AQA · Chemistry · 8462
GCSE Chemistry (AQA): Esters
Topic 7 — Organic Chemistry. Generated from the caption track of Cognito's lesson video "GCSE Chemistry - Esters (2026/27 exams)"; each card deep-links to the moment in the video it came from. Lesson 7.15 of Cognito's AQA GCSE Chemistry (Triple) course (Higher tier), filed under AQA Chemistry 8462. Teaching by Cognito — https://cognitoedu.org/coursesubtopic/c2-gcse-aqa-h-t_7.15.
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What is the byproduct when a carboxylic acid reacts with an alcohol?
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Water.
Which catalyst is normally used in the formation of an ester?
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Concentrated sulfuric acid — an acid catalyst that speeds up the reaction.
Which atoms combine to form the water molecule in esterification?
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The OH group lost by the carboxylic acid and the hydrogen lost from the alcohol's OH group.
Which two types of compound react together to form an ester?
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A carboxylic acid and an alcohol.
What does it mean that esters are volatile?
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They evaporate easily.
Which part of the carboxylic acid is lost when an ester forms?
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Its OH group.
How are the smells of esters typically described?
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Pleasant — often sweet or fruity.
The COO group is also called the ester ?, because it joins the carboxylic acid to the alcohol.
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link
Which carboxylic acid and alcohol are used to make ethyl ethanoate?
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Ethanoic acid and ethanol.
What is the functional group of an ester?
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The COO group (also called the ester group or ester link).
Why are esters used in perfumes and food flavourings?
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They have pleasant, sweet or fruity smells and are volatile, so they evaporate easily and reach the nose.
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