
MAI week 1
Authored by Rizka Yuniar
Chemistry
University
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Manakah diantara sinar berikut yang memiliki energi paling besar?
ESR
NMR
Inframerah
Gelombang Mikro
Semuanya kira-kira setara
Answer explanation
Urutan energinya adalah: inframerah > gelombang-mikro > ESR > NMR.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Ilmuwan pertama yang memulai penelitian spektroskopi adalah …
Isaac Newton
Nicolaus Copernicus
Richard P. Feynman
Gustav Kirchhoff
Robert Wilhelm Bunsen
Answer explanation
Isaac Newton meletakkan dasar untuk spektroskopi melalui percobaannya menggunakan prisma untuk mendispersikan sinar matahari menjadi berbagai spektrum warna.
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Dalam suatu pengukuran spektrofotometri senyawa X dengan lampu natrium didapati bahwa persen transmitansinya adalah sebesar 5,0%. Berapakah nilai absorbansi senyawa X ini?
3
1
2
1,301
1,125
Answer explanation
A=2−log%T
A=2−log 5
A=1,301
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Dalam suatu sampel yang terdiri atas 3 komponen, X, Y dan Z didapati bahwa masing-masing komponen memiliki transmitansi berurutan 0,075; 0,01; dan 0,200. Berapakah absorbansi total yang akan teramati dari spektroskopi campuran ini?
2
1,275
3,125
3,824
1,824
Answer explanation
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Nilai absorptivitas molar suatu analit dipengaruhi oleh …
Konsentrasi analit dalam sampel
indeks bias dalam larutan
elektrolit
A dan B benar
A, B dan C benar
Answer explanation
Nilai absorptivitas molar (ϵ) suatu analit tidak tetap dalam semua kondisi. Meningkatnya konsentrasi analit menyebabkan meningkatnya interaksi intermolekuler yang dapat merubah nilai ϵ demikian pula nilai indeks bias pelarut dan adanya elektrolit.
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