Which equation shows a physical change?
2 answers:
<u>Answer:</u> The correct equation is
<u>Explanation:</u>
A physical change is defined as the change in which there is change in shape and size of the object and no change in the chemical composition of the substance. In this process, no new substance gets formed.
A chemical change is defined as the change in which chemical composition of the substance gets changed and new substance gets formed.
From the given options:
In first three options, new substances are getting formed and hence they are considered as a chemical change.
Only in last option, there is change in the physical state of matter that is change from gaseous state to solid state. No new substance is getting formed.
Hence, the correct equation is
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Answer:
Reagent A: PBr₃
Reagent B: Mg in Et₂O.
Explanation:
Hello,
In this case, your facing a problem in which a carboxylic acid is produced starting by an alcohol. More specifically, cyclopentanol must react with phosphorous tribromide in order to yield bromocyclopentane which is more likely to produce a carboxylic acid, therefore, reagent A is PBr₃.
On the other hand, by means of the production of the specified product, bromocyclopentane must react with carbon dioxide and magnesium in diethyl ether in acidic media to promote the production of the cyclopentanoic acid via the grignard reaction (substitution of the bromine by the carboxyle group), therefore, reagent B is Mg in Et₂O.
Best regards.
