<p>I’ve heard that the physics exam is really hard. I had a friend who took physics today, and he is literally a genius in physics, and he told me that it was very, very hard.</p>
<p>Magnesium nitride = MgN2. Germanium was the metalloid. Zinc was the metal used in galvanization and brass. SCl3 is impossible because that would require an ox. # of +3. Complex ion was the copper nitrate and ammonia (forms Cu(NH3)4 (2+)).</p>
<p>Meh. I didn’t think it was too hard and I’m more of a chemistry guy.</p>
<p>@orbdas isn’t magnesium nitride mg3n2? it isn’t just simple synthesis like that…</p>
<p>yeah: [Magnesium</a> nitride - Wikipedia, the free encyclopedia](<a href=“http://en.wikipedia.org/wiki/Magnesium_nitride]Magnesium”>Magnesium nitride - Wikipedia)</p>
<p>i was about to link that haha… what did u guys get for strongest base?</p>
<p>can someone make a list of all the answers so far?</p>
<p>@Swag4days co3 2-… oh- is the weak product of the autoionization of water, the rest were conjugate bases of strong acids w/ negligible basicity</p>
<p>I am sorry, but OH- is the strongest base in water (and H+ is the strongest acid in water).</p>
<p>what about NH3? isnt that also a base?</p>
<p>NH3 is a weak base. Weaker than CO32-</p>
<p>I’m getting really confused with the OH- and CO3 2- question 
Does anyone remember what exactly it was asking? Bronsted base? or Just base?</p>
<p>@nsojori09 it was asking for the strongest bronsted-lowry base.</p>
<p>this should clear it up: <a href=“http://www.flinnsci.com/store/catalogPhotos/AP7042cat.jpg[/url]”>http://www.flinnsci.com/store/catalogPhotos/AP7042cat.jpg</a>
lowest Ka means weakest acid and strongest base (OH-)</p>
![http://www.flinnsci.com/store/catalogPhotos/AP7042cat.jpg[/url]](http://www.flinnsci.com/store/catalogPhotos/AP7042cat.jpg%5B/url%5D){kind=link}
<p>For the first part of the test, where you had to classify the reactions, which one was the ox-red one? Nh3 one?</p>
<p>no, i think it was the zinc and copper sulfate or something</p>
<p>It was the zinc and copper one</p>
<p>was one question “an acid-base reaction involving no visible change” and was the answer NaOH and H3PO4?</p>
<p>i thinks so, whichever one didn’t make carbonic acid and i think there were only two acid-base reactions</p>
<p>It was the one with HCl and NaOH I think.</p>