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Tutor profile: Ryan H.

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Ryan H.
Medical student tutoring STEM!
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Questions

Subject: MCAT

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Question:

3. Which research project best represents a macrosociological approach to studying social support networks? A) A researcher follows the conversation of participants who post messages in an online support forum. B) A researcher interviews patients who participate in a local hospital’s support group for rare disorders. C) A researcher surveys patients for reasons that they joined an online support group for their disorder. D) A researcher tracks how the number of websites dedicated to rare disorders has changed over time.

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Ryan H.
Answer:

The correct answer here is D. This is the correct choice here because tracking changes via websites provides data on availability (growth or decline) of information about rare disorders. This type of project is aligned with a macrosociological approach because it would allow a researcher to determine how the organization of health information in a society changes over time (and through a wide lens). The other options are incorrect because they are more similar to a microsociological approach, as each would result in data that is based on small-scale interactions or individual decisions, rather than large scale changes monitored via website.

Subject: Chemistry

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Question:

Find the pH of a solution that is 5.06% HI by mass. Assume a density of 1.01 g/mL for the solution.

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Ryan H.
Answer:

Start by assuming there is one liter of the solution, which we can use alongside the density to find the mass of solution: Mass of solution = volume x density = 1L x (1.01g/mL) x (1,000mL/L) = 1,010g of solution We can then find the mass of HI within the solution by using the given percentage: 1,010g solution x 5.06% HI by mass = 1,010g x (0.0506) = 51.106g HI Once we know the mass, we can use this to find the number of moles of HI in solution. The molar mass of HI is 127.91g (found by adding the masses of H and I on the periodic table): 51.106g HI x (1 mol HI / 127.91g) = 0.3995 mol HI Since we assumed the initial volume of solution is 1L, we can use the concentration equation: Concentration = moles/volume = 0.3995 mol HI / 1L of solution = [HI] = 0.3995 M Now, because HI is a strong acid, the concentration of hydronium (H3O+) ions in solution is equal to the molarity of HI, and therefore equal to 0.3995M. Lastly, we can use the pH formula to find our desired pH of HI: pH = -log(H3O+) = -log(0.3995M) = 0.398 We know that pH exists on a scale of 0 - 14, where 0 is very acidic and 14 is very basic. In this case, our solution is extremely acidic, as it is between 0 and 1. This, again, relates to HI existing as a strong acid.

Subject: Biology

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Question:

What is the major role of the sciatic nerve in lower limb function?

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Ryan H.
Answer:

The sciatic nerve is the major nerve of the lower extremity, emerging from the ventral horn of spinal cord levels L4-S3. It runs through the hip and down the posterior leg, supplying the three major hamstring muscles (semimembranosus, semitendenosus, and biceps femoris) before splitting into the tibial and common peroneal/fibular nerves. The tibial nerve continues down the posterior compartment of the leg, innervating the muscles of plantarflexion and inversion of the foot. The common fibular nerve splits into the superficial and deep branches, innervating the lateral and anterior compartments of the leg, respectively.

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