Polydentate

[Rita Chen 1B]

How would ew determine that HN(CH2Ch2NH2)2 is polydentate? Do we need to draw it out? If so, how do you know how ot draw it?

[Rory Simpson 2F]

If you're drawing it out, the nitrogen with one H bonded together would be central and bonded to two carbons (you can pretty much figure out the order of the chain based on the order of the formula, especially if its written out at NH2CH2CH2NHCH2CH2NH2). The formal charge would be zero for everything if each carbon has 4 bonds and each nitrogen has 3 bonds and a lone pair. You can tell that it's a polydentate because of the lone pairs on each of the nitrogen atoms which can be used to form coordinate covalent bonds.