# Chem 6 Sample Exam 2 Brief Answers

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1 1 hem 6 Sample Eam 2 Brief Answers 1a. Two possible approaches here to find the energy difference and hence the frequency. Either find the energy of both states and subtract, or use one of the formulas that includes the subtraction for you. E = hν The energy of the n = 253 and n = 252 states is given by E n = J(Z 2 /n 2 ) where Z = 1 for the hydrogen atom E 253 = J(1 2 /253 2 ) = J E 252 = J(1 2 /252 2 ) = J E = E final E initial = E 252 E 253 = J (a negative number, so energy is emitted) hν = E so ν = l El/h = J/ Js = s 1 or 410 Mz (radiofrequency) your final numerical result may be somewhat different, depending on how you rounded off the numbers above r, ν = s 1 Z 2 (1/n f 2 1/n i 2 ). Plug in Z = 1, n f = 252, n i = 253, to get ν = s 1 1b. The Bohr radius is given by r = a o n 2 /Z Å where a o = Å = m Plug in n = 253 and Z =1 to get r = m(253) 2 = m 1000mm/m = mm. That seems a bit small to see unless you've got really good vision. But still, mighty big for an atom! 2. E n = n 2 h 2 /8mL 2 Plug in n=1 and 2, plus all the constants E 1 = ( Js) 2 (1) 2 /8( kg)( m) 2 = J E 2 = same thing, but multiplied by 2 2 instead of 1 2, so it's J The energy difference is E= E 2 E 1 = J E = hν = hc/λ so λ = hc/e = ( Js)(310 8 m/s)/ J = m 10 9 nm/m = ~20 nm. You could also do this by using the formula for the energy difference between states of quantum numbers n and n1: E = (2n1)h 2 /8mL 2, plugging in n=1 to get the separation between E 1 and E 2.

2 2 3. Zero-point energy is defined as the minimum energy of the system. So for the atom it's the energy of the ground state, where n =1, given by E n = JZ 2 /n 2 Plug in n=1 and Z=1 for hydrogen to get J. or the particle in a bo, energy is E n = n 2 h 2 /8mL 2 The minimum is in the ground state at n = 1; plug in the mass of the electron and set the energy equal to the magnitude of the ZPE above: E 1 = 1 2 h 2 /8mL 2 = le atom l = J Set up to solve for L, then plug in the numbers as follows [n 2 h 2 /8mE atom ] 1/2 = L = [1 2 ( Js) 2 /8( kg)( J)] 1/2 = m Å/m = 1.66Å or nm 4a. These spherical shells are nodes, regions of space where the value of the wavefunction is zero; this means Ψ 2 is zero and the probability of finding the particle there is zero. (b) See the picture. or the 2s orbital there is one such node, with 2 for the 3s. ote that Ψ 2 becomes small, but not zero!, at large r.

3 3 (c) To find the r values, set Ψ equal to zero and solve for σ (since this is equal to Zr/a o, you will get r). or 2s, Ψ is zero at σ = 2; since Z = 1 for the atom, then r = 2a o = 1.06Å or 3s, Ψ is zero when the function 27 18σ 2σ 2 = 0 Solve this with the quadratic formula from the equation sheet. irst divide through by two to get 27/2 9σ σ 2 = 0 Then solve for σ: σ = [b±(b 2 4ac) 1/2 ]/2a = [9±(81-54) 1/2 ]/2 = 1.90 or 7.10 (2 nodes) convert this to r-values: σ = Zr /a o, but Z = 1 for the atom, so r = σa o. There are 2 solutions (nodes): r = 1.9a o = 1.9(0.529Å) = 1Å r = 7.1a 0 = 7.1(0.529Å) = 3.76Å 5.(a) As you go down the column, the valence electrons are farther from the nucleus (as n increases and the orbitals have greater radial etent), so they have reduced oulombic attraction to the nucleus and are easier to ionize. Likewise, an electron to be added would, for the same reason, have reduced (as you go down the column) oulombic attraction to the nucleus, so electron affinities are epected to be less eothermic (smaller in magnitude). (b) Going across a row, filling in the p-electrons, Z eff increases since these valence electrons don't shield each other efficiently. So the valence electrons are held more tightly/closely to the nucleus and atomic radius decreases across the row; thus e is smaller than B. (c) Br and Kr are isoelectronic, but Kr has larger Z, so there is greater oulombic attraction between nucleus and electrons, so the electrons are held tighter/closer to the nucleus, and hence the size of the Kr atom is smaller than that of Br.

4 4 6. ere are the resonance structures (a) Xe 4 is square planar. t's based on 6 electron pairs around the central Xe (octahedral electron pair geometry), with the lone pairs at 180 to minimize repulsions between them. o distortions epected. (b) Br 3 is T-shaped. t's based on 5 electron pairs around the central Br (trigonal bipyramidal electron pair geometry), with the lone pairs in the equatorial position to minimize repulsions. Because the lone pairs "take more room" than bonding pairs, epect that the aial Br atoms will bend away from the lone pairs so the eq -Br- a angle is less than 90. (c) 3 is bent. The -- angle is less than the epected (based on tetrahedral electron pair geometry at the central ) just as in water. Xe < 90 Br the -- angle is less than the ideal 109.5

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