Posted by alexandra_k on April 29, 2009, at 13:19:28
So I thought I was getting the difference between ionic / extravalent bonds and covalent bonds but now I'm confused again...
NaCl is an example of an extravalent bond because Sodium DONATES one electron to Clorine to satisfy the octet rule.
H2 is an example of a single covalent bond because two elements of Hydrogen SHARE one electron (one pair of electrons) to satisfy the octet rule.
C02 is an example of a double covalent bond because two elements of oxygen SHARE two pairs of electrons with carbon to satisfy the octet rule.
H20 is an example of a double covalent bond because two elements of Hydrogen SHARE two pairs of electrons to satisfy the octet rule.
But then apparently 'water molecules dissociate continually in a reversible reaction to form hydrogen ions (H+ and hydroxide ions (OH-):H20 <--> H+ + OH-
Hmm.
But then does H2 similarly dissociate continually in a reversible reaction to form hydrogen ions (H+ and H-)?
And then do carbon dioxide molecules dissociate continually in a reversible reaction to form carbon ions and hydrogen ions (C- and 2O+)?
If so... Then I lose the distinction between extravalent bonds and covalent bonds (donating vs sharing).
Does this have something to do with problems locating electrons in clouds?
Is this basically an issue of 'don't worry about it just keep going and learn about carbs / proteins / lipids'?
poster:alexandra_k
thread:893467
URL: http://www.dr-bob.org/babble/social/20090421/msgs/893467.html