FINAL KOMPETISI DCF UNDIP 2021
Quiz
•
Chemistry
•
1st - 5th Grade
•
Practice Problem
•
Hard
Putri Widiarti Mariyono 24030119120026
Used 3+ times
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20 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Ada berapa banyak ikatan sigma dan pi pada HO2CCHCHCO2H
7 sigma dan 2 pi
9 sigma dan 2 pi
11 sigma dan 3 pi
8 sigma dan 3 pi
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Pada suhu kamar, fluor berbentuk gas (titik didih 188° C), sedangkan brom berbentuk cair (titik didih +59°C). Manakah dari berikut ini yang paling menjelaskan perbedaan keadaan fisik kedua halogen
Gaya antarmolekul dalam bromin lebih lemah
Ikatan kovalen dalam bromin lebih kuat
Ikatan kovalen dalam bromin lebih lemah
gaya antarmolekul dalam bromin lebih kuat
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
In order to determine the sulfate composition of a fertiliser, a chemist dissolved 2.00 g of fertiliser in 100 mL of water, and added barium nitrate solution. The chemist noticed the formation of a white solid, and kept adding the barium nitrate solution until no more solid formed. The white solid was filtered and, after drying, weighed 1.90g. What is the percentage by mass of sulfate in the fertiliser
95%
41%
39%
30%
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which species is most likely to lose a positron (β+)
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
An organic chemist analysed an unknown compound. By mass spectrometry, the chemist found that the compound had a molecular mass of 114 . An elemental analysis was also performed which showed that the compound contained 63% C, 9% H and 28% O by mass. Which one of the following compounds could it have been
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Senyawa B mengalami reaksi SN1 paling cepat
BENAR
SALAH
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
2-nitrofenol lebih mudah menguap dibandingkan dengan 4-nitrofenol
BENAR
SALAH
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