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Arfak Chem: Chemistry Education Journal
Published by Universitas Papua
ISSN : 2615627X     EISSN : 26156288     DOI : https://doi.org/10.30862/accej.v5i1.368
Core Subject : Humanities, Science, Education, Social,
Humanities Chemistry Education Social Sciences
Arfak Chem: Chemistry Education Journal is a scientific journal, published by Chemistry Education Department, University of Papua. This journal is published 2 times in a year, June and December. This journal contains research results relating to the topic of education and chemistry teaching.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol. 6 No. 2 (2023): Arfak Chem" : 5 Documents clear
PENGARUH MODEL PEMBELAJARAN KOOPERATIF TIPE NUMBER HEAD TOGETHER (NHT) TERHADAP HASIL BELAJAR KOGNITIF PESERTA DIDIK PADA MATERI ASAM BASA DI KELAS XI IPA SMA ADVENT MANOKWARI Sari, Novi Dian; Fahzal, Nur Arifah Adila; Faisal, Faisal
Arfak Chem: Chemistry Education Journal Vol. 6 No. 2 (2023): Arfak Chem
Publisher : Universitas Papua, Manokwari, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/accej.v6i2.602

Abstract

This study aims to determine the influence and differences in cognitive learning outcomes among students using the NHT-type cooperative learning model. This research uses a pre-experimental design in the form of a one-group pretest-posttest design. The sampling technique involves gathering data through observation, interviews, posttests, and documentation. The results obtained were a mean pretest score of 42.09 and a posttest mean of 74.96. The hypothesis test yielded a t-test with a Sig value (2-tailed) of 0.000, indicating a significant impact on the cognitive learning outcomes of students taught using the NHT type cooperative learning model, with a 78% influence. The N-Gain analysis, with a value of 0.61, classifies the students' understanding of the acid-base material with NHT as moderate.
IDENTIFIKASI KANDUNGAN SENYAWA MERKURI (Hg) PADA KRIM PEMUTIH WAJAH YANG BEREDAR DI PASAR AMPARITA Lidiawati, Dewi; Mubarak, Syahrul; Yulan, Yulan; Rombe, Yunita Pare
Arfak Chem: Chemistry Education Journal Vol. 6 No. 2 (2023): Arfak Chem
Publisher : Universitas Papua, Manokwari, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/accej.v6i2.516

Abstract

Logam merkuri (Hg) adalah salah satu bahan berbahaya yang diduga terkadung didalam beberapa jenis kosmestik, yang dapat menimbulkan kerusakan pada organ tubuh jika digunakan dalam jangka panjang dan juga dapat bersifat toksik. Krim pemutih yang tidak terdaftar BPOM perlu diteliti kandungannya, karena krim tersebut banyak dijual bebas di pasaran, memiliki harga yang relatif jauh lebih murah, serta mudah diperoleh. Penelitian ini bertujuan untuk mengetahui adanya kandunngan senyawa merkuri pada krim pemutih yang beredar di pasar Amparita yang di uji dengan dengan metode reaksi reduksi oksidasi menggunakan pelarut spesifik, berdasarkan penelitian yang telah dilakukan diperoleh dari 8 sampel krim pemutih wajah 7 sampel diantaranya diduga positif mengandung merkuri dan 1 sampel diantaranya negatif mengandung merkuri. Hasil ini didapatkan dari pengujian dengan menggunakan pelarut spesifik yaitu KI yang ditandai dengan adanya endapan berwarna merah/jingga, untuk pelarut NaOH ditandai dengan adanya endapan kuning pada sampel dan untuk pelarut SnCl2 dan HCl ditandai dengan adanya endapan erwarnah putih pada sampel. 
IDENTIFIKASI SENYAWA ANTIOKSIDAN DALAM FRAKSI METANOL DAUN BIDARA (Ziziphus mauritiana) Sriwijayanti, Sriwijayanti; Nasiro, Siti; Humesi, Lusi; Situmeang, Boima; Puspitasari, Puspitasari
Arfak Chem: Chemistry Education Journal Vol. 6 No. 2 (2023): Arfak Chem
Publisher : Universitas Papua, Manokwari, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/accej.v6i2.525

