Gen Chem Equations to study for the ACS Exam 28 Questions with Verified Answers, Exams of Chemistry

Download Gen Chem Equations to study for the ACS Exam 28 Questions with Verified Answers and more Exams Chemistry in PDF only on Docsity! Gen Chem Equations to study for the ACS Exam 28 Questions with Verified Answers Rydberg Equation for Hydrogen - CORRECT ANSWER Speed of Light/Wavelength/Frequency Equation - CORRECT ANSWER Speed of Light (3 x 10^8) Energy of a Single Quantum - CORRECT ANSWER E = hv v = frequency (c/λ) h = Planck's Constant (6.26 x 10^-34) Photoelectric Effect Equation - CORRECT ANSWER hv = KE + W h = Planck's Constant (6.26 x 10^-34) W = binding energy of the electron Electrostatic Energy Equation - CORRECT ANSWER E = (Q1*Q2)/D Q = charge(s) D = distance between nuclei De Broglie Wavelength Equation - CORRECT ANSWER λ = h/mu h = Planck's Constant (6.26 x 10^-34) m = mass (kg) u = velocity (m/s) Heisenberg Uncertainty Principle - CORRECT ANSWER "It is impossible to know exactly both the velocity and the position of a particle at the same time" Δx * mΔu ≥ (h/4π) Δx = uncertainty in position (m) m = mass (kg) Δu = uncertainty in velocity (m/s) h = Planck's Constant (6.26 x 10^-34) Effective Nuclear Charge (Zeff) - CORRECT ANSWER Z* = Z - σ Z = atomic Number σ = shielding/screening constant **(To be honest with you, the equation above is kind of ridiculous. It's literally just the valence electron value) Dipole Moment (µ) Equation - CORRECT ANSWER µ = Q*r µ = Debye Unit (D) Q = charge r = distance between the charges 1 D = 3.336 x 10^30 C*m C = Coulomb (unit for charge) Percent Ionic Character Equation - CORRECT ANSWER PIC = µ (observed) / µ (calculated) * 100% Bond Order Equation - CORRECT ANSWER BO = (# bonding electrons - # antibonding electrons)/2 Combined Gas Law Equation - CORRECT ANSWER P1V1/n1T1=P2V2/n2T2 P = pressure V = volume n = moles T = temperature Ideal Gas Law Equation - CORRECT ANSWER PV=nRT q = enthalpy/heat (J) Δusys = energy in relation to the system (J) w = work done (J) = PΔV, usually given to you as 'w' P = pressure ΔV = change in volume Heat Equation - CORRECT ANSWER Q = msΔT Q = enthalpy/heat (J) m = mass (g) s = Specific Heat (usually given to you) Hess's Law - CORRECT ANSWER If the reaction is carried out through many steps, the enthalpies of each step can be added to find the total for the entire reaction. **Not an equation, but it's really important to know this. Standard Enthalpy of a Reaction Equation (ΔHrxn) - CORRECT ANSWER ΔHrxn = (products' sum of ΔHf) - (reactants' sum of ΔHf ΔHf = enthalpy of the formation of the product/reactant ΔHrxn = enthalpy of the reaction (rxn) in (J) Bond Enthalpy Equation - CORRECT ANSWER ΔH* = (Sum of the reactants' # of bonds broken multiplied with their corresponding bond energies) - (Sum of the products' # of bonds formed multiplied with their corresponding bond energies) ΔH* = Bond Enthalpy (J) Root Mean Square Speed Equation - CORRECT ANSWER u = sqrt[(3RT)/M u = RMS Speed R = Molar Gas Constant T = temperature in Kelvin (K) M = Molar Mass Celsius-Kelvin Conversion Equation - CORRECT ANSWER *C + 273.15 = K *C = degrees Celsius K = Kelvin