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Tutor profile: Sadie D.

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Sadie D.
Chemistry and Math Tutor
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Questions

Subject: Organic Chemistry

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Question:

Which carbonyl functional group will undergo a nucleophilic attack first, an ester or a ketone?

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Sadie D.
Answer:

The ketone will react faster than the ester. The reason carboynls undergo nucleophilic attack is because of the partial positive charge on the carbonyl carbon. This partial positive makes the carbon a good electrophile, so a nucleophile will readily attack it. In an ester, the oxygen atom has lone pairs that it can donate into the carbonyl carbon through resonance. This resonance makes the ester more stable, and less likely to react. The ketone, on the other hand, does not have any resonance stabilization, so it will react faster.

Subject: Chemistry

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Question:

What element has the electron configuration: [Ar] 4s2 3d10 4p3?

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Sadie D.
Answer:

Arsenic (As). The previous noble gas is Argon, so we can abbreviate 1s2 2s2 2p6 3s2 3p6 as [Ar]. From there, Arsenic has a filled s orbital 4s2, a filled d orbital 3d10, and three electrons in a p orbital 4p3.

Subject: Algebra

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Question:

On February 1st, Alex can do five push-ups. Each day, she can do two more push-ups than the day before. How many push-ups will Alex be able to do on February 28th? Write the equation of a line representing the number of push-ups Alex can do over time.

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Sadie D.
Answer:

Alex will be able to do 59 pushups on February 28th. The equation of the line is y=2x+5 where y represents the number of pushups and x represents how many days have passed. On February 28th, x=27, therefore y=2(27)+5=59. The slope, 2, corresponds to how many more push-ups Alex can do each day. The y-intercept, 5, corresponds to how many push-ups Alex can do on February 1st, when x=0.

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