Nainggolan, Bajoka
Jurnal Pendidikan Kimia (JPKim)

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Chemical Analysis of Effectiveness of Integrated Practicum Learning in Class XII-IPA SMA on The Implementation of Curriculum 2013 in Medan

Jurnal Pendidikan Kimia (JPKim) Vol 8, No 2 (2016): Agustus 2016
Publisher : Jurnal Pendidikan Kimia (JPKim)

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Abstract

Abstract, Execution learning integrated chemical lab on the implementation of the curriculum in 2013 focused on the development of the balance of the ability to form good human (soft skills), with life skills appropriately (hardskills) on the competence of the knowledge, skills, and spiritual attitudes through learning is planned and effective, do scientific approach (scientific approach), through the competence of attitudes, knowledge, and skills to observe, ask questions, reason, analyze, innovate and communicate appropriately and effectively. The effectiveness of the implementation of the integrated chemical lab learning is defined as the thoroughness and success achieved after the implementation of learning. For it to do research with the aim to find out how the effectiveness of the integrated chemical lab learning in class XII-IPA on curriculum implementation in 2013 in SMA Medan in 2016. Samples were taken from the population as much as 5 purposiv chemistry teacher class XII-Science, 15th graders XII-IPA, and laboratory 5 of 5 SMA. Data obtained through questionnaires, interviews, and observations based on the frequency distribution persentatif processed and analyzed descriptively qualitative. The results of the questionnaire obtained a majority (60%) and chemistry teacher (66.67%) students less effective category. The results of the interview (60%) chemistry teacher, (53.33%) sisiwa, and (80%) laboratory majority of categories less effective in teaching practices integrated chemical lab. Results observation documentation, laboratory facilities and infrastructure gained less support and less effective category. Of the 10 topics that should be practiced practicum students, the results obtained; two high schools implement complete practicum title 5 (50%), a high school title completed executing 3 (30%), and two high schools did not carry out a practicum (completeness 0%). From the results it can be concluded that the implementation of the integrated chemical lab learning in class XII IPA SMA-on curriculum implementation in 2013 in the city of Medan category less effective.Keywords: effectiveness, implementation of integrated chemical lab learning, curriculum 2013

Uji Kelayakan Minyak Goreng Curah dan Kemasan yang Digunakan Menggoreng Secara Berulang

Jurnal Pendidikan Kimia (JPKim) Vol 8, No 1 (2016): April 2016
Publisher : Jurnal Pendidikan Kimia (JPKim)

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Abstract

Abstrak. Penelitian ini dilakukan bertujuan untuk mengetahui angka peroksida dan asam lemak bebas (FFA = free fatty acid) minyak goreng curah dan kemasan merek A, B, dan C yang dipakai masyarakat menggoreng secara berulang menggunakan metode titrasi alkalimetri dan iodometri. Populasi penelitian adalah minyak goreng curah dan kemasan dan sampel diambil secara  acak 2 kg minyak curah,dan 2 kg masing-masing minyak kemasan merek A, B, dan C yang dijual di pasar tradisional di Medan. Metode penelitian menggunakan titrasi alkalimetri dan iodometri. Data yang diperoleh dianalisis dengan cara membandingkan angka peroksida dan FFA minyak goreng yang dipakai menggoreng secara berulang (minyak jelanta) terhadap minyak goreng control (sebelum digunakan menggoreng) dan standar mutu minyak goreng SNI 01-3741-2013. Dari analisis data diperoleh hasil sebagai berikut: Angka peroksida sebelum dipakai menggoreng (mek O2/kg); minyak curah: 2,718; minyak kemasan merek A: 2,039; merek B: 2,039; merek C: 2,039; setelah penggorengan I - IV (150-200oC): minyak curah: 6,796; 9,588; 13,659; 17,669: merek-A: 4,757; 8,835; 10,873; 14,951; merek-B: 5,437; 8,834; 11,553; 14,951; merek-C:  4,757; 8,155; 12,912; 15,696. Angka FFA sebelum dipakai menggoreng (mg KOH/gr): minyak curah: 0,0686; minyak kemasan merek A: 0,0480; merek B: 0,0480; merek C: 0,0412; setelah penggorengan I-IV: minyak curah: 0,3981; 0,5215; 0,7007; 1,1262; minyak kemasan merek-A:  0,3294; 0,4187; 0,6451; 0,9540; merek-B: 0,3562; 0,4392; 0,6931; 0,8853; merek-C: 0,3232; 0,3843; 0,6958; 0,8586. Ambang batas standar mutu minyak goreng yang layak dipakai menurutSNI 01-3741-2013: angka peroksida 10 mek O2/kg; FFA. 0,6 mg KOH/g. Dari  analisis data dapat disimpulkan bahwa: Minyak goreng curah dan kemasan merek A, B, C yang dijual di pasartradisional di Medan memenuhi standar kualitas SNI 01-3741-2013 sebelum digunakan untuk menggoreng, dan bila digunakan maka hanya dua kali layak dipakai untuk menggoreng bahan pangan. Disarankan kepada masyarakat khususnya di kota Medan agar pemakaian minyak goreng curah dan kemasan merek A, B, dan C yang dijual di pasar tradisional di Medan cukup hanya dua kali dipakai untuk menggoreng bahan pangan demi menjaga kesehatan masyarakat  yang menggunakannya. Kata kunci: minyak goreng, angka peroksida, angka asam lemak bebas (FFA)

