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General Chemistry I - Exam 3 with Answer Key | CHEM 1110, Exams of Chemistry

Roane State Community CollegeChemistry
Prof. James B. Condon

Material Type: Exam; Professor: Condon; Class: General Chemistry I; Subject: Chemistry; University: Roane State Community College; Term: Fall 2006;

Typology: Exams

Pre 2010

Uploaded on 08/17/2009

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CHEM 1110 test 3 for fall 2006 Page 1
Circle the correct answer on the answer sheet.
ΔxΔp = h λp = h h = 6.64 × 10–34 J s
1. Which of the following is a correct set of quantum numbers according to the selection rules?
a. n = 2, l = 1, ml = 2, ms = –1/2
b. n = 2, l = 0, ml = 1, ms = –1/2
c. n = 2, l = 0, ml = –1, ms = +1/2
d. n = 3, l = 2, ml = –2, ms = +1/2
e. n = 1, l = 1, ml = 0, ms = +1/2
2. Which of the following are possible quantum numbers for the last electron placed into the
ground state for nitrogen according to the aufbau principle?
a. n = 2, l = 1, ml = 0, ms = +1/2
b. n = 2, l = 0, ml = 0, ms = +1/2
c. n = 3, l = 1, ml = 0, ms = +1/2
d. n = 1, l = 1, ml = 0, ms = +1/2
e. n = 1, l = 0, ml = 0, ms = +1/2
3. What is the electron configuration for silicon, Si, according to the aufbau principle?
a. [Ne] 3s2 3p2b. [Ne] 3p4c. [Ar] 3s2 3p2d. [Ne] 3s4e. [He] 3s2 3p2
4. What is the electron configuration for tungsten, W, according to the aufbau principle?
a. [Xe]4f145d7b. [Xe]6s24f145d3c. [Xe]6s24f155d3d. [Xe]6s24f135d5 e. [Xe]6s24f145d4
5. Which of the following has a highest electron ionization energy?
a. Mg b. Be c. Sr d. Ba e. Ra
6. Which of the following has a highest electron affinity?
a. Ge b. Sb c. Sn d. Bi e. As
7. Which of the following atoms has the largest covalent radius?
a. O b. N c. Ir d. Ba e. Mg
pf3
pf4
pf5

Partial preview of the text

Download General Chemistry I - Exam 3 with Answer Key | CHEM 1110 and more Exams Chemistry in PDF only on Docsity!

Circle the correct answer on the answer sheet.

Δ x Δ p = h λ p = h h = 6.64 × 10–34^ J s

  1. Which of the following is a correct set of quantum numbers according to the selection rules?

a. n = 2, l = 1, ml = 2, ms = –1/ b. n = 2, l = 0, ml = 1, ms = –1/ c. n = 2, l = 0, ml = –1, ms = +1/ d. n = 3, l = 2, ml = –2, ms = +1/ e. n = 1, l = 1, ml = 0, ms = +1/

  1. Which of the following are possible quantum numbers for the last electron placed into the ground state for nitrogen according to the aufbau principle?

a. n = 2, l = 1, ml = 0, ms = +1/ b. n = 2, l = 0, ml = 0, ms = +1/ c. n = 3, l = 1, ml = 0, ms = +1/ d. n = 1, l = 1, ml = 0, ms = +1/ e. n = 1, l = 0, ml = 0, ms = +1/

  1. What is the electron configuration for silicon, Si, according to the aufbau principle?

a. [Ne] 3s^2 3p^2 b. [Ne] 3p^4 c. [Ar] 3s^2 3p^2 d. [Ne] 3s^4 e. [He] 3s^2 3p^2

  1. What is the electron configuration for tungsten, W, according to the aufbau principle?

a. [Xe]4f^14 5d^7 b. [Xe]6s^2 4f^14 5d^3 c. [Xe]6s^2 4f^15 5d^3 d. [Xe]6s^2 4f^13 5d^5 e. [Xe]6s^2 4f^14 5d^4

  1. Which of the following has a highest electron ionization energy?

a. Mg b. Be c. Sr d. Ba e. Ra

  1. Which of the following has a highest electron affinity?

a. Ge b. Sb c. Sn d. Bi e. As

  1. Which of the following atoms has the largest covalent radius?

a. O b. N c. Ir d. Ba e. Mg

*a triple bond is not to be considered as containing a double bond.

  1. Phosphorous has a higher electron ionization energy than sulfur. The reason for this is:

a. the p^6 is the most favored configuration. b. this follows the general trend in the periodic chart from Fr to F. c. due to Hund’s rule the p 3 is more stable configuration than the p 4. d. for atoms on the right side, the 2 s electrons are promoted to the p level for stability. e. there doesn’t seem to be any reason for this, one simply has to memorize the fact.

  1. The Pauli exclusion principle implies that:

a. the half filled p has extra stability. b. the p^6 is the most favored configuration. c. photons may have identical quantum numbers. d. no two electrons in the same atom may have the same n, l, ml and ms values. e. all the atoms of the periodic chart may be described using the wave functions of the H atom.

  1. Which of the following stable ions has the smallest ionic radius?

a. Al 3+^ b. Fr +^ c. Na +^ d. Mg 2+^ e. In3+

  1. Which of the following molecules has 1 and only 1 lone (unshared) pair of electrons about the central atom? a. CH 4 b. IF 3 c. H 2 O d. SF 6 e. NH 3
  2. Which of the following molecules or ions has a double bond *?

a. H 3 CCH 3 b. SO 4 2–^ c. HNNH d. IF 2 –^ e. HCN

  1. Which of the following molecules or ions has a resonance structure?

a. CH 3 CHCH 2 b. HCN c. ClO 4 –^ d. HCOO–^ e. SO 4 2–

  1. For which of the following molecules is the rotation hindered thus providing cis-trans isomers? a. FHNNHF b. HCCH c. HCN d. FH 2 CCHF 2 e. FHCCHF

NAME

(Print clearly)

Answer sheet - circle the correct letter for the answer

  1. a. b. c. d. e.
  2. a. b. c. d. e.
  3. a. b. c. d. e.
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  20. a. b. c. d. e.

Answer Key 1.d 2.a 3.a 4.e 5.b 6.e 7.d 8.c 9.d 10.a 11.e 12.c 13.d 14.e 15.a 16.a 17.c 18.d 19.a 20.e