Chemistry Midterm1vAmultchoiceans

7/27/2019 Chemistry Midterm1vAmultchoiceans

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PART I – Multiple Choice. Select the best response for each question below . [Total marks = 30]

1. This is exam version A. Mark “A” as the answer to question 1 on the optical sense form.

2. The existence of discrete (quantized) energy levels in an atom may be inferred from:

A) diffraction of electrons by crystalsB) atomic line spectra

C) blackbody radiationD) experiments with the photoelectric effect

E) The Uncertainty Principle

3. The energy of a photon that has a wavelength of 12.3 nm is __________ J.

A) 1.99 x 10-25

B) 1.62 x 10

-17

C) 1.62 x 10-26

D) 4.42 x 10-23 E) 1.51 x 10

-17

4. What is the wavelength associated with an electron traveling at 0.01 times the speed of light ?

A) 242 nmB) 0.242 nm

C) 2.42 x 10-3

nmD) 7.98 x 10

-2nm

E) 1.33 x 10-4

nm

5. An orbital is a reference toi) the circular path which an electron travels within an atom

ii) a region in an atom where an electron is likely to be foundiii) solutions to the Schrödinger equation

iv) any equation that has wave-like properties

A) i onlyB) i , ii and iii

C) ii and iiiD) iii only

E) iii and iv

6. Which of the subshells below do not exist due to the constraints upon the azimuthal quantum number (l) ?

A) 3dB) 4s

C) 4pD) 3f

E) none of the above



Chem 101, MidTerm Test 1 Version A page 2 of 8

7. Using the notation (n, l, ml, ms), which set of quantum numbers does not fit any electron in a ground stateiodine (I) atom?

A) (5, 0, 0, +1/2)

B) (4, 1, +1, -1/2)C) (3, 2, -1, -1/2)

D) (4, 3, +1, -1/2)E) (4, 2, -1, -1/2)

8. Which of the following statements is correct concerning many-electron atoms:

i) 3p and 3d orbitals do not have the same energyii) The Pauli Exclusion Principle determines how many electrons can occupy an orbital

iii) The five 4d orbitals are not degenerateiv) The energy required to remove an electron from the 1s orbital is different for each element

A) ii and iii

B) i, ii and iii

C) i, ii and ivD) iii and ivE) ii, iii and iv

9. An electron in a(n) ___________ subshell experiences on the average the greatest nuclear attraction

in a many-electron atom.

A) 3p B) 4s C) 3d D) 2s E) 4f

10. Which electron configuration(s) is not allowed for an atom ?

A)

B)

C)

D)

E) None of the above.




11. Which one of the following is the correct electron configuration for a ground-state nitrogen atom?A)

B)

C)

D)

E) None of the above.

12. In order for two orbitals in a many-electron atom to be degenerate, which quantum numbers have to bethe same for those orbitals?

A) n, l, and ml

B) n onlyC) n and l only

D) ms onlyE) n, l, ml, and ms

13. The correct condensed electron configuration of a ground-state lead (Pb) atom is __________.

A) [Kr]5s24d

105p

2

B) [Rn]5s24d105p2

C) [Xe]5s24d

105p

2

D) [Xe]6s24f

105d

106p

2

E) [Xe]6s24f 145d106p2




Consider the following electron configurations to answer the question that follows:

(i) 1s22s

22p

63s

23p

64s

23d

104p

65s

1

(ii) 1s22s

22p

63s

23p

5

(iii) 1s22s

22p

63s

23p

64s

23d

8

(iv) 1s22s

22p

63s

23p

64s

23d

104p

6

(v) 1s22s22p53s1

14. The electron configuration of an element (in its ground state) with the smallest number of outer-shell or valence electrons is __________.

A) (i) B) (ii) C) (iii) D) (iv) E) (v)

15. The value of the azimuthal quantum number (l) for the orbitals being filled in "region" z is __________.

A) 0 B) 1 C) 2 D) 3 E) 4

Consider the following electron configurations to answer the question that follows:

(i) 1s22s

22p

63s

23p

64s

23d

104p

6

(ii) 1s22s22p63s23p6

(iii) 1s22s

22p

63s

23p

54s

23d

6

(iv) [Ne]2s22p

4

(v) [Kr]5s24d105p4

16. Which electron configuration represents an element in group 6A (16) ?

A) (i) B) (ii) C) (iii) D) (iv) E) (v)

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