Penerapan Model Quantum Teaching Menggunakan Media Peta Konsep dalam Pembelajaran Struktur Atom di Kelas X SMA

Jurnal Pendidikan Kimia (JPKim) Vol 7, No 3 (2015): Desember 2015
Publisher : Jurnal Pendidikan Kimia (JPKim)

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Abstract. This study aims to determine learning outcome and collaborative character of students who are taught with Quantum Teaching Learning model  using concept maps media on Atomic Structure. Research population is science students of grade X , and samples selected were 30 students of experimental  and  control classes respectively. The test instrument 20 multiple choice questions, and a non-test observation sheet. Soft ware data is processed with SPSS 16.0 for Windows, acquired pre-test experimental class = control, post-test experimental> control (90 > 85). The mean gain experimental > control (0.805 > 0.693), improvement of learning outcomes experimental > control (80.5% > 69.6%). Hypothesis test (α = 0.05) t test ≥ t tab.. (5.563 > 0.687), mean improvement of learning outcomes chemistry student with QT > conventional. The mean of the experimental character of student collaboration 67.75 (good), control 57.00 (enough). Correlation of learning outcomes with student collaboration experiment 90.4% (very high), controls 60.5% (high), QT contribution to the learning outcomes and cooperation experimental class 81.7%, 36.6% control. Conclusions: The increase in the value of learning outcomes chemistry atomic structure and character of students taught by cooperative learning model QT higher than conventional methods. Keywords: quantum teaching learning, media concept map, atomic structure

Penerapan Model Quantum Teaching Menggunakan Media Peta Konsep dalam Pembelajaran Struktur Atom di Kelas X SMA

JURNAL PENDIDIKAN KIMIA (JPKim) Vol 7, No 3 (2015): Desember 2015
Publisher : JURNAL PENDIDIKAN KIMIA (JPKim)

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Abstract

Abstract. This study aims to determine learning outcome and collaborative character of students who are taught with Quantum Teaching Learning model  using concept maps media on Atomic Structure. Research population is science students of grade X , and samples selected were 30 students of experimental  and  control classes respectively. The test instrument 20 multiple choice questions, and a non-test observation sheet. Soft ware data is processed with SPSS 16.0 for Windows, acquired pre-test experimental class = control, post-test experimental> control (90 > 85). The mean gain experimental > control (0.805 > 0.693), improvement of learning outcomes experimental > control (80.5% > 69.6%). Hypothesis test (α = 0.05) t test ≥ t tab.. (5.563 > 0.687), mean improvement of learning outcomes chemistry student with QT > conventional. The mean of the experimental character of student collaboration 67.75 (good), control 57.00 (enough). Correlation of learning outcomes with student collaboration experiment 90.4% (very high), controls 60.5% (high), QT contribution to the learning outcomes and cooperation experimental class 81.7%, 36.6% control. Conclusions: The increase in the value of learning outcomes chemistry atomic structure and character of students taught by cooperative learning model QT higher than conventional methods. Keywords: quantum teaching learning, media concept map, atomic structure

The optimization of acid hydrolysis on bioethanol production from durian peel waste (Durio zibethinus murr)

JURNAL PENDIDIKAN KIMIA (JPKim) Vol 10, No 2 (2018): August 2018
Publisher : JURNAL PENDIDIKAN KIMIA (JPKim)

