what is the functional group of carboxylic acids?
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CARBOXYLIC ACIDS [dchemlc]
9th Grade
•10 Qs
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CARBOXYLIC ACIDS [dchemlc]
Quiz
•
Chemistry
•
9th Grade
•
Hard
Miyuni Thisanga De Almeida
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Answer explanation
carboxylic acids all contain the functional group -COOH.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
what is the carboxylic acid present in vinegar?
ethanoic acid
methanoic acid
propanoic acid
butanoic acid
Answer explanation
The most familiar one is ethanoic acid (old name acetic acid). Vinegar is an aqueous solution containing ethanoic acid.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
how is propanoic acid produced?
by the oxidation of propanol
by the oxidation of ethanol
by the oxidation of propene
by the oxidation of propane
Answer explanation
Carboxylic acids are formed by oxidation of the corresponding alcohols.
4.
FILL IN THE BLANK QUESTION
30 sec • 1 pt
name the given carboxylic acid
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
if a blue litmus paper was dipped in a carboxylic acid, what would be the colour produced?
red
blue
purple
green
Answer explanation
Ethanoic acid and the other carboxylic acids are weak acids with a pH of about 3-5, depending on the concentration of the solution. They will turn blue litmus paper red, and react with all the things you expect acids to react with.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
what is the pH range of carboxylic acids?
3 - 5
1 - 3
5 - 7
7 - 9
Answer explanation
Ethanoic acid and the other carboxylic acids are weak acids with a pH of about 3-5.
7.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
dilute ethanoic acid reacts with magnesium with a lot of fizzing to produce
magnesium ethanoate
hydrogen
oxygen
carbon dioxide
magnesium ethanoic acid
Answer explanation
dilute ethanoic acid reacts with magnesium with a lot of fizzing to produce a salt and hydrogen. The salt formed is magnesium ethanoate, which is soluble in water and so you get a colourless solution:
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