FINAL KOMPETISI DCF UNDIP 2021

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

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

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%

Which species is most likely to lose a positron (β+)

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

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Senyawa B mengalami reaksi S_N1 paling cepat

• BENAR

• SALAH

2-nitrofenol lebih mudah menguap dibandingkan dengan 4-nitrofenol

• BENAR

• SALAH

Asam 2-nitrobenzoat pH-nya lebih kecil daripada asam 4-aminobenzoat

• BENAR

• SALAH

PbF₂ is significantly more soluble in a water than strong acid

• BENAR

• SALAH

• 1026 atm

• 1027 atm

• 4464 atm

• 4462 atm

• 4452 atm