sc23, alcohols and carboxylic acids (paper 2) Flashcards
what is the molecular formula for alcohol
C n H 2n+1 OH
how can ethanol be oxidised to ethanoic acid
- by chemicals called oxidising agents or
- the actions of microbes
what is the mian acid in vinegar
ethanoic acid
what is an alcohol
an alcohol forms a homologous series of compounds
what do the names of alcohol end in
anol
what functional group do all alcohols have
O-H (hydroxyl-
true or false: alcohols have similar chemical properties
true
true or false: alcohols don’t have similar chemical properties
false
true or false: alcohols show a gradual variation in physical properties
true
true or false: alcohols don’t show a gradual variation in physical properties
false
what does the molecular formula of alcohol differ by
C H 2
how is ethanol produced
from carbohydrates in aqueous solution by a process called fermentation
where can the carbohydrates come from for producing ethanol
- fruit (e.g grape)
- breakdown os starch (from wheat or barley)
what single-celled fungus helps speed up the production of ethanol by providing enzymes
yeast, a single-celled fungus
give the word equation for the production of ethanol
glucose –> ethanol + carbon dioxide
give the symbol equation for the production of ethanol
C6H12O6 (aq) –> 2 C2H6OH + 2 CO2
what is the optimum tempurature for fermentation
35
what happens when oxygen is present during fermentation
- aerobic respiration happens instead of anaerobic respiration
- so it produces only carbon dioxide and water
how can we obtain the ethanol in the mixture with water
- fractional distillation
- chemically absorb the last small amount of water
what is a carboxylic acid
carboxylic acids form a homologous series of compounds
what do the names of carboxylic acids end in
anoic
what functional group do all carboxylic acids have
= O
C
- O - H
carboxyl
true or false: carboxylic acids have similar chemical properties
true
true or false: carboxylic acids don’t have similar chemical properties
false
