Amines, Amides, Amino acids and Proteins

Question 1

What is an amine?

Answer 1

A nitrogen compound where one or more of the hydrogen compounds in ammonia have been replaced by alkyl or aryl groups.

Question 2

Name this compound: H2NCH2CH2NH2

Answer 2

1,2-diaminoethane

Question 3

What is an amide?

Answer 3

Nitrogen compounds where the OH group of a carboxylic acid is replaced by an NH2 group.

Question 4

What state are methyl and ethyl amine at room temperature?

Answer 4

Gases

Question 5

What state are propyl and butyl amine at room temperature?

Answer 5

Liquid

Question 6

What do methyl and ethyl amines smell like?

Answer 6

Fishy smelling ammonia.

Question 7

Do alkyl amines dissolve in water and why?

Answer 7

Yes, as the Nitrogen in the amine group can hydrogen bond with the water.

Question 8

Are amines bronsted-lowry bases or acids and why?

Answer 8

Bases, as the lone pair of electrons on the nitrogen act as a proton/H+ acceptor.

Question 9

Why are alkyl amines stronger bases than ammonia?

Answer 9

The alkyl group is “electron releasing” and increase the electron density around the lone pair on the Nitrogen, making the attraction to the H+/proton stronger.

Question 10

Why is phenylamine a much weaker base than ammonia?

Answer 10

The electron lone pair on the nitrogen is delocalised into the pi cloud of the benzene ring.