Destroyer qusetions GC

[jdent]

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1. In question #86 when he does the calculation in the back where does he get the [HN3] to be 1*10^-1?
2. In question 87 Ag is also a transition metal?
3. In question 88- could some one explain how catalyst will change the reaction mechanism. I thought that it just lowers activation energy. Iguess im wrong but why?

 

[wifi08]

for question #3. a catalyst also changes the mechanism. an example is in fisher esterification, the carbonyl becomes an alcohol group in the intermediate. the H which attaches is from the acid catalyst. this is how a catalyst can change reaction mechanism

 

[jdent]

Anybody able to please help me out?

 

[Mstoothlady2012]

Anybody able to please help me out?

okay I guess I will help you out since I am so nice and all 😀

86) Read answer choice D carefully. It says that 0.1 M of NH3, which is same as 1 x 10^-1

87) yea you are right Ag is also transitional metal. But not all transition metals give color, plus remember Ag precipitates so even if it does produce color, it would precipitate out and wouldn't produce that intense of a color. But I am pretty sure Ag doesn't produce color. Its silver!

88) yea you are right! it does decrease activation energy. It changes reaction mechanism because forms a more stable transition state, which otherwise without the catalyst you wouldn't form.

Hope this helps!

 

[PooyaH]

1. In question #86 when he does the calculation in the back where does he get the [HN3] to be 1*10^-1?
2. In question 87 Ag is also a transition metal?
3. In question 88- could some one explain how catalyst will change the reaction mechanism. I thought that it just lowers activation energy. Iguess im wrong but why?

1. Look at choice D and see the number as the concentration of NH3
2.Yes Ag is a transition metal but you need to remember that AgCl is insoluable!!!
3. One thing catalyst do not change is the equilibrium of reaactions, but they do change the reaction mechanism and they speed up the reaction by lower the activation energy.