Chemistry: Post your doubts here!

[nehaoscar]

Why is 3 wrong?

 

[nehaoscar]

Why would the rate decrease after some time (C)??

 

[Mathemagical]

View attachment 54546
I know that the answer is A
But i was wondering what would the product of this reaction in C be??

C is an ester. It will not react with HCN.

 

[qwertypoiu]

View attachment 54548
Why would the rate decrease after some time (C)??

How else would the reaction stop?

 

[shazmina]

View attachment 54547
Why is 3 wrong?

3 is a neutral salt but it doesnt make the water neutral....
inorder to make the acidic water neutral a basic substance have to be added to neutralise it .. therefore only 1 and 2 are right

 

[qwertypoiu]

View attachment 54547
Why is 3 wrong?

The first two options will neutralize the acid. How will potassium nitrate, a salt, react with the acid? It wouldn't.

 

[Mathemagical]

View attachment 54548
Why would the rate decrease after some time (C)??

The reactants will be used up and the rate decreases.

 

[qwertypoiu]

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How to do this?

PV = nRT
R and T are constant. So we can write:
PV = kn, where k is just a constant.
n = PV/k
Moles of gas in flask X = 2*1/k = 2/k
Moles of gas in flask Y = 1*2/k = 2/k
Total moles = 4/k
New volume together = 1+2=3
New pressure = kn/V = k * (4/k) / 3 = 4/3Pa

 

[nehaoscar]

I thought D... but it's C
Can someone summarize the 2 reactions with equations please?

 

[nehaoscar]

How is 3 also correct?
V3+ = 20 electrons = 1s2 2s2 2p6 3s2 3p6 4s2 ... so it doesn't have unpaired electrons :/

 

[nehaoscar]

How else would the reaction stop?

But the products are catalysing the reaction... so why would it need to stop?
example : A + B = C
C keeps on catalysing the reaction A + B right?

 

[Metanoia]

why is it A ?:s why are other options wrong?

 

[qwertypoiu]

But the products are catalysing the reaction... so why would it need to stop?
example : A + B = C
C keeps on catalysing the reaction A + B right?

But A and B will run out at some point

 

[Mathemagical]

View attachment 54550
I thought D... but it's C
Can someone summarize the 2 reactions with equations please?

SO2 + Ca(OH)2 ---> CaSO3 + H2O

 

[Hiba shahid]

Hello , I wanted to ask if we can write alkyl groups such as methyl (CH3) in skeletal formula

 

[princess Anu]

PV = nRT
R and T are constant. So we can write:
PV = kn, where k is just a constant.
n = PV/k
Moles of gas in flask X = 2*1/k = 2/k
Moles of gas in flask Y = 1*2/k = 2/k
Total moles = 4/k
New volume together = 1+2=3
New pressure = kn/V = k * (4/k) / 3 = 4/3Pa

Can't we find moles like
vol given/24 .. i.e...(1/24 + 2/24)?

 

[nehaoscar]

But A and B will run out at some point

So even if they hadn't mentioned the product catalysing the reaction, the graph would still look the same as the reactants would eventually run out right.?

 

[nehaoscar]

Hello , I wanted to ask if we can write alkyl groups such as methyl (CH3) in skeletal formula

Yes
For example:

 

[nehaoscar]

What would each give as a result with C?

 

[nehaoscar]

Does LiAlH4 give nascent hydrogen?