Lesson 3.3.9.1
3.3.9.1 Carboxylic acids and esters Quiz: AQA Chemistry, Unit 3
20 questions
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Lesson 3.3.9.1, Carboxylic acids and esters: 20 multiple choice questions for the AQA Chemistry (7405), Unit 3: Organic chemistry, written with Revision Ninja.
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The 20 questions
-
Which functional group linkage is present in all esters?
- -COOH-
- -COC-
- -COO-
- -CHO-
-
What is the other product when a carboxylic acid and an alcohol form an ester with an acid catalyst?
- Carbon dioxide
- Sodium chloride
- Water
- Hydrogen
-
Which alcohol forms the ester backbone of vegetable oils and animal fats?
- Ethan-1,2-diol
- Propane-1,2-diol
- Propan-1-ol
- Propane-1,2,3-triol
-
Biodiesel is produced by reacting vegetable oils with which alcohol in the presence of a catalyst?
- Butan-1-ol
- Propan-2-ol
- Methanol
- Ethanol
-
What carboxylate product is formed by the alkaline hydrolysis of fats?
- Ester
- Fatty acid
- Glycerol
- Soap
-
Which compound is formed from ethanoic acid and ethanol with an acid catalyst?
- Ethyl ethanoate
- Propyl ethanoate
- Methyl propanoate
- Ethyl methanoate
-
Which carboxylic acid forms during the acid hydrolysis of ethyl ethanoate?
- Butanoic acid
- Propanoic acid
- Ethanoic acid
- Methanoic acid
-
Which carboxylate salt forms during the alkaline hydrolysis of ethyl ethanoate with NaOH?
- Sodium propanoate
- Sodium ethanoate
- Sodium methanoate
- Sodium butanoate
-
What is the relative molecular mass of ethyl ethanoate, C4H8O2, using Ar C = 12, H = 1 and O = 16?
- 88
- 60
- 102
- 74
-
How many fatty acid molecules are released when one triglyceride is fully hydrolysed in alkali?
- 4
- 3
- 1
- 2
-
How many methanol molecules react with one triglyceride to form biodiesel?
- 2
- 1
- 4
- 3
-
Why does ethyl ethanoate have a lower boiling point than ethanoic acid?
- No hydrogen bonding
- Spherical molecules
- Higher molecular mass
- Stronger ionic forces
-
Which ester is formed from propanoic acid and butan-1-ol?
- Butyl ethanoate
- Propyl propanoate
- Butyl propanoate
- Propyl butanoate
-
How can the yield of an ester be increased during acid-catalysed esterification?
- Add water
- Remove water
- Remove alcohol
- Add ester product
-
What is the name for the alkaline hydrolysis of a fat to make soap?
- Esterification
- Saponification
- Halogenation
- Hydration
-
Why is a separating funnel used during the preparation of an ester?
- Distil volatile liquid
- Separate liquid layers
- Measure boiling point
- Filter solid residue
-
Ethanoic acid (0.10 mol) reacts with excess ethanol and forms 0.06 mol of ethyl ethanoate. What is the percentage yield?
- 40%
- 60%
- 100%
- 6%
-
What ester is formed when ethanoic acid reacts with methanol?
- Ethyl ethanoate
- Methyl propanoate
- Methyl ethanoate
- Ethyl methanoate
-
Vegetable oils and animal fats are triesters derived from which alcohol?
- Ethane-1,2-diol
- Propane-1-ol
- Propane-1,2,3-triol
- Ethanol
-
Why is the alkaline hydrolysis of an ester effectively irreversible?
- Acid catalyst degrades
- Carboxylate salt forms
- Alcohol evaporates
- Ester crystallises
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