Chemistry - Physical Chemistry
MCQS
A. mol/L
B. g/L
C. L/mol
D. mol/g
The unit of molarity (M) is mol/L.
A. PV = nRT
B. P = V/nRT
C. PV = nT/R
D. PV = RT/n
The ideal gas law equation is PV = nRT.
A. Pascal (Pa)
B. Atmosphere (atm)
C. Torr
D. Bar
The SI unit of pressure is the Pascal (Pa).
A. Condensation
B. Evaporation
C. Sublimation
D. Fusion
The process of a gas turning into a liquid is known as condensation.
A. Acidity or alkalinity
B. Concentration of ions
C. Temperature
D. Pressure
pH measures the acidity or alkalinity of a solution.
A. q = mcΔT
B. q = nCΔT
C. q = ΔH
D. q = ΔS
The formula for calculating heat (q) in a reaction is q = mcΔT.
A. Conservation of energy
B. Conservation of mass
C. Conservation of momentum
D. Conservation of charge
The first law of thermodynamics is also known as the law of conservation of energy.
A. ΔG = ΔH - TΔS
B. ΔG = ΔH + TΔS
C. ΔG = ΔH/T
D. ΔG = -ΔH/T
The equation for the Gibbs free energy (G) in a reaction is ΔG = ΔH - TΔS.
A. Volume
B. Temperature
C. Moles
D. Concentration
Boyle's law describes the relationship between pressure and volume.
A. w = -PΔV
B. w = PΔV
C. w = ΔH
D. w = ΔS
The equation for calculating work (w) in a gas expansion or compression is w = -PΔV.
A. Dalton's law of partial pressures
B. Boyle's law
C. Charles's law
D. Avogadro's law
Dalton's law of partial pressures states that the total pressure is the sum of partial pressures.
A. Joule (J)
B. Calorie (cal)
C. Electronvolt (eV)
D. Watt (W)
The SI unit of energy is the Joule (J).
A. u = √(3RT/M)
B. u = √(RT/M)
C. u = √(2RT/M)
D. u = √(4RT/M)
The formula for calculating the root mean square speed (u) is u = √(3RT/M).
A. Gibbs free energy
B. Enthalpy
C. Entropy
D. Internal energy
ΔG = ΔH - TΔS is related to Gibbs free energy.
A. k = A * e^(-Ea/RT)
B. k = A * e^(Ea/RT)
C. k = A * e^(-RT/Ea)
D. k = A * e^(RT/Ea)
The Arrhenius equation is expressed as k = A * e^(-Ea/RT).
A. Sublimation
B. Fusion
C. Evaporation
D. Condensation
The process of a solid turning directly into vapor is known as sublimation.
A. Boyle's law
B. Charles's law
C. Avogadro's law
D. Gay-Lussac's law
Boyle's law states the inverse relationship between volume and pressure at constant temperature.
A. ΔU = q + w
B. ΔU = q - w
C. ΔU = q * w
D. ΔU = q / w
The equation for calculating the change in internal energy (ΔU) is ΔU = q - w.
A. Second law of thermodynamics
B. Zeroth law of thermodynamics
C. First law of thermodynamics
D. Third law of thermodynamics
The second law of thermodynamics states that the total entropy of an isolated system can never decrease.
A. Joule per Kelvin (J/K)
B. Calorie per Kelvin (cal/K)
C. Watt per Kelvin (W/K)
D. Coulomb per Kelvin (C/K)
The unit of heat capacity is Joule per Kelvin (J/K).
A. R = 8.314 J/(mol·K)
B. R = 1.987 cal/(mol·K)
C. R = 0.0821 L·atm/(mol·K)
D. All of the above
The ideal gas constant (R) can be expressed as 8.314 J/(mol·K), 1.987 cal/(mol·K), or 0.0821 L·atm/(mol·K).
A. B = F + 100
B. B = F + 32
C. B = F - 32
D. B = F - 100
The relationship between the freezing point (F) and boiling point (B) in the Celsius scale is B = F + 100.
A. Charles's law
B. Boyle's law
C. Avogadro's law
D. Gay-Lussac's law
Charles's law states the direct relationship between volume and temperature at constant pressure.
