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Contoh Soal Ikatan Kimia : Soal No 31-40

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31. Perhatikan Keterangan Di Bawah !

a. SbH3
b. NH3
c. AsH3
d. PH3
e. BiH3
 
Senyawa manakah yang memiliki titik didih paling tinggi?

Jawaban : BiH3
 
Pembahasan:

Yang memengaruhi titik didih golongan IVA, VA, VIA, VIIA, dan VIIIA adalah Gaya Van der Walls. Dalam satu golongan, dari atas ke bawah, memiliki Gaya Van der Walls yang semakin bertambah sebanding dengan bertambah besarnya Mr. Sehingga, titik didih suatu senyawa bertambah dari atas ke bawah dalam satu golongan. BiH3 memiliki Massa yang terbesar dibandingkan satu golongan dengannya.

32. Perhatikan Keterangan Di Bawah !

a. HF
b. HCl
c. HBr
d. HI
e. H2O

Senyawa manakah yang memiliki titik didih paling tinggi?

Jawaban : H2O

Pembahasan :

Ikatan hidrogen mempengaruhi titik didih suatu senyawa. Semakin besar ikatan hidrogennya, semakin tinggi titik didihnya. Namun, khusus pada air (H2O), terjadi dua ikatan hidrogen pada tiap molekulnya. Akibatnya jumlah total ikatan hidrogennya lebih besar daripada asam florida (HF) yang seharusnya memiliki ikatan hidrogen terbesar (karena paling tinggi perbedaan elektronegativitasnya) sehingga titik didih air lebih tinggi daripada asam florida.

33. Perhatikan Keterangan Di Bawah !

a. SiH4
b. CH4
c. SnH4
d. GeH4
e. H2O

Senyawa manakah yang memiliki titik didih paling rendah?

Jawaban : CH4
 
Pembahasan :

Yang memengaruhi titik didih senyawa unsur hidrida golongan IVA, VA, VIA, VIIA, dan VIIIA adalah Gaya Van der Walls. Dalam satu golongan, dari atas ke bawah, unsur memiliki Gaya Van der Walls yang semakin bertambah sebanding dengan bertambah besarnya Mr. Sehingga, titik didih suatu senyawa bertambah dari atas ke bawah dalam satu golongan.

34. Perhatikan Keterangan Di Bawah !

a. CH4
b. C2H6
c. C3H8
d. C4H10
e. C5H12
 
Senyawa manakah yang memiliki titik didih paling tinggi?

Jawaban : C5H12
 
Pembahasan :

Semakin panjang rantai Karbon, maka semakin kuat ikatannya, sehingga semakin sulit untuk memutuskan ikatannya dan titik didihnya semakin tinggi
 
35. Diketahui unsur A memiliki massa=19 dan neutron=10 sedangkan unsur Q memiliki massa=127 dan neutron=74. Jika A dan Q membentuk senyawa QA 3, maka apakah bentuk dari molekul ini?

Jawaban : planar bentuk T dengan tipe molekul AX3E 2
 
Pembahasan:
 
Unsur A memiliki nomor atom = Massa-Neutron = 19-10 = 9 = 2 7
Unsur Q nomor atom = Massa-Neutron = 127-74 = 53 = 2 8 18 18 7
Jumlah ev atom pusat Q =7
Jumlah domain elektron Ikatan (X) = 3
Jumlah domain elektron Bebas (E) =
Tipe molekul AX3E2 yaitu planar bentuk T (IF 3)

36. Diketahui unsur A bermassa=1 dan neutron=0 sedangkan unsur Q memiliki massa 16 dan neutron=8. Jika A dan Q membentuk senyawa A2Q, maka apakah bentuk dari molekul ini?

Jawaban : bentuk V dengan tipe molekul AX2E2
 
Pembahasan:
 
Unsur A memiliki nomor atom = Massa-Neutron = 1-0 = 1
Unsur Q memiliki nomor atom = Massa-Neutron = 16-8 = 8 = 2 6
Jumlah ev atom unsur pusat Q =6
Jumlah domain elektron Ikatan (X) = 2
Jumlah domain elektron Bebas (E) =
Tipe molekul AX2E2 yaitu bentuk V (H 2O)


37. Diketahui unsur A memiliki massa=12 dan neutron=6 sedangkan unsur Q memiliki massa=1 tanpa neutron. Jika A dan Q membentuk senyawa AQ 4, maka apakah bentuk dari molekul ini?

Jawaban : Tetrahedral dengan tipe molekul AX4
 
Pembahasan:
 
Unsur A memiliki nomor atom = Massa-Neutron = 12-6 = 6 = 2 4
Unsur Q memiliki nomor atom = Massa-Neutron =1
Jumlah ev atom unsur pusat A =4
Jumlah domain elektron Ikatan (X) = 4
Jumlah domain elektron Bebas (E) =
Tipe molekul AX4 yaitu Tetrahedral (CH4)

38. Diketahui unsur A memiliki massa=10 dan neutron=5 sedangkan unsur Q memiliki massa=19 dan neutron=10. Jika A dan Q membentuk senyawa AQ 3, maka apakah bentuk dari molekul ini?

Jawaban : Segitiga Planar dengan tipe molekul AX3
 
Pembahasan:
 
Unsur A memiliki nomor atom = Massa-Neutron = 10-5 = 5 = 2 3
Unsur Q memiliki nomor atom = Massa-Neutron = 19-10 = 9 = 2 7
Jumlah ev atom unsur pusat A = 3
Jumlah domain elektron Ikatan (X) = 3
Jumlah domain elektron Bebas (E) = =0
Tipe molekul AX3 yaitu Segitiga Planar (BF3)


39. Diketahui unsur A memiliki massa=14 dan neutron=7 sedangkan unsur Q memiliki massa=1 tanpa neutron. Jika A dan Q membentuk senyawa AQ 3, maka apakah bentuk dari molekul ini?

Jawaban : Trigonal Piramida dengan tipe molekul AX3
 
Pembahasan:
 
Unsur A memiliki nomor atom = Massa-Neutron =14-7 = 7 = 2 5
Unsur Q memiliki nomor atom = Massa-Neutron =1
Jumlah ev atom unsur pusat A =5
Jumlah domain elektron Ikatan (X) = 3
Jumlah domain elektron Bebas (E) =
Tipe molekul AX3E yaitu Trigonal Piramida/piramida segitiga/piramida trigonal (NH3)


40. Diketahui unsur A memiliki massa=31 dan neutron=16 sedangkan unsur Q memiliki massa=35 dan neutron=18. Jika A dan Q membentuk senyawa AQ 3, maka apakah bentuk dari molekul ini?

Jawaban : Trigonal Piramida dengan tipe molekul AX3E 2
 
Pembahasan:
Unsur A memiliki nomor atom = Massa-Neutron =31-16 = 15 = 2 8 5
Unsur Q memiliki nomor atom = Massa-Neutron =35-18= 17 = 2 8 7
Jumlah ev atom unsur pusat A = 5
Jumlah domain elektron Ikatan (X) = 3
Jumlah domain elektron Bebas (E) =
Tipe molekul AX3E yaitu Trigonal Piramida/piramida segitiga/piramida trigonal (PCl3)
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1 Response to "Contoh Soal Ikatan Kimia : Soal No 31-40"

  1. Terima kasih sobat...really help me to understand this topic

    ReplyDelete

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