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Ulianas, Alizar
Universitas Negeri Padang
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences Transportation Other

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PENGARUH PENAMBAHAN KARAGENAN TERHADAP KUAT TARIK DAN BIODEGRADASI EDIBLE FILM DARI PATI KULIT SINGKONG Christina Lydia Makmur; Indang Dewata; Alizar Alizar; Budhi Oktavia
Jurnal Kependudukan dan Pembangunan Lingkungan Vol 2 No 2 (2021): Jurnal Kependudukan dan Pembangunan Lingkungan (JKPL)
Publisher : Universitas Negeri Padang

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Abstract

Edible film is a thin plastic with a thickness of less than 0.25 mm which serves to protect food products. This study aims to determine the effect of adding carrageenan to edible films made from cassava peel starch (Manihot utilissima) on the mechanical properties and biodegradation of edible films. This experimental study varied the addition of carrageenan with various concentrations of 0%, 0.5%, 1%, 1.5%, 2%. In this edible film, data obtained that the addition of carrageenan affects the tensile strength and biodegradation of the edible film. The maximum tensile strength was obtained by adding 18.54 MPa of carrageenan. Biodegradation of edible film is increasing along with the addition of carrageenan. The mechanical properties obtained in this study have met the standard of JIS Z1707 edible film.
HUBUNGAN PERSEPSI SISWA TENTANG PENGELOLAAN KELAS OLEH GURU DENGAN HASIL BELAJAR KIMIA KELAS XI SMA Winda Annisa Suryanti; Alizar Ulianas
Ranah Research : Journal of Multidisciplinary Research and Development Vol. 1 No. 4 (2019): Ranah Research : Journal Of Multidisciplinary Research and Development (August
Publisher : Dinasti Research

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Abstract

Telah dilakukan penelitian tentang hubungan antara persepsi siswa tentang pengelolaan kelas oleh guru terhadap hasill belajar kimia kelas XI SMA. Jenis penelitian yang dilakukan ialah deskriptif dengan metode kuantitatif yang bersifat korelasional. Sebanyak 62 orang siswa dijadikan sampel dalam penelitian ini, diambil dengan teknik random sampling dari populasi (124 orang siswa). Teknik korelasi pearson product moment digunakan dalam analisis penelitian ini digunakan untuk menganalisa hubungan antara variabel X ( Persepsi siswa tentang pengelolaan kelas oleh guru) dan variabel Y (Hasil Belajar Kimia). Data persepsi siswa mengenai pengelolaan kelas oleh guru didapatkan dari kuesioner yang disusun berdasarkan model Likert, dan nilai ujian siswa pada semester genap dijadikan sebagai data hasil belajar kimia. Semua analisis uji yand dilakukan menggunakan bantuan program SPSS (Statistical Product and Service Solution) versi 16.0 for windows, diantara uji ini adalah uji linearitas, uji normalitas dan uji hipotesis Hasil analisis yang dilakukan menunjukkan terdapatnya hubungan yang signifikan antara persepsi siswa tentang pengelolaan kelas oleh guru dengan hasil belajar kimia, dimana (t=6,206 > 2,045) artinya t tabel lebih kecil daripada t hitung yang didapatkan sehingga mengartikan bahwa hipotesis alternatif diterima sedangkan hipotesis nihil ditolak. Kesimpulannya aalah terdapatnya hubungan antara kedua variabel yaitu persepsi siswa tentang pengelolaan kelas oleh guru (variabel X) dan hasil belajar kimia (variabel Y) kelas XI SMA.
ANALISIS PENYEBAB KESULITAN SUB MATERI POKOK KIMIA SEMESTER 1 KELAS X IPA 3 MENGGUNAKAN METODE LEAN SIX SIGMA DI SMA NEGERI 8 PADANG Elva Laila; Alizar Ulianas
Ranah Research : Journal of Multidisciplinary Research and Development Vol. 1 No. 4 (2019): Ranah Research : Journal Of Multidisciplinary Research and Development (August
Publisher : Dinasti Research

