MSU CEM 141 FINAL EXAM PREP
2026/2027 WITH ACTUAL CORRECT
QUESTIONS AND VERIFIED DETAILED
ANSWERS |CURRENTLY TESTING
QUESTIONS AND SOLUTIONS|ALREADY
GRADED A+|NEWEST |JUST
RELEASED!!|GUARANTEED PASS
What is percent yield?
(Actual yield ÷ theoretical yield) × 100%.
Balanced equation meaning
Atom count conserved on both sides; coefficients represent particle ratios.
Diagram description: molecular rearrangement
Reactant molecules break bonds; atoms rearrange; new product molecules form.
Relationship between λ
ν, and c,c = λν.
Energy of a photon equation
E = hν = hc/λ.
Wave properties of EM radiation evidence
Diffraction and interference patterns.
Particle properties evidence
Photoelectric effect: electrons emitted only if frequency above threshold.
1|Page
, Photoelectric threshold meaning
Minimum frequency needed to eject electrons, regardless of intensity.
Why does light produce line spectra?
Electrons transition between quantized energy levels → specific wavelengths emitted.
Absorption vs emission
Absorption = electron jumps up; emission = electron falls down emitting photon.
Role of photons vs electrons in photoelectric effect
Photons eject electrons from metal surface.
Evidence electrons have wave nature
Electron diffraction (Davisson-Germer experiment).
de Broglie wavelength formula
λ = h / (mv).
What an orbital represents
Region of space with high probability of finding electron.
s vs p orbital description
s = spherical; p = dumbbell-shaped with node at nucleus.
Write electron configurations for first 36 elements
(Know how: Aufbau, Hund, Pauli, core notation.)
Core vs valence electrons
Core = inner, not involved in bonding; valence = outermost.
Effective nuclear charge (Z_eff)
Z_eff = attraction felt by valence e⁻; increases across a period.
2|Page
2026/2027 WITH ACTUAL CORRECT
QUESTIONS AND VERIFIED DETAILED
ANSWERS |CURRENTLY TESTING
QUESTIONS AND SOLUTIONS|ALREADY
GRADED A+|NEWEST |JUST
RELEASED!!|GUARANTEED PASS
What is percent yield?
(Actual yield ÷ theoretical yield) × 100%.
Balanced equation meaning
Atom count conserved on both sides; coefficients represent particle ratios.
Diagram description: molecular rearrangement
Reactant molecules break bonds; atoms rearrange; new product molecules form.
Relationship between λ
ν, and c,c = λν.
Energy of a photon equation
E = hν = hc/λ.
Wave properties of EM radiation evidence
Diffraction and interference patterns.
Particle properties evidence
Photoelectric effect: electrons emitted only if frequency above threshold.
1|Page
, Photoelectric threshold meaning
Minimum frequency needed to eject electrons, regardless of intensity.
Why does light produce line spectra?
Electrons transition between quantized energy levels → specific wavelengths emitted.
Absorption vs emission
Absorption = electron jumps up; emission = electron falls down emitting photon.
Role of photons vs electrons in photoelectric effect
Photons eject electrons from metal surface.
Evidence electrons have wave nature
Electron diffraction (Davisson-Germer experiment).
de Broglie wavelength formula
λ = h / (mv).
What an orbital represents
Region of space with high probability of finding electron.
s vs p orbital description
s = spherical; p = dumbbell-shaped with node at nucleus.
Write electron configurations for first 36 elements
(Know how: Aufbau, Hund, Pauli, core notation.)
Core vs valence electrons
Core = inner, not involved in bonding; valence = outermost.
Effective nuclear charge (Z_eff)
Z_eff = attraction felt by valence e⁻; increases across a period.
2|Page
