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I'm not an expert teacher or lecturer of chemistry. I was only a student from SMA NEGERI 15 SURABAYA who had been one of the Bronze Medalist Participants of Olimpiade Sains Nasional X (2011) of Chemistry In Manado, North Sulawesi, 11 - 16 September 2011 and graduated in 2012. Now, I'm studying at Universitas Airlangga in Surabaya, Indonesia. I do love chemistry and I would like to help them who had difficulties in studying chemistry. That's why, please understand me if you found some misconcepts in my entries. Suggestions are always necessary in order to develop this blog. And I'm sorry because my English isn't so well.

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Saturday, March 31, 2012

Soal Latihan Persiapan IChO (Part VI)

Kimia Silikon

Silikon adalah unsur yang terletak pada golongan yang sama dengan karbon. Oleh karena itu, silikon dapat membentuk beberapa senyawa yang analog dengan senyawa - senyawa karbon, seperti Silan (SinH2n+2), namun kestabilannya tentu berbeda dengan senyawa yang berbasis karbon.

a. Seorang ilmuwan yang tidak mau disebut namanya berhasil mensintesis sebuah analog gula dimana seluruh atom karbon pada gula tersebut digantikan dengan silikon. Gambarkan struktur gula tersebut jika diketahui "gula" tersebut adalah analog gula berkarbon 6!

b. Bandingkan kestabilan senyawa tersebut dengan kestabilan glukosa jika diketahui data - data energi disosiasi (dalam kJ mol-1) sebagai berikut:

C - C = 346
Si - Si = 226
C - O = 359
Si - O = 466
C = O = 806
Si = O = 642
C - H = 416
Si - H = 326

Berdasarkan jawaban Anda, mungkinkah ditemukan kehidupan berbasis silikon?

c. CO2 dan SiO2, walaupun rumus molekulnya mirip, namun struktur kedua senyawa ini sangat berbeda. Gambarkan struktur keduanya dan jelaskan mengapa struktur keduanya berbeda.

Created by:
Andhika Tangguh Pradhana
Silver Medalist of IChO 2011

SMA Kharisma Bangsa

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