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Metacognitive Skill Profiles of Chemistry Education Students in Solving Problem at Low Ability Level Ijirana, I.; Supriadi, S.
Jurnal Pendidikan IPA Indonesia Vol 7, No 2 (2018): June 2018
Publisher : Program Studi Pendidikan IPA Fakultas Matematika dan Ilmu Pengetahuan Alam (FMIPA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpii.v7i2.14266

The objective of this study was to categorize and describe the behavior of chemistry education students' metacognitive skills who had a low chemical understanding (low ability) in solving problems. The findings would be the basis of data for the development of instructional design on chemistry topics by utilizing metacognitive skill aspects. The subject of this study was two first-year students of chemical education, academic year 2016/2017 that joined a basic chemistry course at the low-level ability in Universitas Tadulako. Two subjects were picked through networking using a valid test comprehension. The subjects were determined regarding the percentage of low ability which was 87% of 79 students. The profile data of metacognitive skill were obtained through an essay test, think aloud and interview. The earned data were reviewed, grouped, encoded, and examined to see its credibility employing the method and time triangulation. The research found that both students of chemistry education having a low-level of basic chemistry adopted planning skills in solving problems which were the problem identifying, goal determining, and strategy managing. However, both did not use monitoring and evaluating skills.

The Chemistry Competency Achievement of SMA Negeri 7 Palu Students Using Predict, Observe, and Explain (POE) Learning Model Ijirana, Ijirana; Wahyuni, Sri
Indonesian Journal on Learning and Advanced Education (IJOLAE) Vol. 1, No. 1, January 2019
Publisher : Faculty of Teacher Training and Education, Universitas Muhammadiyah Surakarta

This study is aimed to derive a description of learning result improvement on salt hydrolysis material by implementing POE (Predict, Observe, Explain) learning model on the students of grade XI at SMA Negeri 7 Palu. This study was a pre-experimental within Static Group Comparison design. Sampling was carried out in a simple random with class XI MIA 1 as the experiment class and XI MIA 5 as the replication class. The instruments used in this study divided into 3 competencies, the affective competency using an observation sheet, the psychomotor competency using self-assessment questionnaire and the cognitive competency using a final test. Statistical inferential analysis using t-test one right side by requiring normal and homogeneous data. The average psychmotor competency of students in the XI MIA 1 is 81, whilst for replication class is 79. The average cognitive competency of students in XI MIA 1 is 77 with deviation standard of 10.55, whilst for replication class is 75 with standard deviation of 12.98. The result of hypothesis test using t-test one right side is tcalculated> ttable or 3.32> 1.71, whilst for replication class is 1.85>1.72, so H0 was rejected. This result concludes that the implementation of POE learning model in Grade XI students at SMA Negeri 7 Palu improves learning achievement on salt hydrolysis material to be more than competency minimum standard of 70.

Test of Antioxidant Activity of Ant Nest Plants (Myrmecodia tuberosa Jeck) Extract from Toli-Toli Sulawesi Tengah Indra, Pande; Supriadi, Supriadi; Ijirana, Ijirana
Jurnal Akademika Kimia Vol 8, No 2 (2019)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (348.168 KB)

Ant nest plants have the greatest diversity in Papua, but due to the different location and climate between Papua and Sulawesi, especially Central Sulawesi, the composition and the active compound are different. Differences of plant species will give differences in the content and quality of simplicia from ant nest plants. This study aimed to determine the power of antioxidant in ant nest extract (Myrmecodia tuberosa Jeck) from Toli-Toli, Central Sulawesi. The sample of this study was taken at Labonu, Basidondo, and extracted by maceration method. The testing of antioxidant activity used DPPH (2,2-Diphenyl-1-picrihydrazyl). Antioxidant activity of ant nest extract was measured using spectrophotometry with concentration 20, 40, 60 and 80 ppm. The results showed that ant nest plant extract was classified as a very powerful antioxidant with an IC50 value of 26.84 ppm.

Patterns of Metacognitive Skills and External Representation of Students in Chemistry Problem Solving Ijirana Ijirana; Jusman Mansyur
Jurnal Ilmu Pendidikan Vol 25, No 2 (2019): December
Publisher : Universitas Negeri Malang

This research aims to examine the pattern of external representation and metacognitive skills in chemistry problem solving for students of chemistry education at Tadulako University. This picture will enrich the treasures of thinking skills in the field of science, namely how students/prospective teachers think in the context of metacognitive skills and how these students display an external representation system on chemistry concepts. The subject of this qualitative study was obtained through a purposive random sampling of 97 students who have been programmed Basic Chemistry course 2017/2018 academic year. Subjects were selected based on the results of the screening using a metacognitive skills assessment questionnaire (MCAI). Two problems solved by the subject by setting one-on-one thinking aloud. Subjects who complete the issue by setting further interviews at different times. The problem-solving activity was recorded using a video camera. The subject uses a type of representation and aspects of metacognitive skills and how to use the sequence of activities, analyzed in detail. The results showed that students of chemical education used metacognitive skills and external representations. So students solve chemical problems. Students also can improve knowledge retention related to linking new knowledge with previous knowledge, creating ideas, organizing, and even synthesizing knowledge. Students become productive and find solutions for problem-solving well

