<p>What is the formal charge on HNO3?</p>
<p>Write formulas for the following; no need to balance, just net ionic equations:
Calcium oxide powder is added to distrilled water.
Methylamine gas is passed over hot, solid sodium oxide.</p>
<p>Here are some other questions i posted before. Please attempt them and don't let this thread die</p>
<p>H = +1
N = +5
O = -2</p>
<p>Is that right?</p>
<p>I think CH3OH is the answer since all the others dissociate completely..</p>
<p>I agree with you tentash2002. I think its CH3OH b/c CH3+ doesn't exist (at least I don't think it exists).</p>
<p>someone said: "Isn't it the other way around? H=-1, N=-5, O= -2"</p>
<p>We agree that O = -2....but you have 3 O's...so you get an overall -6 charge...you know the compound's overall charge is 0....so you need +6 charge from both H and N. H is either +1 or -1....So N could probably be +7 or +5....that's how I see it...Correct me if I'm wrong.</p>
<p>CH3OH is an alcohol -- so it won't dissociate in water</p>
<p>Scareya is right -- n is +5 if you look at the periodic table you see that it can lose 5 electron</p>
<p>here is a hint for the formal charge question. It is only one number and you need to draw Lewis Structures and determine it from there. The answers you guys are giving are probably the oxidation states on the atoms.</p>
<p>Yeah...I didn't realize that formal charge is different from oxidation numbers.</p>
<p>Lewis Structure
</a></p>
<p>H -> 1 - (.5<em>2) = 0 formal charge
N -> 5 - (.5</em>8) = 1 formal charge
O -> 6 - (2 + .5<em>4) = 2 formal charge
O -> 6 - (6 + .5</em>2) = -1 formal charge</p>
<p>Formula:</p>
<p>v = number of valence electrons
l = number of lone electrons = lone pairs * 2
b = number of electrons in bond = shared electron pairs * 2</p>
<p>Formal Charge = v - (l + .5b)</p>
<p>Is that right? I'm not too good at this formal charge stuff.</p>
<p>Does having more carbons in a chain increase the boiling point?</p>
<p>yep -- methane, ethane, propane butane pretty much gaseous, pentane and up are liquid</p>
<p>Its because the longer chains get tangled up like spaghetti
For isomers -- the more branched the chain, the lower the boiling point
so hexane will be higher than say 2methylpentane</p>
<p>scareya~ the answer is +1. Formal charge isn't really hard to do but I forgot how to do them :(. need to look it up</p>
<p>Formal charge:</p>
<p>Total electrons on atom - lone pair electrons - (1/2)*bonded pairs = formal charge of atom</p>
<p>AS the number of oxygen atoms increases in any series of oxygen acids, such as HXO, HXO2, HXO3...is it true that the acid strength increases..or is it only if X is a metal?</p>
<p>Yes the more oxygen atoms in an oxyacid, the stronger the acid is.</p>
<p>regardless if X is a metal or not???</p>
<p>well let's check it out.
HClO less soluble than HClO4...... so it works w/ non-metals</p>
<p>never heard of a acid w/ metal in it.</p>
<p>looked it up- H2CrO4- chromic acid - strong acid
H2CrO3- chromous acid - weak acid.</p>
<p>so yea. i think it's regardless of whether X is a metal or not.</p>
<p>The rules on strong and weak acids are as follows
The only strong binary acids are HCl, HBr and HI
In all other strong acids, the number of oxygens is 2 greater than the number of hydrogens e.g. H2SO3 is weak while H2SO4 is strong
All other acids are weak</p>
<p>I have a question about titration curves.</p>
<p>What causes the "rapid-rise" portion of the curve as the solution is close to approaching the equivalent point?? Why is the curve not smooth or a linear model?</p>
<p>pH is defined logarithmically; it's not linear. It is exponential.</p>
