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Tutor profile: Dominic A.

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Dominic A.
Graduate Student tutoring in Science/Pre-Med subjects
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Questions

Subject: Organic Chemistry

TutorMe
Question:

What is pKa? How does this relate to mechanisms/reactions?

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Dominic A.
Answer:

pKa can be thought of as a molecule's binding affinity for hydrogen atoms. The lower the pKa, the stronger the acid. Strong acids have a "low" hydrogen binding affinity, and more readily "give up" their hydrogen atoms to molecules that are less acidic (higher pKa). This is why a strong acid such as HCL (pKa: -8) can donate its hydrogen atom to water (pKa: 15) to form H3O+ (pKa: -1.7). HCL + H2O --> H3O+ pKa: -8 15 -1.7

Subject: Biomedical Science

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Question:

Neurobiology - When an action potential initally occurs, the neuron becomes ____ . When measured, this is shown by the voltage becoming closer to zero.

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Dominic A.
Answer:

A: Depolarized. The voltage "rising" to zero coincides with a decrease in polarity. Polarity occurs when an area is partially negative or positive - often due to differences in ion concentrations.

Subject: Basic Chemistry

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Question:

In chemistry, what do elements in the same 'group' have in common with one another?

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Dominic A.
Answer:

These elements have the same number of valence electrons. These electrons determine the extent that bonds may be formed.

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