Abstract

Tumbuhan Bidara (Ziziphus mauritiana) merupakan salah satu tumbuhan yang dimanfaatkan oleh masyarakat untuk mengobati berbagai penyakit. Bidara  tumbuh didaerah yang kering dengan curah hujan yang sangat rendah. Di Indonesia, tumbuhan bidara banyak ditemukan didaerah Banten, Jawa, Madura, Bali, Sawu, Rote, Timur leste, Alor, Makasar, Bima, dan Sumba. Pada penelitian sebelumnya, ekstrak daun bidara diketahui memiliki aktivitas sebagai antioksidan. Penelitian ini bertujuan untuk mengisolasi senyawa bioaktif dan menguji aktivitas antioksidan pada fraksi metanol daun bidara. Ekstraksi dilakukan menggunakan metode maserasi dengan pelarut metanol. Pemisahan dan pemurnian senyawa menggunakan metode kromatografi. Uji aktivitas antioksidan menggunakan metode DPPH (1,1-difenil-2-pikrihidrazin). Karakterisasi dan elusidasi struktur isolat yang mempunyai nilai % inhibisi tinggi dilakukan dengan menggunakan spektroskopi UV dan FTIR. Berdasarkan hasil uji aktivitas antioksidan fraksi 10 menghasilkan nilai % inhibisi yang tinggi yang dapat meredam radikal bebas. Hasil elusidasi struktur, senyawa yang diperoleh merupakan senyawa flavonoid.
DESKRIPSI PEMAHAMAN KONSEPTUAL SISWA PADA KONSEP STRUKTUR ATOM DAN SISTEM PERIODIK UNSUR (SPU) Kisdiono, Toyib Febri
Arfak Chem: Chemistry Education Journal Vol. 6 No. 2 (2023): Arfak Chem
Publisher : Universitas Papua, Manokwari, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/accej.v6i2.548

Abstract

Students' conceptual understanding of chemistry material is very important because good conceptual understanding can help to solve a problem, connect it with other relevant knowledge, and make it easier to study related material. This research aims to describe students' conceptual understanding of atomic structure and SPU material. This study employs a qualitative descriptive research method and approach. The research instrument is a multiple-choice test, with 25 questions divided into six indicators. We collected data through written tests. The data analysis process employs descriptive statistics, specifically using percentages. The research shows that students have a good understanding of all of the indicators. They understand that 42.59% of students in the sufficient category understand how electrons, protons, and neutrons relate to isotopes, isotones, and isobars. However, 33.70% of students in the poor category understand and can figure out the electron configuration. 19.16% of students in the very poor category can figure out the quantum number. 32.10% of students in the poor category can figure out periods and groups in SPU. And 32.10% of students in the less category have a good understanding of the periodicity of elements. The research results show that there is a need to improve the learning process, either through the application of learning models or the use of appropriate learning media, so that students' conceptual understanding can increase.
ANALISIS FAKTOR-FAKTOR KESULITAN BELAJAR KIMIA PADA MATERI STOIKIOMETRI KELAS X DI SMA NEGERI 1 MANOKWARI Allo, Angelina Bubun; Azrun, Muhammad
Arfak Chem: Chemistry Education Journal Vol. 6 No. 2 (2023): Arfak Chem
Publisher : Universitas Papua, Manokwari, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/accej.v6i2.554

Abstract

This research was conducted to explain the factors and factors of chemistry learning difficulties experienced by students in stoichiometry material. This type of qualitative phenomenological research was used in this research. The subjects of this research were 58 class X students of SMA Negeri I Manokwari. The strategy for collecting information in research is carried out using perceptions, meetings, surveys, and report studies. The examination of information from perceptions is completed illustratively, and the investigation of information from meetings and opinion polls is completed clearly and interpretively. The research results show that the causes of students' learning difficulties are caused by internal factors, including students' low numerical capacity, students' low understanding of interpreting material, students' low learning inspiration, and students' low insight. External factors include less conducive study time and less optimal use of the facilities provided by parents.

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