Esters

Question 1

What are esters made from?

Answer 1

Alcohols and carboxylic acids

Question 2

What functional group do esters contain?

Answer 2

The ester link (-COO-)

Question 3

What are esters used for?

Answer 3

1. Flavourings
2. Fragrances
3. Solvents for non-polar compounds that are insoluble

Question 4

What ester is made when ethanol and propanoic acid are reacted together?

Answer 4

Ethyl propanoate

Question 5

How are esters formed?

Answer 5

Through a condensation/ esterification reaction between an alcohol and a carboxylic acid

Question 6

What happens in a condensation reaction?

Answer 6

Two molecules are joined together with the elimination of a small molecule

When forming an ester through condensation, the small molecule that is eliminated is water

Question 7

What is the equation for the formation of an ester?

Answer 7

Alcohol + Carboxylic Acid –> Ester + Water

Question 8

How do you name an ester?

Answer 8

By using the format:

1. -yl on the side further from the C=O
2. -anoate on the side with the C=O

Question 9

What happens in a hydrolysis reaction?

Answer 9

A molecule reacts with water to break down into smaller molecules

Question 10

What is the equation of the hydrolysis of Methyl propanoate?

Answer 10

Methyl Propanoate + Water –> Methanol + Propanoic Acid

Question 11

What happens in a condensation reaction?

Answer 11

Two molecules are joined together with the elimination of a small molecule