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A2 Chemistry Unit 2 > Amides > Flashcards

Flashcards in Amides Deck (11)
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1

Draw the structure of the amide group

See notes page 15

2

Describe the nomenclature of amides

1️⃣ use parent acid name - replace ‘-oic acid’ with ‘-amide’
2️⃣ if branched - ‘-CONH2’ group counts as number 1 carbon atom
3️⃣ if alkyl substituents on nitrogen atom - name is preceded by ‘N- (alkyl)’ eg N-methylbenzamide

3

Describe the physical properties of amides

⭕️ Methanamide = liquid but rest are white solids
⭕️ high bp - hydrogen bonded dimers forming

4

Draw the H bonded dimer of amides

See notes pg 17

5

What are the two methods of preparing an amide

1. React carboxylic acids with ammonia
2. React ammonia/amines with acyl chlorides

6

Write the equation of acid hydrolysis of ethanamide

Carboxylic acid and ammonium salt of dilute acid produced
See notes page 18

7

Write the equation for base hydrolysis of ethanamide

See notes page 18
Salt of carboxylic acid and ammonia gas produced

8

How do you test if something is an amide

- add NaOH (base hydrolysis) and heat
- if ammonia gas produced then it’s an amide
- test for ammonia gas: conc HCl ➡️ white smoke observed

9

What is the definition of dehydration of amides

A reaction which involves the elimination of water from the amide, forming a nitrile

10

Write the equation for the dehydration of ethanamide

See notes page 18

11

Why are amides weak bases

1️⃣ lone pair on N delocalised w pi bond of C=O
2️⃣ makes lone pair more stable
3️⃣ electrons less easily donated to hydrogen atom