As for your first question, it is balanced correctly. I just had a test and the question was: Butane (C4
) is ignited. And we were supposed to put the equation (balanced) and what kind of reaction it was plus the products. I put the same thing, and I got that one right... I'm holding it out in front of me now.
As for your second question-- you need to know the Solubility Rules (Google it, there is tons of info on it). When you do look it up, you'll find that NaNO3
will be a salt, if you were to do the reaction so it would definitely be soluble. But off of the Solubility Rules, Sodium and Nitrate are both soluble. You'd see that Phosphate is soluble, just like Nitrate, but lead is "low solubility (insoluble)". So, the Sodium Nitrate will be soluble, while the precipitate will be Lead III Phosphate.
Here's a great chart for those Solubility Rules: http://www.ausetute.com.au/solrules.html
Sorry my writing is terrible, I am about to leave, but I just had to answer you
. Hopefully I made sense haha.