Practice Exam 2

3 10. Which of the following frequencies corresponds to light with the longest wavelength? a. 9.12 × 10 12 s –1 b. 3.20 × 10 9 s –1 c. 8.50 × 10 20 s –1 d. 3.00 × 10 13 s –1 e. 4.12 × 10 5 s –1 11. Select the correct molecular geometry for NH 3 . a. linear b. tetrahedral c. trigonal pyramidal d. bent e. None of these 12. Light has a wavelength of 560 nm. What is the energy of a photon of this light? a. 2.53× 10 18 J b. 3.95 × 10 –20 J c. 1.24 × 10 –18 J d. 1.18 × 10 –19 J e. 3.55 × 10 –19 J 13. Consider an atom traveling at 1% of the speed of light. The de Broglie wavelength is found to be 1.48 × 10 -2 pm. Which element is this? a. Pb b. O c. Mg d. Cr e. Be 14. Select the correct molecular geometry for XeOF 4 . a. square pyramidal b. trigonal bipyramidal c. octahedral d. tetrahedral e. none of these 15. Which of the following molecules does not have a dipole moment? a. H 2 O b. H 2 S c. H 2 Xe d. All of these have a dipole moment. e. None of these has a dipole moment.