Chemistry: Post your doubts here!

[nehaoscar]

Why is it the same??

 

[asadalam]

Why is it the same??

I think its enthalpy change per mole H20 formed,as same moles formed and enthalpy of neutralisation is mostly 56-57 its C.

 

[nehaoscar]

How is 2 correct? Why are they both metals?
And why is 3 wrong? They both form +2 so can they not be in the same group?

 

[nehaoscar]

Why is 2 correct?

 

[nehaoscar]

I know why only 2 and 3 are correct but i want to know where will the Ca join on?
Like Na joins the COO- , where will Ca join since it requires -2 charge to join??

 

[asadalam]

How is 2 correct? Why are they both metals?
And why is 3 wrong? They both form +2 so can they not be in the same group?

Transition elements.Cu and Mg can have +2 but they arent in same group

 

[asadalam]

I know why only 2 and 3 are correct but i want to know where will the Ca join on?
Like Na joins the COO- , where will Ca join since it requires -2 charge to join??

I think it doesnt join it forms an ionic bond like electron transfer and thats all.

 

[fantastic girl]

I know why only 2 and 3 are correct but i want to know where will the Ca join on?
Like Na joins the COO- , where will Ca join since it requires -2 charge to join??

take butanedioc acid
HOOC-(CH2)2-COOH
it will form CaOOC-(CH2)2-COOCa

 

[nehaoscar]

Why NOT A?

 

[nehaoscar]

Transition elements.Cu and Mg can have +2 but they arent in same group

And why does it show that they are metals?

 

[fantastic girl]

Why NOT A?

Al cannot boil nd melt at such low values xP

 

[nehaoscar]

How to do this one/??

 

[nehaoscar]

How to do this??

 

[nehaoscar]

Why would the ratio be 3:1??

 

[nehaoscar]

Why is 3 wrong? If something can form H-bonds then it will mix right?

 

[nehaoscar]

Why would 3 also occur?

 

[princess Anu]

why is C wrong?? help plss
I do get 3 alkenes with it :s

 

[The Sarcastic Retard]

How to do this one/??

Sr(NO3)2 ------> SrO + 2NO2 + 1/2 O2
n of Sr(NO3)2 =0.014
n of 2NO2 + O2 = 0.014

 

[asadalam]

And why does it show that they are metals?

Because they form cations

 

[The Sarcastic Retard]

Why is 3 wrong? If something can form H-bonds then it will mix right?

They mix due to PD PD attraaction not coz of H2 bonding..