Download Exam 3 Review - Iowa State University

Exam 3 Review
Supplemental Instruction
Iowa State University
Leader:
Course:
Instructor:
Date:
Emily
Chem 177
Appy
4/10/16
1. Write the noble gas core electron configuration for the following species:
a. Mg
b. Zn2+
2. [Ar]4s23d6 is the electron configuration of a(n)___________ atom.
3.
4. Which of the following is an excited-state electron configuration?
a) 1s2 2s2 3p1
b) 1s2 2s2 2p6
c) 1s2 2s2 2p4 3s1
d) [Ar] 4s2 3d10 4p1
5. Draw Lewis structures for the following molecules. Give the shape of the molecule,
polarity of the overall molecule, and the bond angle(s).
a. CH2F2
b. OF2
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c. PO33-
d. BCl3
e. BeF2
f. PBr5
6. Given the following electronegativities, which covalent bond is the most polar?
Element
Electronegativity
a.
b.
c.
d.
e.
H
2.1
C
2.5
N
3.0
O
3.5
C-H
N-H
O-H
O-C
O-N
7. Of the following, which gives the correct order for atomic radius for Mg, Na, P, Si and
Ar?
a. Mg>Na>P>Si>Ar
b. Ar>Si>P>Na>Mg
c. Si>P>Ar>Na>Mg
d. Na>Mg>Si>P>Ar
e. Ar>P>Si>Mg>Na
8. Which of the following has the smallest ionization energy.
a. Mg
b. Se
c. Ba
d. Po
9. Which has the largest 2nd Ionization energy between K and Ca?
a. K
b. Ca
c. Both K and Ca have the same second Ionization energy
d. It’s impossible to tell
10. In terms of electronegativity, determine whether the following compounds contain
nonpolar covalent, polar covalent, or ionic bonds.
a. I—I
b. NaI
c. Cl—I
d. H—I
11. Based on their positions in the periodic table, select the atom of each pair that has the
larger value of the indicated atomic property.
a. Ionization energy, Na or Mg
b. Ionization energy, Mg or Cl
c. Electron affinity, Cl or Br
d. Atomic radius, K or Cs
e. Atomic radius, Se or Br
12. List three properties that distinguish nonmetals from metals.
13. Which of the following are solids at room temperature, and which are gases?
a. CO2
b. BaO
c. CuO
d. F2
e. NO
14. Which substances are ionic and which are covalent?
a. Br2
b. KO2
c. AsH3
d. SO2
e. Ca(ClO4)2
15. Which substance should form an acidic solution in water?
a. Na2O
b. SO2
c. CO
d. BaO
16. Which of the following is the largest in size?
a. Clb. Cl
c. I+
d. I17. When an alkali metal reacts with water, a metal hydroxide and a gas form. Which gas
forms?
a. Carbon dioxide
b. Oxygen
c. Ozone
d. Hydrogen
18. Give the correct order of increasing radii for the isoelectronic series: Rb+, Sr2+, Se2-, Br –
19. Which has the larger lattice energy, MgO or SrO?
20. Arrange the following pairs of covalently bonded atoms in expected order of increasing
bond polarity: C-N, P-Cl, I-Cl, and C-O.
21. Draw all appropriate Lewis structures for ClNO2.
a. What are the formal charges of Cl, N, and O in each structure?
b. Are any of the oxygen atoms equivalent?
c. What nitrogen- and oxygen-containing ion is isoelectronic with ClNO2?
22. Which contains a multiple bond in its Lewis structure?
a. ICl
b. SO2
c. Cl2
d. NH4+
e. CaI2
23. Find the enthalpy of reaction for the following equation.
2 CH3OH(l) + 3 O2(g)  2 CO2(g) + 4 H2O(g)
C-H
C-O
C=O
O=O
O-H
414 kJ/mol
360 kJ/mol
799 kJ/mol
498 kJ/mol
464 kJ/mol