Quiz
MO6 Acids
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Perguntas do quiz (6)
1What are two things that acids have/that make a good acid?
- AStabilised conjugate base
- BA highly polarised Z-H bond
- CA weakly polarised Z-H bond
- DAn unstable conjugate base
2pH refers to a solution while pKa refers to the dissociation of a proton from a group to form a conjugate base.
- AVerdadeiro
- BFalso
3pKa is constant for a functional group irrelevant of what compound it is in.
- AVerdadeiro
- BFalso
4pKa of a carboxylic acid is about:
- A5
- B10
- C8
- D3
5We can approximate the percentage of a compound ionised used the equation [blank_start]ΔpH = pH - pKa[blank_end].
If pH < pKa then ΔpH will be [blank_start]negative[blank_end] and the conjugate [blank_start]acid[blank_end] is present.
If pH > pKa then ΔpH will be [blank_start]positive[blank_end] and the conjugate [blank_start]base[blank_end] is present.
To estimate the %, we follow:
ΔpH = 0.5 then it is ~[blank_start]70%[blank_end] ionised
ΔpH = 1 then it is ~[blank_start]90%[blank_end] ionised
ΔpH = 2 then it is ~[blank_start]99%[blank_end] ionised- AΔpH = pH - pKa
- BΔpH = pKa - pH
- Cnegative
- Dpositive
- Eacid
- Fbase
- G70%
- H90%
- I99%
- J50%
6Choose the incorrect statement.
- AAn isostere of a compound has similar molecular shape and volume, and similar physiochemical properties.
- BA bioisostere is an isostere which also has similar biological properties.
- CTetrazoles are bioisosteres of carboxylic acids.
- DIndoles are isosteres of amides.
Informações
- Descrição
- PHCY211 (Molecules) Quiz sobre MO6 Acids, criado por Mer Scott em 08-04-2018.
- Autor
- Mer Scott
- Idioma
- English
- Visualizações
- 8
- Etiquetas
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