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Chemistry: Post your doubts here!

nehaoscar

nehaoscar

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upload_2016-1-12_20-8-47-png.58809

How is the mechanism nucleophilic substitution?
The CH3-CH2 attaches to the NH removing HBr, and the CH2 has a positive delta... so wouldn't it be electrophilic...
Please explain why it's nucleophilic :/
 
D

donewithtime80

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The combustion of ethanol is an exothermic reaction. This reaction occurs spontaneously at low temperatures but does not occur at very high temperatures. Explain why.

Ans: As temperature increases T∆S is more negative or –T∆S increases
At high temperature T∆S is more negative than ∆H (so ∆G is positive)

please explain this.
 
M

My Name

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ruby_fern said:
Can someone pls explain what this question is asking?
View attachment 58909
Click to expand...
It's asking the electronic structure.You need to complete the configuration.
You know that Fe has 26 electrons.And Fe 3+ would mean it has 3 electrons less which is going to be 23.
Argon has 18 electrons.You need to write your answer after that Argon one.
So it'll be like this:
Fe -> 4s2 3d6 (26 electrons,the 18 of argon plus the 8 to get the 26)
Fe3+ -> 3d5 ( see 3 less)
 
ruby_fern

ruby_fern

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The Sarcastic Retard said:
You are asked to write electronic structure for Fe and Fe3+. [Ar] means Electronic structure of argon, so u need to write electronic structure of Fe and Fe3+ after 3p6
Click to expand...
My Name said:
It's asking the electronic structure.You need to complete the configuration.
You know that Fe has 26 electrons.And Fe 3+ would mean it has 3 electrons less which is going to be 23.
Argon has 18 electrons.You need to write your answer after that Argon one.
So it'll be like this:
Fe -> 4s2 3d6 (26 electrons,the 18 of argon plus the 8 to get the 26)
Fe3+ -> 3d5 ( see 3 less)
Click to expand...

ohk thanks a lot :D
 
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