What is the energy of a photon with wavelength 232 nm?

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1 EMISTRY 110 EXAM 1 February 6, 2012 FRM A 1 ow many single covalent bonds must a sulfur atom form to have a complete octet in its valence shell? A. 3 B D. 2 E What are the correct numbers of protons, neutrons and electrons in a 37 l ion? p n e A B D E A small cm! cm! cm cube of lead weighs 41.7 mg. What is the density of lead expressed in g/cm 3? A. 1.65! 10 3 g/cm 3 B g/cm g/cm 3 D. 1.13! 10 4 g/cm 3 E. 6.05! 10 2 g/cm 3 4. What is the energy of a photon with wavelength 232 nm? A. 3.72! J B. 8.57! J. 5.34! J D. 3.51! J E. 8.57! J 5. What is the formal charge on chlorine in the perchlorate anion, l 4? A. 1 B D. +2 E Which is an allowed set of quantum numbers for an electron in a d-orbital? A. n = 3,! = 2, m! = 3, m s = +! B. n = 3,! = 1, m! = 1, m s = 1. n = 4,! = 3, m! = 2, m s =! D. n = 3,! = 1, m! = 0, m s = +! E. n = 4,! = 2, m! = 2, m s = +!

2 7. Atom X is in Group 2A and atom Y is in Group 7A. What formula would a compound formed between them have? A. XY B. X 2 Y. XY 2 D. XY 3 E. X 2 Y 6 8. Which of the following does not have a correct formula/name combination? Formula Name A. al 2 calcium chloride B. Ba 2 S 4 barium sulfate. FeS iron (II) sulfide D. Mg() 2 magnesium hydroxide E. NaN 3 sodium nitrate 9. Determine the electron configuration of 33 S. ow many shells and how many valence electrons does it have? A. # of shells = 3, # of valence e " = 5 B. # of shells = 4, # of valence e " = 6. # of shells = 3, # of valence e " = 6 D. # of shells = 2, # of valence e " = 6 E. # of shells = 4, # of valence e " = ow many unpaired electrons are in the ground state of Fe? A. 2 B D. 5 E Which of these ions is isoelectronic with Ne? i. F + ii. 2 iii. Mg + iv. Na + A. i only B. i and iii only. ii only D. ii and iii only E. ii and iv only 12. Which one of the following has the largest radius? A. Na B. Li. Mg D. E. l Go on to the next page

3 13. What is the frequency of the wave shown below assuming it is light (electromagnetic radiation)? A. 3.8! s 1 B s ! s 1 D. 1.9! s 1 E. 1.1! s Which of the following transitions in the Bohr hydrogen atom will emit the photon with the highest frequency? A. n = 1 to n = 6 B. n = 8 to n = 3. n = 3 to n = 1 D. n = 3 to n = 8 E. n = 6 to n = The ground state electron configuration of the cation Mn 2+ is A. [Ar] 4s 2 3d 5 B. [Ar] 4s 1 3d 6. [Ar] 4s 2 3d 4 4p 1 D. [Ar] 3d 5 E. [Ar] 4s 2 4d Which of the following could be an orbital diagram for a neutral oxygen atom in an excited state? 1s 2s 2p A. (#$) (#$) (#$) (# ) (# ) B. (#$) (# ) (#$ ) (# ) (# ). (#$) (#) (#$ ) (#$ ) (# ) D. (#$) (#$#) (##) ( ) ( ) E. (#$) (#$) (# ) (# ) (#$) 17. What is the maximum number of electrons with quantum number m! = 0 in the ground state electron configuration of sodium (Na)? A. 2 B D. 7 E What is the energy change when an electron in a hydrogen atom drops from n = 5 to n = 2? A. 276 kj B " 10 #19 J " 10 #19 J D " 10 #19 J E " 10 #19 J Go on to the next page

4 19. Which of the following compounds has the lowest melting point? A. Kl B. BaS. Ba D. Mg E. Nal 20. In the molecule below, which atom has the largest partial positive charge? A. l B. F. Br D. I E. 21. The central atom in which of the following molecules does not violate the octet rule? A. Il 4 B. KrF 2. l 2 D. F 4 E. BF 3 F l Br I 22. Which of the following statements is incorrect for the Lewis structure of N 2 4? A. a nitrogen-nitrogen triple bond B. each nitrogen has one nonbonding electron pair. each hydrogen has one bond to nitrogen D. there are two hydrogen atoms bonded to each nitrogen E. a nitrogen-nitrogen single bond 23. Put these in order of increasing frequency. i. visible light $ = 450 nm ii. infra red light $ = 10 µm iii microwave light $ = 10 mm A. i < ii < iii B. ii < i < iii. ii < iii < i D. i < iii < ii E. iii < ii < i 24. l in nature is composed of two isotopes of 35 l ( amu) and 37 l ( amu). What is the percentage of 37 l in nature? A. 24% B. 76%. 132% D. 32% E. Insufficient information Go on to the next page

25. Which of the following statements are true for the I 4 " ion? i. There are no resonance structures. ii. Iodine has a formal charge of zero. iii. The I- bond lengths are all equal. iv.

onsider the highest energy electron in the ground state electron configuration of arsenic (As). Which of the shapes below correspond to the orbital(s) occupied by this electron. 27.

5 25. Which of the following statements are true for the I 4 " ion? i. There are no resonance structures. ii. Iodine has a formal charge of zero. iii. The I- bond lengths are all equal. iv. The negative charge is localized on one atom. v. xygen uses 3d orbitals to form bonds to iodine A. (i) B. (ii) only. (i) and (iii) D. (iii) and (iv) E. (iii) and (v) 26. onsider the highest energy electron in the ground state electron configuration of arsenic (As). Which of the shapes below correspond to the orbital(s) occupied by this electron. 27. The Lewis structures for 2 acids and their anions are shown below. Which of these have % bonds that have the same lengths in the structure? i. acetic acid ii. carbonic acid 2 i. ii. iii iii. acetate ion iv. carbonate ion A. i only B. ii only. iii only D. ii or iii E. i or ii or iii A. all four B. none. (i) and (ii) D. (ii) only E. (iii) and (iv) Go on to the last page

6 28. Which of the following processes corresponds to the highest ionization energy? EMISTRY 110 EXAM 1 February 6, 2012 Answer Key A. e & e + + e " B. Ne & Ne + + e ". Na & Na + + e " D. Mg & Mg + + e " E. l & l + + e " END F EXAM FRM A 1. D 2. B 3. B 4. E 5. E 6. E B E 12. A 13. A D D 18. D 19. A 20. E 21. D 22. A 23. E 24. A B 27. E 28. A

CHEMISTRY 110 EXAM 1 SEPTEMBER 20, 2010 FORM A

CHEMISTRY 110 EXAM 1 SEPTEMBER 20, 2010 FORM A 1. What are the correct numbers of protons, neutrons and electrons in a 39 K + ion? p n e A. 20 19 18 B. 20 19 19 C. 19 20 18 D. 19 20 19 E. 20 19 20 2. Which