praktis dan efisien Hardin Hardin; Sumiati Side
Seminar Nasional LP2M UNM Prosiding Edisi 1
Publisher : Seminar Nasional LP2M UNM

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Abstract

This research is a development research focused on developing assessment instruments for Physical Chemistry based on generic science practicum (KGS) which include the development of pre-practicum assessment instruments, practicum assessment instruments, practicum report assessment instruments and affective assessment instruments. This study aims to obtain a valid effective and practical KGS-based practicum assessment tool. The research achieved through the activity plan stages includes: (1) theoretical studies, (2) preparation of assessment instruments, (3) validation of assessment instruments and (4) trial of assessment instruments. The KGS-based assessment tool developed was validated by two experts and then revised so that a valid device was obtained. Limited testing and implementation was carried out in the Department of Chemistry, FMIPA, Makassar State University with 60 students. The results showed that the assessment instruments developed after validated validation performed with the validation coefficients of the contents of each device were: pre-practicum assessment instruments, practical process assessment instruments, report assessment instruments, and affective assessment instruments with coefficient values, respectively validation of contents 1.00, 0.88, 1.00, 0.88. The assessment instrument was declared practical because most aspects were responded positively by the assistant. The assessment instrument is declared effective because it has met the effectiveness criteria, with the results: The overall score of the practitioner is in a very good category, Assistant activities and activities are fulfilled.
Pengaruh Macromedia Flash dalam Model Pembelajaran Kooperatif Tipe Numbered Heads Together (NHT) terhadap Hasil Belajar Siswa Kelas X SMAN 12 Makassar (Studi pada Materi Pokok Ikatan Kimia) Yanti Madong; Taty Sulastri; Sumiati Side
ChemEdu Vol 1, No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35580/chemedu.v1i1.17525

Abstract

The research is quasi experiment that aim to know the influence of using Macromedia Flash on cooperatif learning model type NHT to achievment of students of class X SMA Negeri 12 Makassar. The independent variable are NHT type cooperatif learning model with Macromedia Flash and without Macromedia Flash based in cooperatif learning model, and dependent variable is students’ achievment in chemical bonding main subject of learning. The populasi is whole student of X Grade SMAN 12 Makassar which consists of 8 classes. The sample include two classes such as X2 as an experiment class with 36 students and X3 class as a control class with 36 students The sampling technique is random with assumption that the population is homogeny. Data collection technique is obtained from objective test which consists of 20 items of multiple choice. The data analysis technique used are descriptive statistical analysis and inferential statistical analysis. The hypothesis test using t test shows that tcalculate > ttable = 2,97 > 1,67 on α ═ 0,05. Conclude that using Macromedia Flash on Cooperatif Learning Model Type NHT gives effected positive to toward student’s achievement of class X SMAN 12 Makassar on Chemical Bonding subject matter.
Pengaruh Teknik Mencatat Mind Mapping pada Model Pembelajaran Learning Cycle 5E Terhadap Hasil Belajar Peserta didik Kelas X SMA Negeri 1 Kajuara Kabupaten Bone Wardah Sari; Sumiati Side; Muhammad Anwar
ChemEdu Vol 1, No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35580/chemedu.v1i1.17524

Abstract

The research was a quasi-experimental that aimed to know the positive effect of using mind mapping method on learning cycle 5E models towards student achievement at class X Senior High School 1 Kajuara. The population in experiment was class X Senior High School 1 Kajuara Bone Regency are 9 Class with 320 peoples, the sample of this research consisted of two classes, namely class X1 as a experiment class with the number of students was 28 and class X4 as a control class with the number of students 30 peoples. The independent variable in this research was using mind mapping noted technique on learning cycle 5E models and without mind mapping noted technique on learning cycle 5E models, the dependent variable was learning achievement on subject matter Chemical Bond. Data which get form descriptive and inferential analysis. From analysis get the average value of experiment class is 71 with deviation standard is 9.35 while in control class the average is 65.30 with deviation standard is 10.14 and the percentage in class experiment is 57.14% while control class is 30%. The result of hypothesis analysis use t-test got tcalculate = 2.21 and significant level α = 0,05 with dk = 56 got ttable = 1,66. So that, tcalculated > ttable, so H1 accepted and H0 rejected. It means that mind mapping noted technique on learning cycle 5E model has effect toward student achievement class X Senior High School 1 Kajuara Bone Regency in chemical bond matter.
Pengembangan Model Pembelajaran Inquiri Dinterferensi Pendekatan Scientific untuk Meningkatkan Keterampilan Berpikir Ilmiah Siswa SMA Jusniar Jusniar; Sumiati Side
ChemEdu Vol 1, No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35580/chemedu.v1i1.17528

Abstract

The main objectives to be achieved from this research is to produce books Scientific learning model - Enquiry and supporting devices such as lesson plans, worksheets and valid assessment tools, practical and effective in improving students' scientific thinking skills. Instructional material used as the focus of this research is the solution of electrolyte and non-electrolyte that is presented in class X semester. Activity presents a real problem in the class is the first step of learning, so it is expected that students are able to analyze problems, hypothesize, collect the data and concluded through experimentation. This is not apart of the activities 5 M (Observe, ask, reasoning, Tried and Communicate) which is the scientific thinking activities of students. The development method used is Plomp (1997), which consists of four stages, namely; 1) The initial assessment by observation early in the school curriculum, the students and the state sylaby appropriate learning model; 2) planning draft of the model scientific - inquiry and materials suitable for development, 3) realization & Construction to develop the book model of scientific - inquiry together with learning devices namely lesson plans, worksheets and assessment tools skills of scientific thinking of students, while stage 4) implementation has not been done for I. year study the validity of test results from three experts to book models and devices obtained by each (book model = 3.23; RPP = 3.29; LKS = 3.19 and assessment tools = 3.10) total mean with a 3.20 average coefficient of expert judment index equal to one category is valid. Test the practicality of the model and the Scientific - Inquiry through perception questionnaires gained an average of 89.47% of students (32 students) who respond positively to the application of models and tools, and of the three chemistry teacher at SMAN 1 Bajeng average of 90.05% giving a positive response to the model and the device. Test the effectiveness evident from the test results show class completeness of 81.25% (26 students completed). Feasibility study can be seen from the observation of student activity associated with formulating problems, observe, ask questions, give argimen, formulate hypotheses, collect and data analyze, discuss, cooperation and conclude group average of 75.83%. Based on these two indicators show that the model and the device is effective to improve learning outcomes and scientific thinking skills.
Co-Authors ; Ramlawati Diana Eka Pratiwi hardin hardin Jusniar Jusniar MUHAMMAD ANWAR Rahmah , Taty Sulastri Wardah Sari Yanti Madong