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Tutor profile: Joseph W.

Joseph W.
Subject Matter Expert - Chemistry (10 years experience)

Questions

Subject: Organic Chemistry

TutorMe
Question:

Consider a cyclohexane molecule with one methyl group attached on carbon 1. Would the axial or equatorial methyl group cause the molecule to be more stable?

Joseph W.
Answer:

Generally speaking, equatorial groups will cause the molecule to be more stable. This is because the groups in the equatorial position will point most furthest away from other groups and cause the least amount of interference. This interference or getting too close together causing an increase in instability. Putting groups equatorial will limit this interference and be the most stable configuration.

Subject: Chemistry

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Question:

Given an enthalpy value -100 kJ and an entropy value of -10 J/K. Determine if the reaction is spontaneous at low temperatures.

Joseph W.
Answer:

Using the idea of Gibbs free energy (Delta G), we can compare the signs of delta H (enthalpy) and delta S (entropy). Since Delta H is negative and Delta S is negative, we will need to assess the temperature. Delta G = Delta H - T * Delta S. With a small value for T, delta G will turn out negative. When Delta G is negative the reaction is spontaneous.

Subject: Basic Chemistry

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Question:

Determine how many valence electrons are within one oxygen atom.

Joseph W.
Answer:

To determine the valence electrons of the oxygen atom, we must assess the outer most shell where the electrons are stored. From the periodic table, we can see that oxygen is within group 6A. The 6 corresponds to the number of valence electrons totaling 6. We would report 6 as our answer.

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