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  • 8/17/2019 x22l4qxjtd2apqlgdwbw Signature 35d5605f74ee70ac3ecd77e5fe3bbbcda780a1864624b3d62cd426bf13dde972 Pol…

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    Petunjuk 

    isilah identitas pada tempat yang telah di sediakan

    KELOMPOK :

    NAMA :1 .……………………………………..

    2 .……………………………………..

    3 ……………………………………..

    4 ……………………………………..

    5 ……………………………………..

    KELAS :

    MATA PELAJARAN:

    Lembar Kerja Peserta Didik 

    KEPOLARAN SENYAWA 

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    Tujuan Pembelajaran

    A. Kognitif 

    1. Peserta didik dapat menggambarkan proses terbentuknya senyawa kovalen

    polar dan senyawa kovalen non polar berdasarkan pasangan elektron bebas

    melalui diskusi kelompok.

    2. Peserta didik dapat menggambarkan proses terbentuknya senyawa kovalen

    polar dan senyawa kovalen non polar berdasarkan keelektronegatifan

    melalui diskusi kelompok.

    3. Peserta Didik dapat menentukan senyawa polar dan nonpolar

    4. Afektif  

    Peserta didik dapat mengembangkan perilaku rasa ingin tahu,

    disiplin, jujur, objektif, bertanggung jawab dalam diskusi

    5. Psikomotor

    Peserta didik dapat dengan terampil menggambarkan struktur lewis

    dari senyawa kovalen polar dan nonpolar

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    Petunjuk 

    1. Baca dan pahami materi yang ada dalam lembar kerja sisiwa

    2. Gunakan bahan bacaan lain atau literatur yang anda punya tentang materi yang

    bersangkutan

    3. Diskusikan materi dengan seksama secara berkeloompok untuk menjawab pertanyaan

    dan membuat kesimpulan

    1. IKATAN KOVALEN POLAR DAN KOVALEN NONPOLAR

    Ikatan kovalen merupakan ikatan yang terjadi karena penggunaan elektron bersama.

    Perhatikan ikatan kovalen berikut ini :

    A. H H B. H Cl

    Pasangan elektron manakah yang mempunyai perbedaan keelektronegatifan besar.

    Berdasarkan tabel keelektronegatifan.

    Unsur Keelektronegatifan

    H 2.1

    C 2.5

    SENYAWA KOVALEN POLAR

    DAN NON POLAR

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    Cl 3,0

    O 3,5

    F 4,0

    Jawab :

    a. IKATAN KOVALEN POLAR

    Senyawa kovalen polar adalah senyawa yang terbentuk karena adanyaikatan kovalen polar. Dimana ikatan kovalen polar adalah ikatan yang terbentuk antara

    atom-atom yang mempunyai perbedaan kelektronegatifan besar.

    Jadi, dari ikatan kovalen berikut ini, manakah ikatan kovalen polar ?

    A. H H B. H Cl

    Jawab :

    Kenapa? :

    b. IKATAN KOVALEN NON POLAR

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    Senyawa ikatan kovalen nonpolar adalah senyawa yang terbentuk 

    karena adanya ikatan kovalen nonpolar. Dimana ikatan kovalen nonpolar

    adalah ikatan yang terbentuk antar atom yang tidak memiliki

    perbedaan keelektronegatifan (perbedaan keelektronegatifan = 0 ).

    Jadi, dari ikatan kovalen berikut ini, manakah ikatan kovalen polar ?

    A. H H B. H Cl

    Jawab :

    Kenapa? :

    2. MOLEKUL POLAR DAN NONPOLAR

    Molekul polar atau non polar bergantung pada geometri (bentuk) molekulnya.

    Contoh A. O B. Cl Be Cl

    H H

    Bagaimana dengan bentuk molekul NH3 dan CCL4 ? tentukan polar atau tidaknya

    molekul tersebut!

    Jawab :

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    Molekul Polar adalah yang A.

    Molekul nonpolar adalah yang B.

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    Momen Dipol

    Kepolaran dinyatakan dalam suatu besaran yang disebut momen dipol (µ) ,

    yaitu hasil kali antara selisih muatan (Q) dengan jarak (r) antara pusat

    muatan positif dengan pusat muatan negatifnya.

    Tabel momen dipol beberapa zat

    Rumus Zat Momen Dipol (D)

    HF 1,91

    HCl 1,03

    HBr 0.79

    HI 0.38

    H2O 1.84

    NH3 1.46

    CH3Cl ( kloroform) 1.86

    CH3COCH3 (aseton) 2.8

    CCL4 0

    CO2 0

    µ = Q . r

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    Lembar kegiatan

    1. Jelaslkan dengan struktur Lewis jenis senyawa berikut :

    a. NH3

    b. HF

    c. PCl3

    d. H2O

    Jawaban :

    2. Tuliskan struktur Lewis dari senyawa berikut beserta jenis molekulnya :

    a. BF3Jawaban :

    KEGIATAN

    SISWA

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    3. Diketahui :

    UNSUR KEELEKTRONEGATIFAN

    H 2,1

    C 2,5

    N 3,0

    Cl 3,0

    F 4,0

    Berdasarkan data di atas, tentukan jenis senyawa berikut :

    a. H 

    F

    b. H  Cl

    c. N2

    Jawaban :

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    4. Berdasarkan pemahaman tentang kepolaran, apakah senyawa berikut larut dalam air?

    Jelaskan

    a. Kloroform

    b. CCL4

    c. HCl

    d. Minyak  

    Jawaban :

    SELAMAT BEKERJA Kesimpulan :

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    DAFTAR RUJUKAN

    Purba, M., 2006. ”Kimia Untuk SMA Kelas X”., Jilid 1, Erlangga, Jakarta, Halaman 77 s/d 84.

    Sunardi., 2008 “Kimia Bilingual” Jilid 1, Yrama Widya, Bandung,cetakan 1, Halaman 63 s/d

    83.

    Sutersna,nana., 2007” Kimia Untuk SMA kelas X”., Gr afindo, Bandung, , Halaman 53 s/d 56.

    Pur ba, michael dan aas saidah., 2013, “Kimia Untuk Smk/Mak Kelas X”, Erlangga, Jakarta,

    Halaman

    106 s/d 109.

    Sofyatiningrum,etti dkk., 2007, “Sains Kimia Sma/Ma Kelas X”, Bumi Aksara,Jakarta, Halaman

    71 s/d 74.

    Justiana, sandri dan muchtaridi., 2009, “Kimia 1 Sma Kelas X, Yudhistira”, Jakarta, Halaman 55

    s/d 57.