A. Conduction
B. Convection
C. Radiation
D. Advection
The process of heat transfer through direct contact is called conduction.
A. c = λν
B. c = ν/λ
C. c = λ + ν
D. c = λ - ν
The formula for calculating the speed of light (c) is c = λν, where λ is wavelength and ν is frequency.
A. Boiling point
B. Melting point
C. Triple point
D. Critical point
The point at which a system undergoes a phase transition between liquid and gas is called the boiling point.
A. ΔHrxn = Σ (bond energies broken) - Σ (bond energies formed)
B. ΔHrxn = Σ (bond energies formed) - Σ (bond energies broken)
C. ΔHrxn = Σ (bond energies broken) * Σ (bond energies formed)
D. ΔHrxn = Σ (bond energies broken) / Σ (bond energies formed)
The equation for calculating the heat of reaction (ΔHrxn) using bond energies is ΔHrxn = Σ (bond energies broken) - Σ (bond energies formed).
A. k ∝ e^(Ea/RT)
B. k ∝ e^(-Ea/RT)
C. k ∝ e^(RT/Ea)
D. k ∝ e^(-RT/Ea)
The relationship between the rate constant (k) and temperature (T) in the Arrhenius equation is k ∝ e^(-Ea/RT).
A. Pauli exclusion principle
B. Hund's rule
C. Heisenberg uncertainty principle
D. Bohr's model
The Pauli exclusion principle states that no two electrons in an atom can have the same set of quantum numbers.
A. Deposition
B. Condensation
C. Sublimation
D. Evaporation
The process of a gas changing directly to a solid is known as deposition.
A. Gay-Lussac's law
B. Boyle's law
C. Charles's law
D. Dalton's law
Gay-Lussac's law states the direct relationship between pressure and absolute temperature at constant volume.
A. Coulombs (C)
B. Amperes (A)
C. Volts (V)
D. Ohms (Ω)
The unit of electrical charge is measured in Coulombs (C).
A. Convection
B. Conduction
C. Radiation
D. Advection
The process of heat transfer through the movement of fluid particles is called convection.
A. Dalton's law of partial pressures
B. Boyle's law
C. Charles's law
D. Avogadro's law
Dalton's law of partial pressures states that the total pressure is the sum of partial pressures.
A. Hertz (Hz)
B. Joule (J)
C. Watt (W)
D. Ohm (Ω)
The SI unit of frequency is Hertz (Hz).
A. Q = Kc
B. Q > Kc
C. Q < Kc
D. Q = 1
The relationship between the equilibrium constant (Kc) and the reaction quotient (Q) is Q = Kc at equilibrium.
A. Rate = k[A]
B. Rate = k/[A]
C. Rate = k[A]^2
D. Rate = k√[A]
The equation for the rate of a chemical reaction in terms of reactant concentrations is Rate = k[A].
A. Sublimation
B. Deposition
C. Evaporation
D. Condensation
The process of a gas changing directly from a solid to a gas is known as sublimation.
A. Pauli exclusion principle
B. Heisenberg uncertainty principle
C. Hund's rule
D. Schrödinger equation
The Pauli exclusion principle states no two electrons can have the same set of four quantum numbers.
A. i = 1 + n - 1
B. i = n - 1
C. i = n + 1
D. i = 1/n
The Van't Hoff factor (i) is calculated using the formula i = 1 + n - 1, where n is the number of particles produced by solute dissociation.
A. Condensation
B. Evaporation
C. Sublimation
D. Deposition
The process of a gas changing directly from a gas to a liquid is known as condensation.
A. PV = nRT
B. PV = RT/n
C. P = nRT
D. P = RT/n
The ideal gas law equation in terms of the number of moles (n) is PV = nRT.
A. Radiation
B. Conduction
C. Convection
D. Advection
The process of heat transfer through electromagnetic waves is called radiation.
