Chem 121 Exam 2 Actual Test Paper Questions Correct Answers Graded A Plus

CHEM 121 EXAM 2 ACTUAL TEST PAPER QUESTIONS CORRECT ANSWERS GRADED A
PLUS
CHEM 121 EXAM 2 Questions and Answers Verified
Solutions Latest Update 2026/2027

Question:
Strong Electrolytes (Definition)

Answer:
Strong acids, strong bases, and soluble ionic salts (100% dissociation)



Question:
Weak Electrolytes (Definition)

Answer:
Weak acids and weak bases (partial dissociation)



Question:
Oxidation vs. Reduction (OIL RIG)

Answer:
Oxidation is Loss of e-; Reduction is Gain of e-



Question:
Oxidation State of an Element (e.g.

Answer:
Na, H2), Always zero



Question:
Change in Internal Energy formula (∆E)

Answer:

,∆E = q + w



Question:
∆E Sign Convention: +q and +w

Answer:
+q = system gains heat; +w = work done ON system



Question:
Exothermic vs. Endothermic (∆H signs)

Answer:
Exothermic is -∆H (releases); Endothermic is +∆H (absorbs)



Question:
State Function (Definition)

Answer:
Property depends only on current state, not path (e.g., E, H, P, V, T)



Question:
Speed of Light Equation

Answer:
c = λν (Speed = Wavelength x Frequency)



Question:
Photon Energy Equation (Planck's)

Answer:
E = hν or E = hc / λ

, Question:
Principal Quantum Number (n)

Answer:
Defines size and energy level (n = 1, 2, 3.)



Question:
Angular Momentum Number (l)

Answer:
Defines orbital shape (s=0, p=1, d=2, f=3)



Question:
Magnetic Quantum Number (ml)

Answer:
Defines 3D orientation (ranges from -l to +l)



Question:
Spin Quantum Number (ms)

Answer:
Defines electron spin (+1/2 or -1/2)



Question:
Pauli Exclusion Principle

Answer:
No two electrons in an atom can have the same 4 quantum numbers