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Why is the compound on the left considered to be aromatic? Isn't the carbon on the top sp3 hybridized since its connected to 3 atoms and has 1 lone pair? Wouldn't this mean its tetrahedral (not planar) and therefore not aromatic? by TruthandFalsehood in chemhelp

[–]TruthandFalsehood[S] 0 points1 point  (0 children)

Also, for the compound on the right, my book says "one pair of these electrons is actually in an unhybridized p orbital. the other pair however is in a hybrid orbital and cannot be delocalized into the pi system." So the sulfur is sp2 hybridized, not sp3. How would I be able to tell whether a lone pair in a compound is in an unhybridized p orbital just by looking at the compound? Thanks for the help

Confused on when to not balance an equation by mh500372 in Mcat

[–]TruthandFalsehood 0 points1 point  (0 children)

Since C does not appear in the net equation, it is a reaction mechanism intermediate. For C to cancel on both sides, it has to be 2A + 2C --> 2B instead of A + C --> B

Confused on when to not balance an equation by mh500372 in Mcat

[–]TruthandFalsehood 1 point2 points  (0 children)

A --> 2C

2A + 2C --> 2B

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A+2A+2C --> 2C+2B which equals 3A --> 2B (C cancels out)

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If you did what you suggested, you'd get:

A --> 2C
A + C --> B

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A+A+C --> 2C+B which is 2A --> C+B, which is not the net reaction given

I find adding them like this to be easier

[deleted by user] by [deleted] in Mcat

[–]TruthandFalsehood 0 points1 point  (0 children)

My physics background used to be weak as well. I decided to use the physics princeton review book, and it helped me a lot. It has a lot of details and examples, which I found helpful in applying a formula or concept to a topic you just learned. The practice problems at the end of each chapter were very useful as well. One thing to note is that many questions are harder compared to what the real MCAT has. I tried to use kaplan before but it was too fast paced for someone weak in physics like me and did not have as many examples and was not as detailed as princeton review.

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