Please help!

Chemistry

1 answer:

Viktor [21]2 years ago

6 0

Answer:

3.141592653589793236 the numbers of pie.

Also yes her model correctly shows.

What could be correct about her model is that all substances are different properties of the stating substance and also all substances match.

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When solid water changes directly to water vapor without first becoming a liquid, the process is called?

Evgen [1.6K]

Sublimation. Sublimation is the change of a solid direct to gas or vapour without becoming liquid

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2 years ago

Which acid could not be prepared by treating a Grignard reagent with CO2?

Anni [7]

Answer:

4-oxopentanoic acid.

Explanation:

In this case, we must remember that the Grignard reaction is a reaction in which carbanions are produced. Carboanions have the ability to react with CO2 to generate a new C-C bond and a carboxylate ion. Finally, the acid medium will protonate the carboxylate to produce the carboxylic acid group. 

The molecules that can follow the mechanism described above are the molecules: p-methylbenzoic acid, cyclopentane carboxylic acid and 3-methylbutanoic acid. (See figure 1)

In the case of 4-oxopentanoic acid, the possible carbanion will attack the carbonyl group to generate a cyclic structure and an alcohol group (1-methylcyclopropan-1-ol). Therefore, this molecule cannot be produced by this reaction. (See figure 2)