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Abstract

Abstract:       The dependence on fossil fuels is a big problem and needs an urgent solution. One of the steps taken is the utilization of bioethanol "lignocellulose". This research uses natural material with high lignocellulose content that is durian peel waste and aims to make durian peel waste as raw material of bioethanol production with variation of H2SO4 concentration, temperature, and acid hydrolysis time. The variable used is H2SO4 concentration of 1%, 3%, and 5%; temperature of 100˚C, 120˚C, and 140˚C; and time of 120 minutes, 150 minutes, and 180 minutes. From the analysis, the highest bioethanol purity was obtained at 99.81% at 100˚C and hydrolysis time at 120 minutes.Keywords:acid hydrolysis; bioethanol; durian peel waste; optimization

Uji Kelayakan Minyak Goreng Curah dan Kemasan yang Digunakan Menggoreng Secara Berulang

JURNAL PENDIDIKAN KIMIA (JPKim) Vol 8, No 1 (2016): April 2016
Publisher : JURNAL PENDIDIKAN KIMIA (JPKim)

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Abstract

Abstrak. Penelitian ini dilakukan bertujuan untuk mengetahui angka peroksida dan asam lemak bebas (FFA = free fatty acid) minyak goreng curah dan kemasan merek A, B, dan C yang dipakai masyarakat menggoreng secara berulang menggunakan metode titrasi alkalimetri dan iodometri. Populasi penelitian adalah minyak goreng curah dan kemasan dan sampel diambil secara  acak 2 kg minyak curah,dan 2 kg masing-masing minyak kemasan merek A, B, dan C yang dijual di pasar tradisional di Medan. Metode penelitian menggunakan titrasi alkalimetri dan iodometri. Data yang diperoleh dianalisis dengan cara membandingkan angka peroksida dan FFA minyak goreng yang dipakai menggoreng secara berulang (minyak jelanta) terhadap minyak goreng control (sebelum digunakan menggoreng) dan standar mutu minyak goreng SNI 01-3741-2013. Dari analisis data diperoleh hasil sebagai berikut: Angka peroksida sebelum dipakai menggoreng (mek O2/kg); minyak curah: 2,718; minyak kemasan merek A: 2,039; merek B: 2,039; merek C: 2,039; setelah penggorengan I - IV (150-200oC): minyak curah: 6,796; 9,588; 13,659; 17,669: merek-A: 4,757; 8,835; 10,873; 14,951; merek-B: 5,437; 8,834; 11,553; 14,951; merek-C:  4,757; 8,155; 12,912; 15,696. Angka FFA sebelum dipakai menggoreng (mg KOH/gr): minyak curah: 0,0686; minyak kemasan merek A: 0,0480; merek B: 0,0480; merek C: 0,0412; setelah penggorengan I-IV: minyak curah: 0,3981; 0,5215; 0,7007; 1,1262; minyak kemasan merek-A:  0,3294; 0,4187; 0,6451; 0,9540; merek-B: 0,3562; 0,4392; 0,6931; 0,8853; merek-C: 0,3232; 0,3843; 0,6958; 0,8586. Ambang batas standar mutu minyak goreng yang layak dipakai menurutSNI 01-3741-2013: angka peroksida 10 mek O2/kg; FFA. 0,6 mg KOH/g. Dari  analisis data dapat disimpulkan bahwa: Minyak goreng curah dan kemasan merek A, B, C yang dijual di pasartradisional di Medan memenuhi standar kualitas SNI 01-3741-2013 sebelum digunakan untuk menggoreng, dan bila digunakan maka hanya dua kali layak dipakai untuk menggoreng bahan pangan. Disarankan kepada masyarakat khususnya di kota Medan agar pemakaian minyak goreng curah dan kemasan merek A, B, dan C yang dijual di pasar tradisional di Medan cukup hanya dua kali dipakai untuk menggoreng bahan pangan demi menjaga kesehatan masyarakat  yang menggunakannya. Kata kunci: minyak goreng, angka peroksida, angka asam lemak bebas (FFA)

Development of chemical practice guides class xi project based to improve student’s chemical learning outcomes on acid base materials

JURNAL PENDIDIKAN KIMIA (JPKim) Vol 10, No 2 (2018): August 2018
Publisher : JURNAL PENDIDIKAN KIMIA (JPKim)

