MCAT EXAM STUDY GUIDE
2026-2027 Exam Questions
with 100% Correct Answers |
Latest Update
What is the aufbau principle? - ANSWER ✔✔Electrons fill orbitals
starting from the lowest energy level to the highest energy level
What is Hund's rule? - ANSWER ✔✔Electrons fill degenerate orbitals
singly before pairing up, and all unpaired electrons have parallel spins
What is the Pauli exclusion principle? - ANSWER ✔✔No two
electrons in an atom can have the same four quantum numbers
,What are the four quantum numbers? - ANSWER ✔✔Principal (n),
angular momentum (l), magnetic (ml), and spin (ms)
What does the principal quantum number (n) represent? - ANSWER
✔✔Energy level and size of the orbital; n = 1, 2, 3, etc.
What does the angular momentum quantum number (l) represent? -
ANSWER ✔✔Shape of the orbital; l = 0 to (n-1); s=0, p=1, d=2, f=3
What is electronegativity? - ANSWER ✔✔The ability of an atom to
attract electrons in a chemical bond
Which element has the highest electronegativity? - ANSWER
✔✔Fluorine (F)
How does electronegativity trend across a period? - ANSWER
✔✔Increases from left to right
How does electronegativity trend down a group? - ANSWER
✔✔Decreases down a group
What is ionization energy? - ANSWER ✔✔The energy required to
remove an electron from a gaseous atom
How does ionization energy trend across a period? - ANSWER
✔✔Increases from left to right
,How does ionization energy trend down a group? - ANSWER
✔✔Decreases down a group
What is electron affinity? - ANSWER ✔✔The energy change when an
electron is added to a gaseous atom
What is atomic radius? - ANSWER ✔✔The distance from the nucleus
to the outermost electron shell
How does atomic radius trend across a period? - ANSWER
✔✔Decreases from left to right
How does atomic radius trend down a group? - ANSWER
✔✔Increases down a group
What is the formula for molarity (M)? - ANSWER ✔✔M = moles of
solute / liters of solution
What is the formula for molality (m)? - ANSWER ✔✔m = moles of
solute / kilograms of solvent
What is the formula for mole fraction? - ANSWER ✔✔Mole fraction =
moles of component / total moles
What is Avogadro's number? - ANSWER ✔✔6.022 × 10²³ particles
per mole
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2026. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, What is the ideal gas law? - ANSWER ✔✔PV = nRT
What is the value of R in the ideal gas law? - ANSWER ✔✔0.0821
L·atm/(mol·K) or 8.314 J/(mol·K)
What is Dalton's law of partial pressures? - ANSWER ✔✔The total
pressure of a gas mixture equals the sum of the partial pressures of
each gas
What is Graham's law of effusion? - ANSWER ✔✔Rate of effusion is
inversely proportional to the square root of molar mass
What is a Lewis acid? - ANSWER ✔✔An electron pair acceptor
What is a Lewis base? - ANSWER ✔✔An electron pair donor
What is a Brønsted-Lowry acid? - ANSWER ✔✔A proton (H⁺) donor
What is a Brønsted-Lowry base? - ANSWER ✔✔A proton (H⁺)
acceptor
What is the pH formula? - ANSWER ✔✔pH = -log[H⁺]
What is the pOH formula? - ANSWER ✔✔pOH = -log[OH⁻]
What is the relationship between pH and pOH? - ANSWER ✔✔pH +
pOH = 14 (at 25°C)
2026-2027 Exam Questions
with 100% Correct Answers |
Latest Update
What is the aufbau principle? - ANSWER ✔✔Electrons fill orbitals
starting from the lowest energy level to the highest energy level
What is Hund's rule? - ANSWER ✔✔Electrons fill degenerate orbitals
singly before pairing up, and all unpaired electrons have parallel spins
What is the Pauli exclusion principle? - ANSWER ✔✔No two
electrons in an atom can have the same four quantum numbers
,What are the four quantum numbers? - ANSWER ✔✔Principal (n),
angular momentum (l), magnetic (ml), and spin (ms)
What does the principal quantum number (n) represent? - ANSWER
✔✔Energy level and size of the orbital; n = 1, 2, 3, etc.
What does the angular momentum quantum number (l) represent? -
ANSWER ✔✔Shape of the orbital; l = 0 to (n-1); s=0, p=1, d=2, f=3
What is electronegativity? - ANSWER ✔✔The ability of an atom to
attract electrons in a chemical bond
Which element has the highest electronegativity? - ANSWER
✔✔Fluorine (F)
How does electronegativity trend across a period? - ANSWER
✔✔Increases from left to right
How does electronegativity trend down a group? - ANSWER
✔✔Decreases down a group
What is ionization energy? - ANSWER ✔✔The energy required to
remove an electron from a gaseous atom
How does ionization energy trend across a period? - ANSWER
✔✔Increases from left to right
,How does ionization energy trend down a group? - ANSWER
✔✔Decreases down a group
What is electron affinity? - ANSWER ✔✔The energy change when an
electron is added to a gaseous atom
What is atomic radius? - ANSWER ✔✔The distance from the nucleus
to the outermost electron shell
How does atomic radius trend across a period? - ANSWER
✔✔Decreases from left to right
How does atomic radius trend down a group? - ANSWER
✔✔Increases down a group
What is the formula for molarity (M)? - ANSWER ✔✔M = moles of
solute / liters of solution
What is the formula for molality (m)? - ANSWER ✔✔m = moles of
solute / kilograms of solvent
What is the formula for mole fraction? - ANSWER ✔✔Mole fraction =
moles of component / total moles
What is Avogadro's number? - ANSWER ✔✔6.022 × 10²³ particles
per mole
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2026. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, What is the ideal gas law? - ANSWER ✔✔PV = nRT
What is the value of R in the ideal gas law? - ANSWER ✔✔0.0821
L·atm/(mol·K) or 8.314 J/(mol·K)
What is Dalton's law of partial pressures? - ANSWER ✔✔The total
pressure of a gas mixture equals the sum of the partial pressures of
each gas
What is Graham's law of effusion? - ANSWER ✔✔Rate of effusion is
inversely proportional to the square root of molar mass
What is a Lewis acid? - ANSWER ✔✔An electron pair acceptor
What is a Lewis base? - ANSWER ✔✔An electron pair donor
What is a Brønsted-Lowry acid? - ANSWER ✔✔A proton (H⁺) donor
What is a Brønsted-Lowry base? - ANSWER ✔✔A proton (H⁺)
acceptor
What is the pH formula? - ANSWER ✔✔pH = -log[H⁺]
What is the pOH formula? - ANSWER ✔✔pOH = -log[OH⁻]
What is the relationship between pH and pOH? - ANSWER ✔✔pH +
pOH = 14 (at 25°C)
