闪卡自测
What are esters?
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闪卡 1
问题
What are esters?
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答案
Esters are compounds with the functional group R-COO-R. They are sweet-smelling oily liquids used in food flavorings and perfumes.
闪卡 2
问题
How are esters made?
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答案
Esters are made by the reaction between alcohols and carboxylic acids in an esterification reaction.
闪卡 3
问题
Give an example of an esterification reaction.
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答案
Ethanoic acid will react with ethanol in the presence of concentrated sulfuric acid (catalyst) to form ethyl ethanoate: CH3COOH + C2H5OH → CH3COOC2H5 + H2O
闪卡 4
问题
How are esters named?
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答案
The first part of the name indicates the length of the carbon chain in the alcohol, and it ends with the letters '-yl'. The second part indicates the length of the carbon chain in the carboxylic acid, and it ends with '-oate'.
闪卡 5
问题
Name the ester formed from pentanol and butanoic acid
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答案
The ester formed from pentanol and butanoic acid is called pentyl butanoate.
闪卡 6
问题
Write the formula of the ester functional group.
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答案
The formula of the ester functional group is R-COO-R.
闪卡 7
问题
Define an esterification reaction
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答案
A reaction between an alcohol and a carboxylic acid to form an ester.
闪卡 8
问题
What catalyst is needed for esterification reactions?
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答案
Concentrated sulfuric acid is used as a catalyst for esterification reactions.
闪卡 9
问题
How is ethyl ethanoate formed?
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答案
Ethyl ethanoate is formed by the reaction between ethanoic acid and ethanol.
闪卡 10
问题
True or False? Esters have low boiling points.
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答案
True. Esters have low boiling points, making them volatile.