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Tutor profile: Ziyad R.

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Ziyad R.
The Tutor Doctor (MCAT 96th Percentile, 7 years tutoring experience)
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Questions

Subject: Chemistry

TutorMe
Question:

What is the Acid dissociation constant? (Ka)

Inactive
Ziyad R.
Answer:

The acid dissociation constant is an equilibrium constant that represents the rate at which an acid dissociates in a solvent. Hydrochloric Acid (HCl) has a very high acid dissociation constant, so if you place it in water, the H+ and Cl- ions will dissociate almost immediately.

Subject: Biology

TutorMe
Question:

What makes up the lipid bilayer? What can move through it?

Inactive
Ziyad R.
Answer:

The lipid bilayer is composed of amphipathic phospholipids that have a hydrophobic tail and a hydrophilic head. This allows for the passage of hydrophobic (water-fearing) molecules through the cellular lipid bilayer, while keeping hydrophilic (water-loving) molecules out.

Subject: Physics

TutorMe
Question:

What is the difference between a vector a scalar quantity?

Inactive
Ziyad R.
Answer:

A scalar quantity represents a discrete unit that can be measured, such as your height or your weight. A vector quantity is something that has both magnitude and direction, so if I were to push you, I would be exerting a force of a certain magnitude in your direction. That force exerted would have a vector quantity.

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