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

Greater difference creates a nonpolar bond

Answer

Electronegativity determines bond length only

Answer

Electronegativity has no effect on bond type

Question 2

What does Beer-Lambert Law express mathematically?

Accepted Answer

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

Answer

A = hf (absorbance proportional to frequency)

Answer

T = 1 − A (transmittance equals 1 minus absorbance)

Answer

A = kT (absorbance proportional to temperature)

Question 3

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

Accepted Answer

Hydrogen bonding

Answer

London dispersion forces

Answer

Dipole-dipole interactions

Answer

Ion-dipole interactions

Question 4

How does a catalyst affect activation energy and equilibrium?

Accepted Answer

Lowers activation energy without shifting equilibrium

Answer

Lowers activation energy and shifts equilibrium toward products

Answer

Raises activation energy for the reverse reaction

Answer

Shifts equilibrium without affecting activation energy

Question 5

What is Ohm's Law?

Accepted Answer

V = IR

Answer

P = IV

Answer

V = P/I

Answer

R = V + I

Question 6

Which law states total gas pressure equals the sum of component partial pressures?

Accepted Answer

Dalton's Law of Partial Pressures

Answer

Henry's Law

Answer

Graham's Law

Answer

Raoult's Law