AAMC MCAT Chemical and Physical Foundations 2

Question 1

How does electronegativity difference affect bond polarity?

Accepted Answer

Greater difference creates a more polar bond

Answer

A large electronegativity difference between bonded atoms creates a polar covalent or ionic bond, with electron density shifted toward the more electronegative atom.

Question 2

What does Beer-Lambert Law express mathematically?

Accepted Answer

A = εlc (absorbance = molar absorptivity × path length × concentration)

Answer

Beer-Lambert Law (A = εlc) states that absorbance equals the product of molar absorptivity, path length, and concentration.

Question 3

Which intermolecular force explains water's unusually high boiling point?

Accepted Answer

Hydrogen bonding

Answer

Water forms extensive hydrogen bonds between electronegative oxygen and hydrogen atoms, dramatically raising the boiling point compared to similar-sized molecules.

Question 4

How does a catalyst affect activation energy and equilibrium?

Accepted Answer

Lowers activation energy without shifting equilibrium

Answer

A catalyst provides an alternative lower-energy pathway, speeding both forward and reverse reactions equally, leaving the equilibrium constant unchanged.

Question 5

What is Ohm's Law?

Accepted Answer

V = IR

Answer

Ohm's Law (V = IR) states the voltage across a resistor equals the product of current flowing through it and its resistance.

AAMC - Association of American Medical Colleges Practice Test

AAMC - Association of American Medical Colleges Practice Test

AAMC MCAT Chemical and Physical Foundations 2