PENELITIAN PEMBUATAN METIL ESTER ASAM LEMAK RANTAI SEDANG DAN PANJANG SERTA PEMURNIAN GLISEROL DARI MINYAK KELAPA MURNI Mappiratu Mappiratu; Ijirana Ijirana
Jurnal Penelitian Hasil Hutan Vol 28, No 4 (2010): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Penelitian ini bertujuan untuk mendapatkan kondisi optimum metanolisis minyak kelapa murni (MKM) dalam reaktor berpengaduk, metode pemurnian gliserol dan metode pemisahan metil ester asam lemak rantai sedang dari rantai panjang. Hasil penelitian menunjukkan MKM yang dihasilkan memenuhi persyaratan sebagai bahan baku metil ester asam lemak, sebab MKM yang dihasilkan mengandung air dan asam lemak bebas (FFA) mengandung asam laurat yang tinggi yaitu di atas 50% (52,86%). Kecepatan pengaduk dan waktu reaksi berpengaruh terhadap produksi 500 rpm dan waktu reaksi 50 menit. Pada kondisi tersebut fraksi massa metil ester asam lemak mencapai 100%. Metode pemurnian gliserol berpengaruh terhadap derajat kemurnian gliserol, dengan derajat kemurnian gliserol tertinggi adalah 98,04% yang diperoleh dari metode pemurnian ekstraksi dan netralisasi. Hasil fraksionasi metil ester asam lemak menghasilkan enam fraksi, tiga fraksi yaitu (fraksi I dan II dan VI) mengandung metil laurat yang lebih rendah dari MKM asalnya, dan tiga fraksi (fraksi III, IV dan fraksi V) mengandung metil laurat di atas MKM asalnya (di atas 70%). Fraksi VI dinyatakan sebagai metal ester asam lemak rantai panjang dengan rendemen 50% dari total metil ester asam lemak.

PRACTICALITY ASSESSMENT DEVICE DEVELOPMENT OF LEARNING MODEL BASED METACOGNITIVE SKILL Ijirana -; Suyono -; Sri Poedjiastoeti
PROSIDING SEMINAR KIMIA PROCEEDING OF INTERNATIONAL CONFERENCE 2015
Publisher : PROSIDING SEMINAR KIMIA

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Practicality assessment device is developed according to PBKM model which has been rated valid by the experts. The aim of the research is to gain the valid PBKM model of the practility assessment device. The device consists of observation sheet of the applied model syntax, unit of learning program, and student’s worksheet. The valid score of the developed device is gained by giving the worksheet to five experts. The resultindicated that the whole evaluation aspects in the observation sheet of the applied model syntax which consist of direction to use the worksheet, the observation sheet content, and the used language gain the high score of validity. The validity of the whole evaluation aspects for the unit of learning program has been evaluated for high score by the experts, while the student’s activity sheet has been evaluated varies between high and very high. The result indicated the experts stated that the practicality score sheet which is developed from PBKM model is well-used in the implementation of PBKM model.

ANALISIS KEMAMPUAN PEMECAHAN MASALAH KIMIA SISWA KELAS XI DI SMAN KOTA PALU SULAWESI TENGAH Ijirana
Jurnal Dinamika Pendidikan Vol. 13 No. 3 (2020): November
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Kristen Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51212/jdp.v13i3.1936

Penelitian ini bertujuan untuk mendeskripsikan kemampuan pemecahan masalah siswa kelas XI SMAN di kota Palu. Pengukuran kemampuan pemecahan masalah di lihat dari kemampuan siswa dalam memecahkan masalah pada topik hidrokarbon dan termokimia dengan menggunakan tahap-tahap Polya, yaitu; memahami masalah, merencanakan pemecahan masalah, melaksanakan rencana, dan melihat kembali. Kemampuan pemecahan masalah siswa di katakan baik pada setiap tahap pemecahan masalah jika jumlah siswa yang berada pada kategori minimal tinggi sebanyak 60%. Penelitian ini adalah penelitian studi kasus. Sampel dalam penelitian ini berjumlah 240 siswa yang belajar kimia dari 507 siswa kelas XI di dua SMAN kota Palu. Sampel penelitian ditentukan menggunakan teknik random sampling. Data kemampuan pemecahan masalah diperoleh dari siswa dengan memberikan tes kemampuan pemecahan masalah yang berbentuk uraian bebas yang tervaliditasi. Temuan dari penelitian ini menunjukkan bahwa rata-rata siswa kelas XI SMAN di kota Palu hanya mampu menyelesaikan masalah tanpa memahami, melakukan perencanaan, dan melihat kembali hasil pemecahan masalahnya ketika memecahkan masalah hidrokarbon. Kemampun tersebut bahkan tidak dimiliki siswa pada topik Termokimia. Oleh karena itu, temuan ini mengindikasikan bahwa siswa SMAN di kota Palu belum mampu merepresentasikan masalah dalam bentuk gambar, simbol, pernyataan, ataupun kalimat matematika, belum mampu merencanakan pemecahan masalah, dan menghubungkan hasil yang diperoleh dengan konsep yang berhubungan. Temuan ini mengindikasikan perlunya siswa dilatih memecahkan masalah dalam pembelajaran dengan menerapkan langkah-langkah pemecahan masalah. Keywords: Hidrokarbon, Tahapan Polya, Pemecahan Masalah, Termokimia