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Abstract

Abstract:       This study aims to obtain a standard project-based laboratory chemistry guide for class XI students of Second semester on acid base material. The sample consists of 3 tutorial guide publisher A, B, and C, 2 teacher of senior high school (SMA) 4 Medan, 2 Unimed chemistry lecturer and 2 class XI SMA 4 Medan. Research is descriptive and experimental development with ADDIE models. The results show that the guides have been developed and the standards are in accordance National Education Standards Agency (BSNP). Result validation practice guides developed get the average score of 3.48 times higher than the standard practicum guide A = 3.18, B = 3.32; and C= 30.75. Experimental practice test improves the average learning outcomes of experimental class 1 (using development guide) 70.8% and experiment 2 (using textbook) 54.1%. Psychomotoric and affective grade experiment class 1 higher than the experimental class 2. The resultant learning improvement data was analyzed by right t test. Test of t-test for learning result obtained t count and t table, 6.68 and 1.678, respectively, at level 0.05. This indicates that the project-based practice guide has been well developed and feasible for chemical learning in senior high school.Keywords:acid base material; development; laboratory guide; project based learning

Chemical Analysis of Effectiveness of Integrated Practicum Learning in Class XII-IPA SMA on The Implementation of Curriculum 2013 in Medan

JURNAL PENDIDIKAN KIMIA (JPKim) Vol 8, No 2 (2016): Agustus 2016
Publisher : JURNAL PENDIDIKAN KIMIA (JPKim)

Show Abstract | Original Source | Check in Google Scholar | Full PDF (415.972 KB)

Abstract

Abstract, Execution learning integrated chemical lab on the implementation of the curriculum in 2013 focused on the development of the balance of the ability to form good human (soft skills), with life skills appropriately (hardskills) on the competence of the knowledge, skills, and spiritual attitudes through learning is planned and effective, do scientific approach (scientific approach), through the competence of attitudes, knowledge, and skills to observe, ask questions, reason, analyze, innovate and communicate appropriately and effectively. The effectiveness of the implementation of the integrated chemical lab learning is defined as the thoroughness and success achieved after the implementation of learning. For it to do research with the aim to find out how the effectiveness of the integrated chemical lab learning in class XII-IPA on curriculum implementation in 2013 in SMA Medan in 2016. Samples were taken from the population as much as 5 purposiv chemistry teacher class XII-Science, 15th graders XII-IPA, and laboratory 5 of 5 SMA. Data obtained through questionnaires, interviews, and observations based on the frequency distribution persentatif processed and analyzed descriptively qualitative. The results of the questionnaire obtained a majority (60%) and chemistry teacher (66.67%) students less effective category. The results of the interview (60%) chemistry teacher, (53.33%) sisiwa, and (80%) laboratory majority of categories less effective in teaching practices integrated chemical lab. Results observation documentation, laboratory facilities and infrastructure gained less support and less effective category. Of the 10 topics that should be practiced practicum students, the results obtained; two high schools implement complete practicum title 5 (50%), a high school title completed executing 3 (30%), and two high schools did not carry out a practicum (completeness 0%). From the results it can be concluded that the implementation of the integrated chemical lab learning in class XII IPA SMA-on curriculum implementation in 2013 in the city of Medan category less effective.Keywords: effectiveness, implementation of integrated chemical lab learning, curriculum 2013

PEMURNIAN ASAM LINOLEAT TERKONJUGASI HASIL SINTESA DARI RISINOLEAT CASTOR OIL DENGAN KROMATOGRAFI KOLOM SILIKAGEL PERAK NITRAT

JURNAL PENELITIAN SAINTIKA Vol 14, No 1 (2014): Maret 2014
Publisher : JURNAL PENELITIAN SAINTIKA

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Abstract

Conjugated Linoleic acid (CLA) was sepereted by usingcolomn chromatography with silicagel – AgNO3 as stationaryphase. Seperation based on the differences reversibility ofcoordination bond between double bond and silver ion. Theindreasing number of double bond and trans isomers morestrongly the molecule is retained. Gradien elution was carried outby various n-hexane (H) and Acetone (A) (v/a) e. g: 97.5/2.5; 95/5;90/10; 80/20; 70/30 and 60/40 in 8 vial x 2.5 mL. Each of fractionwas analyzd by using GC,FTIR, UV and GC-MS and It’s comparewith authentic CLA standard and the best was ratio (v/v) of eluen(H/A) 95/5. The composition of product ratio of CLA/linoleic was0,85 : 1 or 77.6 % compared to the authentic standar 1.45/1.