AAMC MCAT Chemical and Physical Foundations

Question 1

What does a negative ΔG value indicate about a chemical reaction?

Accepted Answer

The reaction is spontaneous and releases free energy

Answer

The reaction requires energy input to proceed

Answer

The reaction is at equilibrium

Answer

The reaction is endothermic

Question 2

According to Boyle's Law, if volume is halved at constant temperature, what happens to pressure?

Accepted Answer

Pressure doubles

Answer

Pressure halves

Answer

Pressure stays the same

Answer

Pressure quadruples

Question 3

What is the significance of pH = pKa in a buffer solution?

Accepted Answer

The acid and conjugate base are in equal concentrations

Answer

The solution is maximally acidic

Answer

The buffer capacity is zero

Answer

All acid has been deprotonated

Question 4

Which quantum number describes the shape of an atomic orbital?

Accepted Answer

Azimuthal quantum number (l)

Answer

Principal quantum number (n)

Answer

Magnetic quantum number (ml)

Answer

Spin quantum number (ms)

Question 5

What does a high Reynolds number indicate about fluid flow?

Accepted Answer

Turbulent flow where inertial forces dominate

Answer

Laminar flow with smooth streamlines

Answer

Viscous-dominated creeping flow

Answer

Incompressible inviscid flow

Question 6

What is the stereochemical outcome of an SN2 reaction?

Accepted Answer

Inversion of configuration (Walden inversion)

Answer

Retention of configuration

Answer

Complete racemization

Answer

Formation of a planar carbocation intermediate