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All Journal Jurnal Riset Kimia Dalton : Jurnal Pendidikan Kimia dan Ilmu Kimia
Wardhani, Rr. Ariessanty Alicia Kusuma
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Chemistry Education

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IMPLEMENTASI MODEL PEMBELAJARAN CONTEXTUAL TEACHING and LEARNING (CTL) DALAM MENINGKATKAN HASIL BELAJAR SISWI KELAS XI PADA MATERI SISTEM KOLOID DI SMA ISLAM DARUL MUHIBBIEN BINUANG Susilawati, Susilawati; Wardhani, Rr. Ariessanty Alicia Kusuma; Pardede, Antoni
Dalton : Jurnal Pendidikan Kimia dan Ilmu Kimia Vol 7, No 2 (2024)
Publisher : Universitas Islam Kalimantan MAB Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31602/dl.v7i2.15613

Abstract

Penelitian ini merupakan Implementasi model pembelajaran contextual teaching and learning (CTL) dalam meningkatkan hasil belajar siswi kelas XI pada materi sistem koloid di SMA Islam Darul Muhibbien Binuang bertujuan untuk meningkatkan aktivitas siswi, hasil belajar dan tanggapan siswi terhadap penerapan model pemebelajaran contextual teaching and learning (CTL). Pendekatan yang digunakan adalah kuantitatif dan quasi ekperimen. Subjek penelitian adalah siswa kelas XIB sebanyak 20 siswi sebagai kelas eksperimen dan kelas XIC sebanyak 20 siswi sebagai kelas kontrol. Aktivitas siswi tergolong sangat tinggi dengan persentase rata-rata 91,25%, hasil penelitian menunjukkan bahwa hasil belajar meningkat dengan persentase hasil belajar yang diperoleh 15% nilai sebelum menggunakan model CTL, sedangkan siswi telah menggunakan model CTL persentase yang diperoleh 95%. Tanggapan siswi adalah positif sebanyak 94%, sedangkan yang bertanggapan negatif 6%. Hasil penelitian ini menyimpulkan bahwa penerapan model pembelajaran CTL dapat meningkatkan aktivitas siswi, hasil belajar, dan minat belajar siswi.
Isolasi Senyawa Metabolit Sekunder Dari Ekstrak Heksana Batang Kelakai (Stenochlaena palustris): Pardede, Antoni; Wardhani, Rr. Ariessanty Alicia Kusuma
Jurnal Riset Kimia Vol. 15 No. 2 (2024): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v15i2.703

Abstract

Isolation is a method of obtaining pure secondary metabolite compounds from plant extracts, which provide benefits such as health, medicine, cosmetics, and agriculture. This research has been carried out and aims to isolate the secondary metabolite compound from the hexane extract of the kelakai stems (Stenochlaena palustris). Phytochemical screening of that extract resulted in a positive-containing steroid. The isolation method includes the separation of hexane extract with column chromatography using silica gel as the stationary phase and eluted successively with hexane, chloroform, and ethyl acetate (step gradient polarity). The column chromatography of the hexane extract resulted in five fractions (H1–H5). Furthermore, fraction H3 was purified to obtain a white needle crystal. The isolated compound spot is invisible in thin-layer chromatography (KLT) under an ultraviolet lamp at 254 nm and 365 nm wavelengths. The isolated compound structure was elucidated by proton and carbon nuclear magnetic resonance (NMR), and mass spectroscopy (MS), as well as comparisons with literature data. The isolated compound is a group of steroids identified as β-sitosterol with the molecular formula C29H50O.
Co-Authors Antoni Pardede Susilawati, Susilawati