Chem help..... :O

ok...
what is a dative covalent bond??
i've looked through all my books, asked my teachers... etc.
and didn't get a straight answer..
can u guyz help????

Dative covalent bond is a description of covalent bonding between two atoms in which both electrons shared in the bond come from the same atom.

ohhhh
so one atom sharez its electronz with the other atom and the aother atom doesn't want to share its electronz??
like NH4????

NH4+ is ionic...not covalent. It is an exception . It acts like an ionic compound.

ahhhhhhhhhhhhh!!
i'm confuzzled man!
explain plz...

Covalent compounds usually have a negative net charge. NH4+ has a positive net charge. Therefore it acts as if it's a ionic compound (which have positive charges)

Covalent compounds are like:

SO4^-2
ClO3^-

kk
thanx ahmed...
ur a BIG help

No Prob.

I have a chem test tomorrow

Make Du3aa for me PLEASE!!

kk
inshaAllah man..

so how was it?

insha'Allah you'll get an A

and a covalent bond is a bond between nonmetallic atoms where electrons are shared ...

I am so happy, thank you all or you du3aas, I think they helped me a lot. I might have even gotten 100% Allahu A23lam, but I found it to be the test that I did the best on. Maybe beacause thsi time I actually studied lol?

Sultan Ahmed IV wrote:I am so happy, thank you all or you du3aas, I think they helped me a lot. I might have even gotten 100% Allahu A23lam, but I found it to be the test that I did the best on. Maybe beacause thsi time I actually studied lol?

WOW! Thats good l7l....I bet you got a 100 haha

The Egyptian Gazelle wrote:

Sultan Ahmed IV wrote:I am so happy, thank you all or you du3aas, I think they helped me a lot. I might have even gotten 100% Allahu A23lam, but I found it to be the test that I did the best on. Maybe beacause thsi time I actually studied lol?

WOW! Thats good l7l....I bet you got a 100 haha

Thanks Reem

np

Sultan Ahmed IV wrote:I am so happy, thank you all or you du3aas, I think they helped me a lot. I might have even gotten 100% Allahu A23lam, but I found it to be the test that I did the best on. Maybe beacause thsi time I actually studied lol?

alhamdullilah u found it easy man.... i actually made duaa 4 u..
now u have 2 make duaa 4 me coz i have a chem test on thursday...

emm ok ppl i really need help

>> Q) Sodium burns in excess Oxygen to give the solid, Y.
a) Y contains 58.97% Sodium. Find the emperical formula.
this is how i worked it out..
100-58.97= 41.03
so there is 41.03% Oxygen in Y
Sodium: 58.97/23 =2.56 moles
Oxygen: 41.03/16 =2.56 moles
and so Sodium : Oxygen = 1:1
so the emperical formula is NaO
b) The relative molecular mass of Y is 78. What is the molecular formula?
Mr of NaO:: (23x1)+(16x1) = 39
78/39 =2
2(NaO)
= Na2O2
==================================================================
i have a feeling this is all wrong... i need someone to check it for me.
thanx

the answer is always X = 2

its because burried treasure is always under a big 2

Darn I did this like 2 months ago. Anyways...

Yes they are both correct.

Ahmed IV wrote:Darn I did this like 2 months ago. Anyways...

Yes they are both correct.

yh... i did this right at da begining of da year...
i'm revising 4 my real exam which is in 2 weeks
and i like ur new profile pic by da way...


@Steve:: ahhh stop confusing me man!!

but ahmed said we were both correct

Well if you want to be 100% precise when dividing by the molar
mass of the Oxygen and Sodium you should divide by up to 4 sig figs.
The answer is still the same though.

P.S.: Thanks, ii was my first profile, before any Y!A members were here...I missed it so I got it back

Simple:

[Enthalphy of Products]-[Enthalphy of Reactants]

But wait, why does C and H2 have an enthalpy?? Could you give me their states? (solid,liquid, gas)

C is solid
H is gas

Those values are the enthalpies of formation, correct?