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Abstract

Perencanaan, proses, penilaian dan pengawasan di dalam pembelajaran ialah standar pendidikan yang perlu untuk meningkatkan efisiensi dan efektifitas pada pendidikan dasar dan menengah. Berdasarkan hasil observasi pembelajaran kimia pada semester I kelas X IPA 3 di SMA Negeri 8 Padang, diketahui ada 20 sub materi pokok di bawah kriteria ketuntasan minimal (KKM) 75 yang berpengaruh terhadap kualitas hasil pembelajaran, maka diperlukan metode untuk menemukan penyebab kesulitan siswa. Peneliti memilih menggunakan metode lean six sigma (define, measure dan analyze) yang bertujuan untuk menganalisis secara sistematis penyebab-penyebab kesulitan sub materi pokok kimia di bawah kriteria ketuntasan minimal. Penelitian ini adalah penelitian deskriptif dengan instrument penelitian adalah lembar observasi dan pedoman wawancara, sedangkan teknik pengumpulan data yang digunakan adalah observasi, wawancara, dan studi dokumentasi. Berdasarkan hasil penelitian, diketahui adanya 10 penyebab kesulitan pada satu materi, yaitu materi interaksi antar partikel dengan 30 alasan (8,33 %) pada penilaian 1 (siswa selalu melakukan alasan) yang tersebar pada enam faktor penyebab (man, measure, material, machine, methode, enviroment) dan tujuh pada macro process map (proses 2,3,5,6,7,8 dan 9). Berdasarkan alasan-alasan siswa, dari 10 penyebab kesulitan tersebut ada 6 penyebab kesulitan materi interaksi antar partikel yang juga berpengaruh terhadap mata pelajaran yang lain dengan kelas yang sama maupun berbeda, yaitu parkir sekolah, toilet sekolah, kantin sekolah, peraturan seragam sekolah, kegiatan ekstrakurikuler dan jadwal pelajaran. Namun, ada juga 4 penyebab kesulitan materi interaksi antar partikel yang juga berpengaruh terhadap sub materi pokok kimia yang lain, yaitu kriteria ketuntasan minimal mata pelajaran kimia, perangkat pembelajaran kimia, media pembelajaran kimia dan peralatan praktikum kimia. Oleh sebab itu, untuk mencapai hasil belajar sesuai dengan KKM, perlu untuk menghilangkan atau mengurangi penyebab-penyebab kesulitan tersebut dari proses tata tertib peserta didik hingga proses pembelajaran.
Studi Literatur Penggunaan Bahan Ajar Berorientasi Chemistry Triangle Pada Materi Kimia Terhadap Hasil Belajar Peserta Didik Kiky Vebrielna Sari; Alizar Ulianas
Ranah Research : Journal of Multidisciplinary Research and Development Vol. 3 No. 2 (2021): Ranah Research : Journal Of Multidisciplinary Research and Development (Februar
Publisher : Dinasti Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (447.193 KB) | DOI: 10.38035/rrj.v3i2.365

Abstract

Tujuan studi ini adalah untuk mengetahui gambaran pengaruh penggunaan bahan ajar berorientasi chemistry triangle pada materi kimia terhadap hasil belajar peserta didik. Jenis penelitian ini adalah penelitian kepustakaan (library research) yang menggunakan analisis deskriptif. Data yang digunakan adalah data sekunder yaitu jurnal ilmiah berupa artikel. Metode pengumpulan data pada penelitian ini adalah metode dokumentasi dengan teknik analisis data berupa analisis isi (content analysis). Berdasarkan hasil review jurnal yang telah dilakukan didapatkan hasil bahwa penggunaan bahan ajar berorieontasi chemistry triangle pada materi kimia berpengaruh terhadap peningkatan hasil belajar peserta didik yang ditunjukkan dengan nilai F-hitung > F-tabel atau t-hitung > t-tabel.
Development of Acid Base E-Module Based on Guided Discovery Learning to Improve Digital Literacy Skills of Senior High School Phase F Students Haifa Hafifah; Yerimadesi Yerimadesi; Alizar Alizar; Desy Kurniawati
Jurnal Penelitian Pendidikan IPA Vol 11 No 7 (2025): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i7.11382

Abstract

This study aims to analyze the validity, practicality, and effectiveness of the acid-base e-module based on guided discovery learning on students' digital literacy skills. The development model used is the Plomp development model. The developed e- module was validated by three lecturers and two chemistry teachers. The module's practicality test was carried out by three chemistry teachers and 33 high school students. The module's effectiveness test was carried out using the pre-experimental method with a non-equivalent control group design. The validity test is explained using Aiken's V formula. The overall validity test results were obtained of 0.91 with a valid category. The results of the e-module practicality test carried out by teachers and students were 89.4 and 87.09% with a very practical category. The average N-Gain value in the experimental class was 0.75, which is in the high category. Based on the results of data analysis, it can be concluded that the acid-base e-module, based on guided discovery learning that was developed, is valid, practical, and effective in improving the digital literacy skills of Phase F (Grade XI) high school students
Efektivitas Media Pembelajaran Discord Terintegrasi Flipped Classroom dan Guided Inquiry Learning pada Materi Laju Reaksi Terhadap Hasil Belajar Peserta Didik Reza Akmar; Mawardi Mawardi; Alizar Ulianas; Faiza Qurrata Aini
Jurnal Penelitian Pendidikan IPA Vol 10 No 1 (2024): January
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i1.6385

