SC23c Carboxylic Acids

Question 1

carboxylic acids in order

Answer 1

methanoic acid, ethanoic acid, propanoic acid and butanoic acid

Question 2

molecular formula of methanoic and ethanoic acid

Answer 2

methanoic acid, HCOOH
ethanoic acid, CH₃COOH

Question 3

molecular formula for propanoic and butanoic acid

Answer 3

propanoic acid, C₂H₅COOH
butanoic acid, C₃H₇COOH

Question 4

structural formula for methanoic acid

Answer 4

H-C=O
. O-H

Question 5

structural formula for ethanoic acid

Answer 5

. H
H-C-C=O
. H O-H

Question 6

structural formula for propanoic acid

Answer 6

. H H
H-C-C-C=O
. H H O-H

Question 7

structural formula of butanoic acid

Answer 7

. H H H
H-C-C-C-C=O
. H H H O-H

Question 8

functional group of carboxylic acids

Answer 8

-COOH

Question 9

general formula of carboxylic acids

Answer 9

CₙH₂ₙ₊₁COOH

Question 10

word equation for oxidising ethanol

Answer 10

ethanol + oxygen → ethanoic acid + water​

Question 11

chemical properties of carboxylic acids? 4

Answer 11

~form solutions with a pH less than 7
~react with metals to form a salt and hydrogen
~react with bases to form a salt and water
~react with carbonates to form a salt, water and carbon dioxide

Question 12

what happens when methanoic acid loses its hydrogen?

Answer 12

forms methanoate ions CH₃COO-

Question 13

what is a -anoate ion and how does it form?

Answer 13

a salt, forms when a carboxylic acid loses its hydrogen

Question 14

propanoic acid + magnesium —>

Answer 14

magnesium propanoate + hydrogen