A. ΔxΔp ≥ ħ/2
B. ΔxΔp ≤ ħ/2
C. ΔxΔp = ħ
D. ΔxΔp > ħ/2
Heisenberg's uncertainty principle is mathematically represented as ΔxΔp ≥ ħ/2, where Δx is the uncertainty in position, Δp is the uncertainty in momentum, and ħ is the reduced Planck's constant.
A. Joule (J)
B. Calorie (cal)
C. Electronvolt (eV)
D. Watt (W)
The SI unit of heat is the Joule (J).
A. Conduction
B. Convection
C. Radiation
D. Advection
The process of heat transfer through the movement of charged particles is called conduction.
A. ΔG = ΔH - TΔS
B. ΔG = ΔH + TΔS
C. ΔG = ΔH/T
D. ΔG = -ΔH/T
The equation for calculating the change in Gibbs free energy (ΔG) is ΔG = ΔH - TΔS.
A. Bohr's model
B. Schrödinger equation
C. Pauli exclusion principle
D. Hund's rule
Bohr's model explains the quantized energy levels of electrons in an atom.
A. V/T = constant
B. PV = constant
C. P/T = constant
D. V = constant/T
Charles's law is represented by the equation V/T = constant.
A. Advection
B. Conduction
C. Convection
D. Radiation
The process of heat transfer through the bulk movement of fluid particles is known as advection.
A. The energy required to remove an electron from an atom
B. The energy released when an electron is added to an atom
C. The energy required to change the state of matter
D. The energy associated with electron spin
Ionization energy refers to the energy required to remove an electron from an atom.
A. PV = constant
B. P/T = constant
C. V/T = constant
D. PV = nRT
Boyle's law is represented by the equation PV = constant.
A. q = mL
B. q = mcΔT
C. q = msΔT
D. q = nCΔT
The equation for calculating the heat transferred during a phase transition with no change in temperature is q = mL, where L is the latent heat.
A. Vaporization
B. Condensation
C. Evaporation
D. Sublimation
The process of a gas changing directly from a liquid to a gas is known as vaporization.
A. The energy released in a reaction
B. The energy required to initiate a reaction
C. The energy associated with the reactants
D. The energy associated with the products
Activation energy represents the energy required to initiate a chemical reaction.
A. ΔH° = Σ (bond energies formed) - Σ (bond energies broken)
B. ΔH° = Σ (bond energies broken) - Σ (bond energies formed)
C. ΔH° = Σ (bond energies broken) * Σ (bond energies formed)
D. ΔH° = Σ (bond energies broken) / Σ (bond energies formed)
The equation for calculating the standard enthalpy change (ΔH°) in a reaction is ΔH° = Σ (bond energies formed) - Σ (bond energies broken).
A. Hund's rule
B. Pauli exclusion principle
C. Heisenberg uncertainty principle
D. Aufbau principle
Hund's rule states that electrons fill the lowest energy orbitals first before pairing up.
A. Freezing
B. Deposition
C. Condensation
D. Sublimation
The process of a gas changing directly from a liquid to a solid is known as freezing.
A. Measure of disorder or randomness
B. Total internal energy of a system
C. Ability to do work
D. Heat transfer at constant pressure
Entropy represents the measure of disorder or randomness in a system.
A. q = mcΔT
B. q = mL
C. q = msΔT
D. q = nCΔT
The equation for calculating the heat transferred during a phase transition with a change in temperature is q = mcΔT.
A. ΔG° = ΔH° - TΔS°
B. ΔG° = ΔH° + TΔS°
C. ΔG° = ΔH°/T
D. ΔG° = -ΔH°/T
The equation for calculating the standard Gibbs free energy change (ΔG°) is ΔG° = ΔH° - TΔS°.
A. w = -PΔV
B. w = PΔV
C. w = ΔH
D. w = ΔS
The equation for calculating work (w) during a gas expansion or compression is w = -PΔV.
A. Advection
B. Conduction
C. Convection
D. Radiation
The process of heat transfer through the movement of fluid particles carrying heat is known as advection.
A. The most stable state of a substance
B. The state of a substance at 0°C and 1 atm pressure
C. The state of a substance in its natural form
D. The state of a substance in a closed system
Standard state refers to the state of a substance at 0°C and 1 atm pressure in thermodynamics.