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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.