Afdal Bahri
Unknown Affiliation

Published : 2 Documents
Articles

Found 2 Documents
Search

EFEKTIVITAS PEMBELAJARAN CORE DALAM MENINGKATKAN KETERAMPILAN MENGKOMUNIKASIKAN DAN PENGUASAAN KONSEP KELARUTAN DAN KSP

Jurnal Pendidikan dan Pembelajaran Kimia Vol 3, No 1 (2014): Jurnal Pendidikan dan Pembelajaran Kimia
Publisher : Program Studi Pendidikan Kimia FKIP Unila

Show Abstract | Original Source | Check in Google Scholar | Full PDF (285.274 KB)

Abstract

This research aimed to describe the effectiveness of CORE learning model to improve the communicating  skilland mastery concept on solubility and solubility product constant.  The population were all students XI IPA in SMAN 8 Bandar Lampung 2012-2013 and class XI IPA1 and IPA3 as samples.  Purposive sampling were used as a method with quasi-experimental non equivalent control group design.  Effectiveness of  CORE learning model was measured by the N-gain  that significantly difference.  The results showed the N-gain  average of communicating skill for the experimental class and control were 0.62 and 0.46 and for mastery the concept  were 0.57 and 0.47.  Based on hypothesis test, both N-gain’s have t-test higher than t-table. therefore CORE learning model was effective in improving the communicating skill and mastery concept of solubility. Penelitian ini bertujuan untuk mendeskripsikan efektivitas pembelajaran CORE untuk meningkatkan keterampilan mengkomunikasikan pada materi kelarutan dan hasil kali kelarutan.  Populasi penelitian ini adalah seluruh siswa kelas XI IPA SMA Negeri  8 Bandar Lampung tahun ajaran 2012-2013 dengan kelas XI IPA1 dan kelas XI IPA3 sebagai sampel.  Teknik pengambilan sampel menggunakan purposive sampling penelitian ini menggunakan metode kuasi eksperimen dengan Non equivalent Control Group Design.  Efektivitas model pembelajaran CORE diukur berdasarkan perbedaan N-gain yang signifikan.  Hasil penelitian menunjukkan rata-rata  N-gain keterampilan mengkomunikasikan untuk kelas eksperimen dan kelas kontrol  yaitu 0.62 dan 0.46.  Sedangkan penguasaan konsep untuk kelas ekperimen dan kontrol yaitu 0.57 dan 0.47.  Berdasarkan uji t, kedua  N-gain memiliki t-hitung yang lebih tinggi dari t-tabel , model pembelajaran  CORE terbukti efektif dalam meningkatkan keterampilan mengkomunikasikan dan penguasaan konsep kelarutan dan hasil kali kelarutan.Kata kunci : CORE, keterampilan mengkomunikasikan, penguasaan konsep

Study of Humic Acid Adsorption Equilibrium on Dual Nanofiber PMMA/PVDF

JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 1 (2018): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Original Source | Check in Google Scholar | Full PDF (556.273 KB)

Abstract

The main objective of this study is to investigate the isotherm sorption of humic acid (HA) from aqueous solution onto dual nanofiber PMMA/PVDF. Batch adsorption experiments were carried out using HA solution as an adsorbate under variety of concentration in the range of 50-200 mg/L. The experimental data were analyzed by the Langmuir, Freundlich and Sips models of adsorption. The experimental results indicate that, the adsorption capacity of HA adsorption increases with an increase in the HA concentrations. The adsorption of HA onto dual nanofiber PMMA/PVDF agrees well with the Langmuir isotherm models with the maximum adsorption capacity was found to be 137.40 mg g-1 at concentration of 100 mg L-1.