Quiz # 7

deadline is May 8 (midnight)

Completion of this quiz gives you up to 7 credit points. The actual score will depend on the accuracy of your answers. You may work in groups but don't just follow somebody's opinion, make you decision consciously. If you find the quiz difficult, you should review the troublesome concepts. You may take as long as you want (within the deadline) to complete this quiz. It might be a good idea to have your lecture notes and/or your text book handy. Please note that if Student ID is wrong, or you submit your answers after the deadline then no credit will be given

 

1) Which of the following species is NOT isoelectronic to the others?

a) Br-
b) Kr
c) Ca2+
d) As3-
e) Y3+

2) Which of the following statements regarding ionization energy is NOT true?

a) Ionization energy is the energy required to remove a mole of electrons from a mole of gas-phase atoms or ions.
b) The ionization energy increases as Zeff increases..
c) Anomalies in ionization energy trends can occur due to electron pairing in orbitals.
d) Atoms in the same column of the periodic table have equal ionization energies.
e) Ionization energies are always positive because it takes energy to pull the negative electron away from the positive nucleus.

3) Which of the following shows the correct expression for the ionization energy indicated?

a) IE3: Al(g) --> Al3+(g) + 3e-
b) IE1: Cl(g) --> Cl+(g) + e-
c) IE2: Mg(g) --> Mg2+(g) + 2e-
d) IE1: Na+(g) --> Na2+(g) + e-
e) IE3: O2(g) --> O2+(g) + e-
f) b and d

4) Which of the following statements regarding electron affinity is true?

a) Electron affinity values are usually negative because the association of an electron with a positive nucleus should produce an ion that is more stable.
b) Zeff has no impact on electron affinity values.
c) Electron affinities generally become more positive as atomic size increases.
d) The electron affinities of the noble gases are positive or zero.
e) Electron pairing in orbitals can impact electron affinity.
f) b and e

5) Which type of ion is not typical?

a) Ca2+
b) K+
c) S2-
d) N3+
e) Zn2+

6) What is the name of Cr2O3 ?

a) Chromium oxide
b) Dihromium trioxide
c) Chromium (II) oxide
d) Chromium (III) oxide

7) What is the proper formula for scandium oxide ?

a) ScO
b) Sc2O3
c) Sc3O2
d) Sc2O2
e) Sc2O4

Please make comments about the lectures this week or anything else concerning the class. It is optional, you can submit your answers first and then your comments separately.

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