CH301 Worksheet 5: Practice Exam It is recommended that you use this worksheet as practice for the exam, not for studying. Try to complete the worksheet without using any reference material and within 90minutes. 1. What would you expect to happen if you hit a molecule with a gamma ray? 1. It would start to vibrate. 2. It would start to rotate. 3. An electron would be promoted to a higher energy level. 4. It would break apart into constituent atoms. 2. The photoelectric effect gave evidence against classical mechanics for which reason? 1. The energy with which electrons were ejected depended sensitively on the intensity of the light used. 2. There was a threshold intensity below which no electrons were emitted. 3. There was a threshold frequency below which no electrons were emitted. 4. Classical mechanics predicted that no electrons should be emitted from the metal, no matter what kind of light it was hit with. 3. What is the wavelength of light emitted in the n = 5 to n = 3 transition for hydrogen? 1280 nm 4. Which of the following is not a valid wavelength for a particle in a box of length 10 nm? 1. 3.33 nm 2. 5 nm 3. 10 nm 4. 15 nm 5. 20 nm5. You know the velocity of a proton (m = 1.67 x 10-27 kg) with an uncertainty of 1.00 km/s. What is the minimum uncertainty in the position of the proton? 31.6 pm 6. The peak emission wavelength from a blackbody radiator is 550 nm. What is the temperature of the radiator? 5240 K 7. What is the physical meaning of the wave function found by solving the Schrödinger equation? 1. It gives the probability of finding the particle at each location in space. 2. Its square root gives the probability of finding the particle at each location in space. 3. Its square gives the probability of finding the particle at each location in space. 8. Which group is known as the halogens? 1. 1 2. 2 3. II 4. VII 5. 18 9. For n = 3, l = 2, which of these is not an allowed value of ml? 1. -2 2. 0 3. 3 4. 210. Which of the following is a valid quantum number assignment? 1. n = 1, l = 1, ml = 0, ms = 0 2. n = 3, l = 2, ml = 2, ms = ½ 3. n = 5, l = 0, ml = 1, ms = -½ 4. n = 2, l = 2, ml = 1, ms = ½ 5. n = 3. l = 2, ml = -1, ms = -1 11. Coulombic electron-electron repulsion is the reasoning behind which of the following rules? 1. the Aufbau Principle 2. Hund’s Rule 3. the octet rule 4. the Pauli Exclusion Principle 12. Which of the following is the correct electronic configuration for V? 1. [Ar]3d34s2 2. [Ar]4s24p2 3. [Ar]3d5 4. [Ar]3d34p2 13. Which of the following is the correct electronic configuration for Sb+? 1. [Kr]3d104s14p3 2. [Kr]3d104s24p2 3. [Kr]4s24p24d10 4. [Kr]3d84p6 5. [Kr]3d94s24p314. Which of the following is an INCORRECT valence shell electron configuration? 1. s2p2 2. s2d4 3. s2d8 4. s1d10 5. s2p5 15. Stable filled and half-filled shells and subshells explain which of the following? 1. The atomic radius of sulfur is smaller than that of phosphorous. 2. The electronegativity of fluorine is higher than that of oxygen. 3. The electron affinity of carbon is higher than that of nitrogen. 4. Tin has more metallic character than arsenic. 16. Create an isoelectronic series and rank the following in order of increasing ionic radius: As, Sr, Y, Br, Rb 1. As+3 < Br+ < Rb- < Sr-2 < Y-3 2. Y+3 < Sr+2 < Rb+ < Br- < As-3 3. Rb+ < Br- < Sr+2 < Y+3 < As-3 4. As-3 < Br- < Rb+ < Sr+2 < Y+3 5. Y-3 < Sr-2 < Rb- < Br+ < As+3 17. Rank the following in order of increasing ionization energy: Ba, Ge, As, Fe, Mn, Se 1. Ba < Fe < Mn < Ge < Se < As 2. Ba < Mn < Fe < Ge < As < Se 3. As < Se < Ge < Mn < Fe < Ba4. Ba < Mn < Fe < As < Ge < Se 5. Se < As < Ge < Fe < Mn < Ba 18. Which of the following is the correct Lewis structure for the ionic compound containing Ga and S? 1. GaS, 2. GaS,22 3. GaS,232 3 4. GaS,23 19. Rank the following in order of increasing crystal lattice energy: LiF, Al2O3, LiCl, Na2O 1. Al2O3 < Na2O < LiF < LiCl 2. Na2O < Al2O3 < LiCl < LiF 3. LiCl < LiF < Na2O < Al2O3 4. LiF < LiCl < Na2O < Al2O3 20. Which of the following compounds has resonance? 1. CO2 2. CCl4 3. AsS3- 4. I-3 5. PCl521. Which of the following is the correct structure for CH4O? 1. COHHHH 2. O CHHHH 3. OCHHHH 4. OCHHHH 22. Which of the following can not fulfill the octet/duplet rule for all atoms in the molecule? 1. CO2 2. H2O 3. NO2- 4. PS 23. The octet rule is violated for the aluminum atom in AlH3. Why? 1. There are too many valence electrons. 2. There are an odd number of valence electrons. 3. There are too few valence electrons. 4. Adding more electrons to the aluminum atom would change its formal charge from 0 to -1.24. Which of the following molecules contains a triple bond? 1. SeCP- 2. HSiP 3. GeS2 4. CH2O 25. Which of the following is the correct Lewis dot structure for ClF2-? 1. ClF F 2. ClF F 3. ClF F 26. In which of the following molecules does the central atom have more than 8 electrons? 1. CCl4 2. SeBr4 3. BF3 4. SiS2 27. What is the formal charge on carbon in CO? 1. -2 2. -1 3. 0 4. 1 5. 228. Based on formal charge, which is the central atom in a molecule made up of one Ge, one As, and one I? 1. Ge 2. As 3. I 29. Which of the following has the longest Si-C bond length? 1. Si CHHH HHH 2. Si CHH HH 3. Si CH H 30. What is the EN difference in BeO? 1. 0.5 2. 1.0 3. 1.5 4. 2.0 5.
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