3.6 Alcohols, carboxylic acids and esters Flashcards Preview

GCSE Chemistry 11L1 > 3.6 Alcohols, carboxylic acids and esters > Flashcards

Flashcards in 3.6 Alcohols, carboxylic acids and esters Deck (35)
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1

How are carboxylic acids formed?

By the oxidisation of alcohols

2

What are the two ways that alcohols can be oxidised?

1. Through microbial action
2. Reacting with a chemical oxidising agent

3

What is an example of a chemical oxidising agent?

Potassium Dichromate

4

What acid is the main part of vinegar?

Ethanoic acid

5

What sort of pH do carboxylic acids have and why?

High pH values for acids. This is because the only partially ionise.

6

What substance is formed by the oxidisation of ethanol?

Ethanoic acid

7

Why does the fermentation of beer and wine have to take place in the absence of air?

The oxygen in air would react with the acids to cause a carboxylic acid to form.

8

What is the formula of methanoic acid?

HCOOH

9

What is the formula of ethanoic acid?

CH3COOH

10

What is the formula of propanoic acid?

C2H5COOH

11

What does ethanoic acid smell of?

Vinegar

12

What colour does universal indicator paper go when dipped in ethanoic acid?

Orange

13

What is a carboxylic acid?

A weak acid that only partially ionises in a solution

14

What pH do alcohols have when dissolved in water and why?

A neutral pH, because they can't gain or lose hydroxide (OH) ions

15

What happens when you add sodium to alcohols?

Effervescence as hydrogen is being given off. This can be tested with the squeaky pop.

16

What solvents are alcohols used for?

Medicines, perfume and cosmetics

17

Why are alcohols good solvents in perfume?

Because they evaporate quickly from the skin

18

Do alcohols burn well in air?

Yes they burn well in air in a combustion reaction

19

What is the reaction when alcohols combust?

Alcohol + oxygen ----> carbon dioxide + water

20

Are alcohols dangerous?

Ethanol is toxic in large amounts but others are even more dangerous; they can cause death in small amounts

21

What are the advantages of using alcohols as fuels?

They're renewable and carbon neutral

22

What are two examples of alcoholic fuels?

Methylated spirit is used in camping stoves
Ethanol is used as car fuel

23

What is the general formula for alcohols?

CnH2n+1OH

24

What is the functional group for alcohols?

-OH

25

What series do the different alcohols form together?

A homologous series

26

Name the first three alcohols in order of increasing number of carbon atoms

Methanol
Ethanol
Propanol

27

What do the names of all alcohols end with?

-ok

28

What kind of compounds are alcohols?

Organic compounds

29

Which alcohol does alcoholic drinks contain?

Ethanol

30

What is the formula for methanol?

CH3OH