Question

11. (10 pts) An electron beam, for cancer therapy, was configured by accelerating the electrons to 1.00 x 105 ev kinetic energy. What is the de Broglie wavelength of these electrons, in meters, to three sig. figs.? 12. W/m (a) (20 pts) Thiosulfate, S203-, is just like sulfate, except that one oxygen atom in sulfate has been substituted by sulfur. Draw one correct Lewis structure for thiosulfate, showing all lone pairs and all formal charges, if different than zero. (b) (10 pts) Keeping in mind our stated ideas about how to optimize Lewis structures for atoms like P, S, As etc. that do not have to follow the octet rule, how many total resonance structures are there for thiosulfate? n = Lucky 13. Refer to the following molecular formulas by their letter designations A-H when answering. If none of the letters designating a structure match the criteria, write "none". Each answer could be one or more letters (or "none"). "Orbital geometry" refers to central atom in AX, type. NaCl KF SF6 XeF4 SO2 Soz BF3 NO А B с D E F G H (a) (5 pts) Which one(s) have a high melting point? (b) (5 pts) Which one(s) have octahedral orbital geometry? (d) (5 pts) Which one(s) have no dipole moment? (e) (5 pts) Which one(s) are a free radical? 160 Have the rest of a good summer!

Answer 1

Solution: 11: Given Data Kinetic en energy J امر 2100xios en = 1:00x105cv X1.602x10194 18V we know, that 1.602 X10-19 E = he where h = plank's constant E = speed of light 1 = he &= wave E we lengtes j= 6.6x10 IS X:3.0 x108 mis 10602 X10-147 1=1-2359 x10 "m - 1.24*10-11 Hon = 1.24x10-11 -34 m