I’m guessing you are talking about a nucleophilic substitution reaction with water though; the O has a positive charge as it has an extra Hydrogen on it
I’m guessing you are talking about a nucleophilic substitution reaction with water though; the O has a positive charge as it has an extra Hydrogen on it
sorry pls find it attached now. its the bit after the second arrow im confused about
sorry pls find it attached now. its the bit after the second arrow im confused about
The O has got a positive charge because a H from the H2SO4 came WITHOUT its electron (i.e. it was an H+ ion) (the HSO4- kept hold of this). One of the lone pairs on the oxygen formed a dative bond to this positive H. Now the positive charge is shared over the -OH2 group..we show it on the diagram as just sitting on the oxygen atom...
The O has got a positive charge because a H from the H2SO4 came WITHOUT its electron (i.e. it was an H+ ion) (the HSO4- kept hold of this). One of the lone pairs on the oxygen formed a dative bond to this positive H. Now the positive charge is shared over the -OH2 group..we show it on the diagram as just sitting on the oxygen atom...
Thank you!!! But oxygen technically has a full outer shell right? If you look at my terribly draw dot and cross, it only has a lone pair of electrons right?
yes. But that H on the far left of your diagram came without its own electron (both electrons in the bond are provided by oxygen). That H has a positive proton in its nucleus, but doesn't have a negative electron to balance it-makes the molecule positively charged overall.
bit confused about the second step of the reaction. why does the O have a positive charge?
To convince yourself do some simple maths.
The oxygen has a half share of each bonding pair of electrons = 3 electrons for three bonds. It "owns" one lone pair. It has two electrons in the inner 1s orbital ------------------------------------------------------ total electrons "owned" by oxygen 3 + 2 + 2 = 7
But oxygen has a nuclear charge of +8 And each electron has a -1 charge
Hence overall it has a formal charge of -7 + 8 = +1
The oxygen has a half share of each bonding pair of electrons = 3 electrons for three bonds. It "owns" one lone pair. It has two electrons in the inner 1s orbital ------------------------------------------------------ total electrons "owned" by oxygen 3 + 2 + 2 = 7
But oxygen has a nuclear charge of +8 And each electron has a -1 charge
Hence overall it has a formal charge of -7 + 8 = +1
thank you very much btw, how do you know it has one lone pair and then another 2 electrons? because i thought oxygen has 6 on its outer shell,, it makes three bond pairs, so it has 3 left? sorry this is confusing me alot..
thank you very much btw, how do you know it has one lone pair and then another 2 electrons? because i thought oxygen has 6 on its outer shell,, it makes three bond pairs, so it has 3 left? sorry this is confusing me alot..
Oxygen is element number 8. It has eight electrons. There are two electrons in the first shell and six in the second shell. (2,6)
Every time it makes a bond to hydrogen it shares one electron of its own and one from hydrogen.
Thus in water. H2O, it has an octet of electrons in the outer shell, two shared pairs and two line pairs.
If another hydrogen ion comes along and shares one of the lone pairs, the oxygen is left with three bonding pairs and one lone pair. Overall, it has possession of only 7 electrons to balance the 8 protons in the nucleus, therefore it now has a positive charge.
Oxygen is element number 8. It has eight electrons. There are two electrons in the first shell and six in the second shell. (2,6)
Every time it makes a bond to hydrogen it shares one electron of its own and one from hydrogen.
Thus in water. H2O, it has an octet of electrons in the outer shell, two shared pairs and two line pairs.
If another hydrogen ion comes along and shares one of the lone pairs, the oxygen is left with three bonding pairs and one lone pair. Overall, it has possession of only 7 electrons to balance the 8 protons in the nucleus, therefore it now has a positive charge.
thank you so much! you're really good at explaining
Overall, it has possession of only 7 electrons to balance the 8 protons in the nucleus, therefore it now has a positive charge.
im so sorry to disturb you again, but i'm just re-reading it and got slightly confused about the very last bit.... overall why doesn't it have possession have 8e-s? as covalent bonds are the sharing of electrons?so 4 covalent bonds so it has 8 electrons?
im so sorry to disturb you again, but i'm just re-reading it and got slightly confused about the very last bit.... overall why doesn't it have possession have 8e-s? as covalent bonds are the sharing of electrons?so 4 covalent bonds so it has 8 electrons?
It shares each bonding pair and 100% owns each lone pair. ownership 3 bonding pairs = 3 electrons 1 bonding pair = 2 electrons 2 inner shell electrons ------------------------------------ total 7 electrons and 8 protons, hence it has a positive charge