<p>Hey, so let’s discuss q and a for the chemistry sat subject test!!</p>
<p>What did you guys get for the first 4 questions (like normal glass, plant fetilizer…)</p>
<p>The question about cooper wire and its product in crucible</p>
<p>For the He and Xe problem, did you get TTCe</p>
<p>Did you get TTCe on the question with the water level</p>
<p>What did you guys get for the complex ion and gas formation problem?</p>
<p>What was the strongest bronsted lowery base?</p>
<p>NH3 or (Co3) 2-</p>
<p>Sorry again! !</p>
<p>NH3 is by far the stronger Bronsted base.</p>
<p>co3 (2-) is the stronger base bc i looked at the list of kb values… NOt sure how to do it any other way</p>
<p>i dont remember the complexion formation one or the others…Do you mind elaborating?</p>
<p>Yeah it is CO3, I misread NH3 for NH2.</p>
<p>The answer for the crucible question had a very silly answer…the copper dissappeared.i think the chem test was straight forward except…the stronger Lewis base question and a few others</p>
<p>There is already an “Official June SAT2 Chem thread” with at least 8 pages by now.</p>
<p>complex ion was the one with ammonia. gas formation was the one with hcl and solid something carbonate. </p>
<p>i believe those were both TTCE.</p>
<p>First 4 were:
Glass: SiO2
Protection: O3
Acid Rain: SO2/3(don’t remember)
Destroy: CCl2F2 (chlorofloro carbon)</p>
<p>What did you guys get for the lab safety one? Was it pouring water into acids?</p>
<p>Edit: Also, what was the one with wo3 + 3h2 -> w + 3h2o?</p>
<p>I said w was the oxidizing agent since it itself got reduced. Also lab safety I said sharpening glass with fire. That just sounded ridiculous to me. You should throw out sharp glass.</p>
<p>Did anyone not get the plant fertilizer question?</p>
<p>I said the lab safety was pouring water into acids because it’s supposed to be the other way around.</p>
<p>@joemama
I said that too for the tungsten question
but I think it might have been H2 is reducing agent, because WO3 is the oxidizing agent not W.
Also for lab safety I said adding water to acid - you’re supposed to add acid to water, not water to acid:
“Acid to water is how you oughta”</p>
<p>This is ridiculous. I hate to be inflammatory, but the amount of misinformation I see posted here is aggravating to me and certainly more aggravating to others who see the wrong answer and assume they got it wrong because they got something else. IF YOU ARE NOT SURE ABOUT AN ANSWER TO A QUESTION, DO NOT STATE IT AS A FACT. Not NH3 (the gold standard for a WEAK BASE), not CO3 (2-) (another commonly studied WEAK BASE), but OH- (the gold standard for a STRONG BASE) was the strongest Brønsted-Lowry base. I’m surprised that people around here talk so much about sky-high scores but they still think ammonia is a strong base. /rant</p>
<p>In my defense, I did post ~2 posts down that I had misread NH3 as NH2.</p>
<p>NH2 does not exist, but you should still know that OH- is the go-to strong base in inorganic chemistry.</p>
<p>A lot of answers, but no one correct.
The basicity in aqueous solution is related with the dissociation constant. The stronger base is one with larger constant value. To simplify calculations the value pK is often used. pK = -lg K, so this value is lower for strong bases.
The for ammonia the value pKb(NH3) = 4.75 (according to wikipedia).
The carbonate ion (CO3)2- is the conjugated base of bicarbonate ion (HCO3)-. Hence the value of basic dissociation constant can be obtained from the equation
pKb[(CO3)2-] = pKw pKa[(HCO3)-]
where Kw is water dissociation constant, pKw = 14.
pKa[(HCO3)-] = 10.3 (according to wikipedia)
pKb[(CO3)2-] = 14 10.3 = 3.7 < 4.75
Hence, the carbonate ion (CO3)2- ion is stronger base than the ammonia NH3.</p>