For Questions 1 through 3
Balance the following:
MnO4- (aq) + Br- (aq) ----> Mn2+ (aq) + Br2 (l) (acidic)
1. Which species is oxidized?
A. MnO4- B. Br- C. Mn2+ D. Br2 E. H+
2. How many electrons are exchanged in the balanced overall reaction?
A. 1 B. 2 C. 5 D. 10 E. 20
3. How many H
+ ions are in the balanced overall reaction?A. 2 B. 4 C. 8 D. 16 E. 20
4. Which half-reaction below could be described as oxidation?
A. Zn (s) -----> Zn2+ (aq)
B. 2Cl- (aq)
------> Cl2 (g)C. ClO3- (aq) ------> ClO4- (aq)
D. NO (g) ------> NO2 (g)
E. all of these
5. A species which loses electrons ________________.
A. is oxidized
B. is reduced
C. is an oxidizing agent.
D. has a decrease in oxidation number
E. none of these
For Questions 6 through 7
Balance the following:
S (s) + OCl- (aq) ----> SO32- (aq) + Cl- (aq) (basic)
6. Which species is the reducing agent?
A. S B. OCl- C. SO32- D. Cl- E. H
2O7. How many OH
- ions are in the balanced overall reaction?A. 1 B. 2 C. 3 D. 4 E. 5
8. What is the oxidation number of chlorine in HClO
4 ?A. +3 B. +4 C. +5 D. +6 E. +7
9. The lowest energy state for an electronic system is called
A. the ground state.
B. the excited state.
C. the magnetic state.
D. the azimuthal state.
E. a quantum singularity.
10. The _______________ quantum number refers to the subshells in the electronic structure.
A. Principal
B. Angular Momentum
C. Magnetic
D. Spin
E. Subatomic
11. Which of the following frequencies of radiation corresponds to the shortest wavelength?
A. 6.26 x 1014 Hz
B. 1.24 x 1013 Hz
C. 3.55 x 1012 Hz
D. 2.42 x 1011 Hz
E. 5.31 x 1010 Hz
12. Calculate the energy of one photon of light with the wavelength of 360 nm?
A. 1.26 x 1048 J
B. 8.33 x 1014 J
C. 5.52 x 10-19 J
D. 1.20 x 10-15 J
E. 7.95 x 10-49 J
13. In its lowest energy state, which of the following would be a diamagnetic species ?
A. Na B. F C. Fe3+ D. Ca2+ E. all of these
14. Based on Bohr’s Theory, an electron moves from the energy level n = 3 to the energy
level n = 1 when
A. energy is released by the electron.
B. energy is absorbed by the electron.
C. a proton is lost from the nucleus.
D. the electron is excited by heat energy.
E. the electron is excited by electrical energy.
15. The number of orbitals in an s subshell is:
A. 1 B. 2 C. 3 D. 5 E. 7
16. A possible set of quantum numbers for a "4d" electron is
n l m
l msA. 4 1 0 -
B. 3 1 0 -
C. 4 2 3 -
D. 3 1 1 +
E. 4 2 1 +
17. A species that is isoelectronic with S2- must contain ______ electrons.
A. 2 B. 6 C. 8 D. 16 E. 18
18. All halogens have the electron configuration, ___________, for their outermost shell (n) .
A. ns2 np2
B. ns2 np3
C. ns2 np4
D. ns2 np5
E. ns2 np6
19. "Electrons are filled in the orbitals from lowest to highest energy" would be one way of
restating
A. the Pauli Exclusion Principle
B. the Aufbau Principle
C. the Heisenberg Uncertainty Principle
D. De Broglie's relation
E. Dalton's Atomic Theory
20. How many unpaired electrons are in the ground state electron configuration of Mn?
A. 1 B. 2 C. 3 D. 4 E. 5
21. The correct electron configuration for Sb is:
A. [Kr]5s25d105p3
B. [Kr]4s24d104p3
C. [Kr]5s24d105p3
D. [Kr]5s25d105p3
E. [Xe]5s25d105p3
22. When cobalt forms a +3 ion, the first electrons are lost from
A. the 1s subshell
B. the 3d subshell
C. the 4p subshell
D. the 4s subshell
E. the 3s subshell
23. The number of valence electrons in a nitrogen atom is
A. 1 B. 3 C. 5 D. 7 E. 9
24. Which of the following comparisons is true concerning size?
A. Na+ > Na B. Ca > K+ C. S > Al D. Ne > Ar E. O > F-
25. Which of the following statements are true concerning ionization energy?
A. Larger atoms have larger ionization energies.
B. There is no relationship between atomic size and ionization energy.
C. In a given atom, more energy is required to remove two electrons than one.
D. Ionization energy increases as you move from right to left across the periodic table.
E. all of these are true
26. Which of the following would have the greatest atomic radius?
A. F B. Cl C. Br D. I E. At
27. From which of the following could an electron be most easily removed:
A. Cl B. K+ C. K D. Ca+ E. Ar