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posted by  MzKlassy on 10/12/2008 12:57:12 PM  |  status: Closed  

Please help me understand how to clasify the following bonds as "ionic, polar covalent, and non polar covalent" Thank You

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General Chemistry N/A N/A N/A
Question Details:
Please help me understand why these bonds are ionic, polar covalent, or non poloar covalent:
 
PdCl2
 
BBr3
 
NaOH:
Na+ - OH-
 
NaOH:
OH-
 
CH3Li
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posted by shynae06 on 10/12/2008 1:26:30 PM  |  status: Live
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An ionic bond is formed where there is a transfer of electrons, causing one atom to become a positively charged ion and the other  to become a negatively charged ion...
 
A polar covalent bond id a covalent bond between atoms of different electronegativities.
 
A non-polar covalent bond is a bond formed between two atoms that share the bonding electrons equally.
 
PdCl2 - Ionic bond
 
BBr3 - covalent bond
 
NaOH: Non-polar
Na+ - OH-
 
NaOH: ?
OH-
 
CH3Li - Covalent bond
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posted by rapunzel on 10/12/2008 1:49:40 PM  |  status: Live
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"Thank you so much that helped me understand it totally"
Response Details:
Think of it as two kids fighting over a candy bar.  Imagine the kids are each pulling on one side of a bar.  If one kid is a lot stronger than the other, he will take the bar and will be very happy.  This is an ionic bond where the bar is an electron and the kids are atoms.  This is the strongest bond.  If the kids are the same size exactly, ie the same electronegativity, they will each pull on the bar and will reach a stalemate.  They will both eventually get tired, so this is not a very strong bond - non polar covalent - this is only true when an atom is bonded to an atom of the same type.  Similarly, when one kid is slightly stronger than other, the bond will be weak because they will struggle and get tired.  This is non polar covalent.
 
Ionic bonds occur when there is a transfer of electrons between atoms on either side of the periodic table, or between an element and a polyatomic group.
 
Covalent bonds occur when the elements are closer on the periodic table
 
 
 
PdCl2 - Ionic
 
BBr3 - polar covalent
 
NaOH: Ionic (O-H is polar covalent, Na-OH is ionic)
Na+ - OH-
 
NaOH: Same as above
OH-
 
CH3Li - Polar Covalent bond
 
(The only example for nonpolar covalent would be H2, Br2 or the like)
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posted by borden on 10/12/2008 2:21:28 PM  |  status: Live
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Bonding strength is all about electronegativity. You take the electronegativity of two atoms you are interested in.
Here are the general rules
1.If electronegativity is 1.9 or greater after taking the difference, it is a ionic compound. Typically, ionic compounds are products of metals(low electornegativity) and nonmetals(high electronegativity) example NaCl.
 
2 If difference is between 0 and .5, it is a colvaent bond. example CH
 
3. If difference is between .5 and 1.9, it is a polar covalent bond Example, H2O.  Remember, the trends of electronegativity, it increases as you go across a row on the periodic table. It decreases as you go down a column on the periodic table.
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