Abstract

This study aims to determine the effectiveness of Discord instructional media integrated with flipped guided inquiry learning on reaction rates on students’ learning outcomes. The instructional media has been tested for its validity and practicality prior to the study. The study was conducted using quasi-experimental with pretest-posttest non-equivalent control group design. Sample consists of 72 students from SMA Negeri 13 Padang participated in this study, with class F1 and F2 as the experiment and control group respectively. Students’ learning outcomes were assessed with instrument consisting of multiple choices questions. Results shown the higher N-gain value from experimental group with 0.70 compared to control group with 0.33. Furthermore, the t-test results yielded a value of t-count = 8.11 > t-table = 1.99, indicating that the means were statistically significant. These findings suggest Discord instructional media integrated with flipped guided inquiry learning was effective to improve students’ learning outcomes.
Development of an acid-base e-module based on discovery learning and integrated with interactive learning media to improve chemistry literacy Novalina Panja Putri Panjaitan; Andromeda Andromeda; Alizar Alizar; Okta Suryani
Jurnal Konseling dan Pendidikan Vol. 14 No. 2 (2026): JKP
Publisher : Indonesian Institute for Counseling, Education and Therapy (IICET)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29210/1225100

Abstract

Low levels of students’ chemical literacy indicate the need for innovative learning resources, particularly for abstract and quantitative topics such as acid–base chemistry. This study aimed to develop and evaluate a Discovery Learning-based acid–base e-module integrated with interactive learning media. This Educational Design Research employed the Four-D (4-D) model. The study involved 16 students and four chemistry teachers in the needs analysis, six expert validators, two chemistry teachers and 30 students in practicality testing, and 26 Grade XII students in effectiveness testing. Chemical literacy was measured using a 15-item test with excellent internal consistency (Cronbach’s α = 0.95). Data were analyzed using Aiken’s V, percentage scores, N-gain, Shapiro–Wilk, and paired-samples t-test. The e-module obtained an Aiken’s V of 0.83, indicating validity, while practicality scores were 94.44% for teachers and 91.20% for students, with a combined score of 92.82%, categorized as very practical. The mean chemical literacy score increased from 5.42 to 61.14, with an N-gain of 0.59, categorized as moderate. The paired-samples t-test showed a significant difference between pretest and posttest scores, t(25) = 20.00, p < .001. The developed e-module is therefore a valid and highly practical learning resource that provides preliminary evidence of its potential to improve students’ chemical literacy in acid–base chemistry.
COGNITIVE TEST INSTRUMENT TO MEASURE THE CHEMICAL LITERACY SKILLS OF HIGH SCHOOL STUDENTS REGARDING SALT HYDROLYSIS Nesfitri Aufa Zakiyah Zakiyah; Yerimadesi Yerimadesi; Desy Kurniawati; Alizar Alizar
SPEKTRA: Jurnal Kajian Pendidikan Sains Vol. 12 No. 2 (2026): SPEKTRA: Jurnal Kajian Pendidikan Sains
Publisher : Physics Education Study Program, Faculty of Education and Teacher Training, UNSIQ

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32699/cy76j121

Abstract

Scientific literacy ability has also become a focus of attention in international assessments, namely through the Programme for International Student Assessment. Indonesia ranked 68th out of 81 participating countries with a science literacy score of 383. This low achievement indicates that the scientific literacy ability of students in Indonesia still requires serious attention. Scientific literacy has several branches, one of which is chemical literacy. Difficulty in understanding chemical concepts can affect chemical literacy ability, as chemical literacy is a student's ability to understand and apply basic chemical concepts accurately and effectively in everyday life. The purpose of this study is to develop a chemical literacy test instrument using the Rasch model. The objective of this study was to develop a chemistry literacy test instrument using the Rasch model. This research is a research and development (R&D) study employing the Rasch model. The test instrument was examined for validity, reliability, difficulty level, and discrimination index. The subjects of this study were 120 high school students. The research instrument used was a set of test items that had been developed. Based on the results of the analysis, the Rasch model can be applied to the developed chemistry literacy test instrument on the topic of salt hydrolysis. The field test results for the developed instrument indicate that it is valid and can be used to measure students' chemistry literacy ability. The validity of the instrument was assessed through empirical validity analysis, with Outfit MNSQ values ranging from 0.81 to 1.20, Outfit ZSTD values ranging from -1.43 to 1.34, and point measure correlation values ranging from 0.60 to 0.72. Reliability was assessed based on a person reliability of 0.78 and an item reliability of 0.99.
Co-Authors Andromeda Andromeda Annisa Aulia Budhi Oktavia Budhi Oktavia Christina Lydia Makmur Deski Beri Desy Kurniawati Elva Laila Faiza Qurrata Aini Fitria, Yanti Haifa Hafifah Hardeli Hardeli Hary Sanjaya Hesty Parbuntari Hutdia Putri M Ilyas Muhammad Isa Indang Dewata Iryani Iryani Kiky Vebrielna Sari Mawardi Mawardi Miftahul - Khair Miftahul Khair Minda Azhar Muhammad Gani Ariski Natia Afriana S Nesfitri Aufa Zakiyah Zakiyah Nilu Gussarsi Novalina Panja Putri Panjaitan Nurhasanah Nurhasanah Popon Sucimiasih Reza Akmar Rosi Efliana Suryani, Okta Watin Dehistora Widya Janatul Putri Winda Annisa Suryanti Yerimadesi Yohandri Yulia Mona Liza Yulkifli Yulkifli Yusmaita, Eka Zonalia Fitriza zulhendra - Zulhendra