C3.6 Alcohols, Carboxylic Acids & Esters

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  • Created by: CD
  • Created on: 21-04-13 21:06
What is the formula of ethanol?
C2H5OH
1 of 18
Name the alcohol which has 3 carbon atoms in its molecules
Propanol
2 of 18
Name the products of the reaction between ethanol and sodium
Sodium ethoxide and hydrogen
3 of 18
Short chain alcohols will dissolve many compounds. This makes them useful as what?
Solvents
4 of 18
Alcohols are oxidised by acidified potassium dichromate or by oxygen in the presence of microorganisms. Ethanol is converted into which substance in this reaction? Give a use for this reaction of ethanol.
Ethanoic Acid is formed. Ethanol from fermentation of sugar can be converted into wine vinegar in this reaction.
5 of 18
Ethyl Ethanoate is an ester. It can be made by reacting which alcohol with which carboxylic acid? Why is concentrated sulfuric acid usually added to the reaction mixture?
Ethanol and ethanoic acid. The sulfuric acid acts as a catalyst to speed up the reaction.
6 of 18
What is the functional group of a carboxylic acid?
-COOH This is called a carboxyl group.
7 of 18
What is the functional group of an alcohol?
-OH This is called a hydroxyl group
8 of 18
Give one common use of an ester
Flavourings, in perfumes, solvent(e.g. ethyl ethanoate can remove chewing gum from clothing)
9 of 18
Why does wine taste sour if left open to the air for a few days?
The ethanol in the wine has been oxidised to form ethanoic acid which tastes sour.
10 of 18
What would you observe if sodium carbonate was added to a carboxylic acid?
Fizzing/effervescence. This is because carbon dioxide gas is produced. It is used as a test in organic chemistry to show a substance is acidic.
11 of 18
What would be observed if universal indicator was added to methanol?
Green colour. This is because alcohols form neutrsal solutions in water.
12 of 18
Write an equation for the complete combustion of methanol
2CH3OH + 3O2 --> 2CO2 + 4H2O Any multiple of this is also correct.
13 of 18
Why might ethanol from fermentation of sugars replace petrol as motor fuel in the future?
Petrol is made from crude oil which is non-renewable and may run out. Plant sugars are a renewable resource.
14 of 18
Complete the general word equation: Acid + Metal Carbonate -->
Salt + Carbon Dioxide + Water
15 of 18
Vinegar is a solution of ethanoic acid in water. Ethanoic acid is a weak acid. This is because it has a low concentration of hydrogen ions in aqueous solution. Which of the following is the most likely pH of vinegar? 1, 4, 7, or 10
4 Acids have a pH less than 7. The stronger the acid, the lower the pH number.
16 of 18
Name the carboxylic acid with only 1 carbon atom in its molecules.
Methanoic Acid
17 of 18
Name a caboxylic acid found in oranges, lemons and some fizzy drinks.
Citric Acid
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Other cards in this set

Card 2

Front

Name the alcohol which has 3 carbon atoms in its molecules

Back

Propanol

Card 3

Front

Name the products of the reaction between ethanol and sodium

Back

Preview of the front of card 3

Card 4

Front

Short chain alcohols will dissolve many compounds. This makes them useful as what?

Back

Preview of the front of card 4

Card 5

Front

Alcohols are oxidised by acidified potassium dichromate or by oxygen in the presence of microorganisms. Ethanol is converted into which substance in this reaction? Give a use for this reaction of ethanol.

Back

Preview of the front of card 5
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