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Aldehydes and Ketones
Hook:
A quick lab with easy to use chemicals.
Materials:
Vanilla
Cinnamon
Spearmint oil
Jasmine
Process: See if the students recognise any of the scents.
All of the above are ketones or aldehydes!
Pedagogy:
Similar to ethers and alcohols
Note that aldehydes and ketones are different due to reactivity
Ketones react significantly less than aldehydes, because aldehydes have the C=O group which is unprotected by the rest of a carbon chain on one side.
Explain nomenclature with examples (such as propanone, pentan-2-one, butanal)
Note memory trick for distinguishing ketones and aldehydes: ketONE, ALdehyde for the suffix.
For remembering which has the C=O group in middle, the following memory trick can be helpful: Ketones (KEY-tones) have the C=O in the middle of the chemical, like a key goes in the middle of a lock
Consolidation:
Finish up the lab!
Show the structures of each chemical and give the students a piece of paper to identify each structure as either a ketone or aldehyde (they don't have to write their names down) to check and make sure that the students understand which chemicals are aldehydes and which are ketones.
A quick lab with easy to use chemicals.
Materials:
Vanilla
Cinnamon
Spearmint oil
Jasmine
Process: See if the students recognise any of the scents.
All of the above are ketones or aldehydes!
Pedagogy:
Similar to ethers and alcohols
Note that aldehydes and ketones are different due to reactivity
Ketones react significantly less than aldehydes, because aldehydes have the C=O group which is unprotected by the rest of a carbon chain on one side.
Explain nomenclature with examples (such as propanone, pentan-2-one, butanal)
Note memory trick for distinguishing ketones and aldehydes: ketONE, ALdehyde for the suffix.
For remembering which has the C=O group in middle, the following memory trick can be helpful: Ketones (KEY-tones) have the C=O in the middle of the chemical, like a key goes in the middle of a lock
Consolidation:
Finish up the lab!
Show the structures of each chemical and give the students a piece of paper to identify each structure as either a ketone or aldehyde (they don't have to write their names down) to check and make sure that the students understand which chemicals are aldehydes and which are ketones.