U2-2-1 - Esters Flashcards
Part of the Esters, Fats and Oils topic from Unit 2 of Higher Chemistry, Nature's Chemistry
Name this functional group
Ester link
This group of compounds are isomers of esters.
Carboxylic acids
Which two types of compounds react to form esters?
Alcohols and carboxylic acids
Name this type of reaction
Condensation
or esterification
In a ………. reaction, two molecules are joined together with the elimination of a small molecule.
Condensation
What catalyst is used in this reaction?
Concentrated sulfuric acid
Which part of this ester came from the carboxylic acid?
The part attached to ‘C=O’
Which part of this ester came from the alcohol?
The part attached to ‘C−O’
Condensation reaction
In a condensation reaction, two molecules are joined together with the elimination of a small molecule.
In a ………… reaction, a molecule reacts with water to break down into smaller molecules.
hydrolysis
opposite of condensation
During ester synthesis, it’s important to use a condenser (or a wet paper towel). Why?
To prevent volatile products/reactants from evaporating
Esters are volatile
State two observations which would indicate you have made an ester
- Oily layer on the surface
- Fruity fragrance
What two products are formed during ester hydrolysis?
Alcohol + Carboxylic acid
Hydrolysis
In a hydrolysis reaction, a molecule reacts with water to break down into smaller molecules.
opposite of condensation
What does an ester link look like?
Complete the name of this ester:
prop…. ethan…..
Propyl ethanoate
Alcohol part ends in -yl, carboxylic acid part ends in -oate
Complete the name of this ester:
…..yl …..oate
Ethyl methanoate
Alcohol part ends in -yl, carboxylic acid part ends in -oate
Identify two functional groups in aspirin
Ester link (-COO-), carboxyl (COOH)
Identify two functional groups in erythrose
Hydroxyl (OH), carbonyl (C=O)
