AAMC 8 Passage - Need major help

[AOT11]

I got a 13 on PS on AAMC 8 but this passage killed me. I remember on a previous exam, there was a similar question like "which gas bubbles out" that I did not understand either. I think my problem is this - I don't know what reactions are going on! I read TBR gen chem and I don't remember them actually focusing on any kinds of reactions. How do I approach this? I'm not looking for answers since AAMC provided them. I just hate these kinds of problems because I don't know what reaction is going on. Thanks for any help

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[MedPR]

39: This is a limiting reagent calculation. The passage tells you that you mix X amount of NiSO4 and X amount of Na2CO3. Write the balanced equation and find the limiting reagent. TBR has a good discussion on this process if you don't know it.

40: Carbonate reacts with acid to form carbon dioxide and water. This is a physiologic reaction as well; one you should know. If you see a reaction with carbon and oxygen, you can almost always bet CO2(g) is going to be formed.

41: Color comes from d-orbitals of transition metals. Just something you need to know.

 

[fas376]

39: This is a limiting reagent calculation. The passage tells you that you mix X amount of NiSO4 and X amount of Na2CO3. Write the balanced equation and find the limiting reagent. TBR has a good discussion on this process if you don't know it.

40: Carbonate reacts with acid to form carbon dioxide and water. This is a physiologic reaction as well; one you should know. If you see a reaction with carbon and oxygen, you can almost always bet CO2(g) is going to be formed.

41: Color comes from d-orbitals of transition metals. Just something you need to know.

I also had trouble with the passage. And wow at number 41 - is that seriously something we're supposed to know? I went through TBR Gen Chem and don't ever remember seeing that.

 

[t0ny]

Yeh I saw that in my inorganic chemistry class. With the color coming from d orbital splitting into 2 different energy levels. As long as the 2 energy levels and their electrons don't go against the "spin forbidden" rule or the other that I don't remember your color will be intense. If it goes against one of the 2 rules it will be a lighter color and if it goes against both rules it will be colorless.

This might not be very specific but it's the gist of it.

 

[MedPR]

I also had trouble with the passage. And wow at number 41 - is that seriously something we're supposed to know? I went through TBR Gen Chem and don't ever remember seeing that.

Pretty sure I learned it in TBR, but who knows.

 

[pfaction]

I also had trouble with the passage. And wow at number 41 - is that seriously something we're supposed to know? I went through TBR Gen Chem and don't ever remember seeing that.

TPR mentions this OVER AND OVER and makes a point to refer to it in their passages as questions.