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Flashcards in C3 Organic Chemistry Deck (24)
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1

What links the three organic compounds, alcohols, carboxylic acids and esters?

Alcohols react with carboxylic acids to produce esters.

2

What does the word organic mean here?

The compound is based on the element carbon. It may contain hydrogen too.

3

What is a functional group?

The reactive bit of an organic compound.

4

What is an homologous series?

The compounds with the same functional group are arranged in order of carbon chain length.

5

What is the molecular formula of ethanol?

C2H6O

6

What is the structural formula of ethanol?

CH3CH2OH

7

What is the displayed formula of ethanol?

8

Name the first three members of the alcohol homologous series? How do their names give them away?

Methanol, ethanol and propanol, their names all end in -ol

9

What is the functional group in an alcohol?

Alcohols contain the functional group –OH

10

What are the chemical properties of alcohols?

They dissolve in water to form a neutral solution; they react with sodium to produce hydrogen; they burn in air.

11

Write an equation for the combustion of ethanol.

Ethanol + oxygen → carbon dioxide + water

C2H5OH + 3O2 → 2CO2 + 3H2O

12

What are the uses of alcohols generally?

They are used as fuels and solvents.

13

Give two specific food related uses of ethanol.

Ethanol is the main alcohol in alcoholic drinks. Ethanol can be oxidised to ethanoic acid, either by chemical oxidising agents or by microbial action. Ethanoic acid is the main acid in vinegar.

14

Name the first three members of the carboxylic acid homologous series? How do their names give them away?

Methanoic acid, ethanoic acid and propanoic acid They all end in –oic acid.

15

What’s the functional group in a carboxylic acid?

They have the functional group –COOH

16

What are the acidic properties of alcohols?

They dissolve in water to produce acidic solutions. They react with carbonates to produce carbon dioxide

17

Why are they weak acids?

They do not ionise completely when dissolved in water and so are weak acids

18

What are the uses of carboxylic acids generally?

They react with alcohols in the presence of an acid catalyst to produce esters

19

What are the uses of carboxylic acids generally?

They react with alcohols in the presence of an acid catalyst to produce esters

20

Give a food related use of ethanoic acid?

Ethanoic acid is the main acid in vinegar

21

What is the functional group in an ester?

Esters have the functional group –COO–.

22

What are the physical properties of esters?

They are volatile compounds with distinctive smells

23

What are the uses of esters?

They are used as flavourings and perfumes.

24

What is ethyl ethanoate?

Ethyl ethanoate is the ester produced from ethanol and ethanoic acid.