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Altius FL5 Chem/Physics
Nicole_5521
#1 Posted : Monday, July 12, 2021 4:07:18 PM
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Hi,

For Q7, I'm wondering if the real MCAT would ever have answer options that are this close together (6.8 vs. 7)? If so, how would you get to the correct choice while rounding the math? The way the answer key did it was rounding up to 35, but wouldn't you have to correct for the rounding, therefore, concluding that your answer is less than 7?

For Q38, what is a coordinate bond? How come this isn't ionic because don't we have a metal and a nonmetal? Also, coordinate bond doesn't seem to show up in any of the content, is it typical for the MCAT to test extra concepts like this?

Thanks!
INSTR_Katrina_128
#2 Posted : Monday, July 12, 2021 5:02:20 PM
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Q7: Yeah this one's a sneaker!

The rounding is justified here for very close answers because you round UP on the percentage and DOWN on the molar mass, and you're rounding by approximately the same magnitude, so the rounding "cancels itself out". Therefore, A is the correct answer.

Otherwise, I agree that rounding UP would require a correct later. But since we did both during the calculation, they do cancel out and no correction is needed later on.

If you check it with a calculator (just did), you'll see that 7.04 g is the actual answer.

Q38: It's a pretty specialized concept, which is why we didn't talk about it.

A coordinate bond is a covalent bond (sharing bond) where all of the electrons are supplied by only ONE of the atoms involved.

You'll come across this term in pretty COMPLEX molecules, such as... coordination complexes, which we see in this question.

So if you run across another COMPLEX molecule, chances are it's got coordinate bonds.


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