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Chemistry: Post your doubts here!

nehaoscar

nehaoscar

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upload_2015-6-3_13-25-53.png
I know there are 2 ketones
But the answer is C - 3
so how does the double bond inside the cyclohexane break to form what?
 
nehaoscar

nehaoscar

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Mathemagical said:
There is a double bond to the right. Upon addition of hot KMnO4 a ketone will be formed.
Click to expand...
Will the ketone be shared between the 2 carbons in the ring? Since it's in a ring it already has 3 bonds when the double bond breaks so will the ketone be formed between the 2 carbons?
 
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shazmina

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Assalamu alaikum ...
Can someone please explain me this question ...

Which compounds would be formed in the reaction of ethene with aqueous bromine in the presence of sodium chloride?
1 CH2ClCH2Cl
2 CH2BrCH2Cl
3 CH2BrCH2Br

The Answer is C
 
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shazmina

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Help please ...................
A 2 g sample of hydrogen at temperature T and of volume V exerts a pressure p. Deuterium, 2 1H, is an isotope of hydrogen. Which of the following would also exert a pressure p at the same temperature T ?

A 2 g of deuterium of volume V
B 4 g of deuterium of volume V/2
C a mixture of 1 g of hydrogen and 2 g of deuterium of total volume V
D a mixture of 2 g of hydrogen and 1 g of deuterium of total volume 2V

The Answer is C
 
nehaoscar

nehaoscar

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shazmina said:
Help please ...................
A 2 g sample of hydrogen at temperature T and of volume V exerts a pressure p. Deuterium, 2 1H, is an isotope of hydrogen. Which of the following would also exert a pressure p at the same temperature T ?

A 2 g of deuterium of volume V
B 4 g of deuterium of volume V/2
C a mixture of 1 g of hydrogen and 2 g of deuterium of total volume V
D a mixture of 2 g of hydrogen and 1 g of deuterium of total volume 2V

The Answer is C
Click to expand...
Deuterium, 2 1H as you can see has an Mr of 2

2g of Hydrgen = 2/1 = 2moles
Using the equation pv=nRT

A = 2g = 2/2 = 1 mole at same V so different values so not correct

B = 4g/2 = 2mol but 2V so not correct

C = 1/1 = 1 mol oh H and 2/2 = 1 mol of Deuterium
Total mol = 2mol and same V = correct

D = 2/1 = 2mol of H and 1/2 = 0.5mol of Deuterium so not correct
 
nehaoscar

nehaoscar

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upload_2015-6-3_15-48-36.png
If Boron has only 3 electrons in it's outer shell, how does it form a bond with N while being bonded to 3F? :p
 
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shazmina

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nehaoscar said:
View attachment 54473
How to do this one?? A
Click to expand...
5dm3 of water contain 14g of the fertiliser as per the question ..

We alredy know that 100g of fertiliser contains 15g of nitrogen ... this is also known to us
therefore find in 14g of fertilizer what is the amount of nitrogen it contains ..ie 2.1g
then find the mole for it which is 2.1 divided by 14 .. which is 0.15 moles of nitrogen in 14g of fertiliser

Now we know that 0.15 moles of nitrogen is present in 5dm3 of water .. there fore now find for 1 dm3 of water .. which is 0.03
 
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