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Unformatted text preview: Chemistry 20-A-1 Professor Scerri Mid-term 2 Nov, 2003 PROBLE M SCORE POINTS 1 20 2 17 3 12 4 18 total 67 Name _____________________ Signature __________________ ID #_______________________ Name ________________________________ 2 Instructions : This exam has 4 questions plus a periodic table at end of exam. Verify you have the right number of pages before you begin. Write your name on each page. Raise your hand if you dont understand a question. SHOW YOUR WORK ! No credit will be given for an unsubstantiated or illegible answer. Write legibly, use proper units throughout and use significant figures in all answers. For questions requiring explanations do not exceed the line limit shown by dotted lines. If you do it will not even be read by the grader! Possibly useful information : 12 inches = 1 foot, 2.54 cm = 1 inch. h = 6.63 x 10-34 J sec N o = 6.02 x 10 23 mol-1 c = 3.00 x 10 8 m sec-1 m e = 9.11 x 10-31 kg 1 a.m.u. = 1.66 x 10-27 kg 1 = 10-10 m g = 9.81 m/s 1 eV = 1.602 x 10-19 J V electrostatic (r) Q 1 Q 2 /r; K.E. =1/2mv 2 = p 2 /2m F = - V/ r = c E = E f- E i = photon = h h = h + K. E.(electron) mass = h mv = h p m v x = p x h 4 Probability density = | n (r)| 2 E n = -(2.18 x 10-18 J)Z eff 2 /n 2 ; r n = (0.529 )n 2 /Z eff n-l-1 spherical (radial) nodes; l angular nodes; n-1 total nodes...
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