Kajian Etanolisis In Situ Minyak Kelapa untuk Sintesis Etil Ester Asam Lemak Ijirana dan Afadil Ijirana dan Afadil
Biocelebes Vol. 3 No. 1 (2009)
Publisher : Biology Department, Mathematics and natural science, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar

There are several aim of this research, consist of: 1) to find out optimum concentration catalyst H2SO4 in synthesis of ethyl ester coconut oil fat acid when FFA contained in coconut flour more than 5 %, 2) to find out concentration of catalyst NaOH (percent v/v) that produce the higher fat acid ethyl ester product, 3) to find out ratio of ethanol 95 % / coconut flour, and 4) to find out the best reaction temperature of coconut oil ethanolysis in situ that produce ethyl ester coconut oil fat acid in higher yield. The first step is to know water contain on coconut flour. The second is to know oil contain in coconut flour using sochletation method. FFA analyzed was done to find out how many reaction will be done, transestherification and esterification. Esterification was not done because FFA contained only 2 % (not more than 5%). From this research, we can conclude that selected reaction condition are: ratio coconut flour with ethanol 95%, 1:5, concentration of catalyst, NaOH 1,2% and reaction temperature 55oC. Key words: Ethanolysis in situ, coconut oil, fat acid ethyl ester syntesis.

PENELITIAN PEMBUATAN METIL ESTER ASAM LEMAK RANTAI SEDANG DAN PANJANG SERTA PEMURNIAN GLISEROL DARI MINYAK KELAPA MURNI Mappiratu Mappiratu; Ijirana Ijirana
Jurnal Penelitian Hasil Hutan Vol 28, No 4 (2010): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2010.28.4.415-426

Penelitian ini bertujuan untuk mendapatkan kondisi optimum metanolisis minyak kelapa murni (MKM) dalam reaktor berpengaduk, metode pemurnian gliserol dan metode pemisahan metil ester asam lemak rantai sedang dari rantai panjang. Hasil penelitian menunjukkan MKM yang dihasilkan memenuhi persyaratan sebagai bahan baku metil ester asam lemak, sebab MKM yang dihasilkan mengandung air dan asam lemak bebas (FFA) mengandung asam laurat yang tinggi yaitu di atas 50% (52,86%). Kecepatan pengaduk dan waktu reaksi berpengaruh terhadap produksi 500 rpm dan waktu reaksi 50 menit. Pada kondisi tersebut fraksi massa metil ester asam lemak mencapai 100%. Metode pemurnian gliserol berpengaruh terhadap derajat kemurnian gliserol, dengan derajat kemurnian gliserol tertinggi adalah 98,04% yang diperoleh dari metode pemurnian ekstraksi dan netralisasi. Hasil fraksionasi metil ester asam lemak menghasilkan enam fraksi, tiga fraksi yaitu (fraksi I dan II dan VI) mengandung metil laurat yang lebih rendah dari MKM asalnya, dan tiga fraksi (fraksi III, IV dan fraksi V) mengandung metil laurat di atas MKM asalnya (di atas 70%). Fraksi VI dinyatakan sebagai metal ester asam lemak rantai panjang dengan rendemen 50% dari total metil ester asam lemak.

The Chemistry Competency Achievement of SMA Negeri 7 Palu Students Using Predict, Observe, and Explain (POE) Learning Model Ijirana Ijirana; Sri Wahyuni
Indonesian Journal on Learning and Advanced Education (IJOLAE) Vol. 1, No. 1, January 2019
Publisher : Faculty of Teacher Training and Education, Universitas Muhammadiyah Surakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/ijolae.v1i1.7474

This study is aimed to derive a description of learning result improvement on salt hydrolysis material by implementing POE (Predict, Observe, Explain) learning model on the students of grade XI at SMA Negeri 7 Palu. This study was a pre-experimental within Static Group Comparison design. Sampling was carried out in a simple random with class XI MIA 1 as the experiment class and XI MIA 5 as the replication class. The instruments used in this study divided into 3 competencies, the affective competency using an observation sheet, the psychomotor competency using self-assessment questionnaire and the cognitive competency using a final test. Statistical inferential analysis using t-test one right side by requiring normal and homogeneous data. The average psychmotor competency of students in the XI MIA 1 is 81, whilst for replication class is 79. The average cognitive competency of students in XI MIA 1 is 77 with deviation standard of 10.55, whilst for replication class is 75 with standard deviation of 12.98. The result of hypothesis test using t-test one right side is tcalculated ttable or 3.32 1.71, whilst for replication class is 1.851.72, so H0 was rejected. This result concludes that the implementation of POE learning model in Grade XI students at SMA Negeri 7 Palu improves learning achievement on salt hydrolysis material to be more than competency minimum standard of 70.

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