TEST 2, Chapter 3 & 4. CHEM 120(01) Fall 2004, Name:_____________ Version 1
1. What constitutes a covalent bond between two atoms?
a. A charge attraction between ions formed losing/gaining electrons.
b. A attraction created by sharing two electron pairs.
c. Collection of ions in ionic lattice
d. Sharing of many electron as in metallic solids
2. Main reason for the atoms of the noble gas elements, Group VIII A (18), not
to form bonds with any other elements because,
a. they have larger atomic size than any other atom in the same period.
b. they are monatomic gases.
c. they already have an octet of electrons (except He)in their valence
shell.
d. they are nonmetals.
3. What do the letters VSEPR stand for?
a. Valence Sphere Electron Pair Repulsion
b. Valence Shell Electron Pack Repulsion
c. Valence Shell Electron Pair Repulsion
d. Very Small Electron Pair Repulsion
4. What does it mean if an atom is said to have a higher electronegativity?
a. The atom must be an metal.
b. It has more attraction for the electron pair of the covalent bond
formed with another atom.
c. It has less attraction for the electron pair of the covalent bond with
another atom.
d. It would a form a cation easily.
5. How any valence electrons in a chloride ion, NO3-.
a. 10
b. 20 c. 24
d.36
e. 40
6. Where are the alkaline earth metals located on the periodic table?
a. representative elements
b. transition metals
c. Group IA (1)
d. Group IIA (2)
e. Group IIIA (3)
7. If the shape of a molecule is trigonal planar, what are the values of the
bond angles?
a. 109.5 b. 120
c. 180 d. 90
8. The old name of iron(III) chloride is ferrous chloride. Charge on the iron
atom is
a. +1 b. +2 c. +3 d. +4
9. Who stated distinctly that the elements, when arranged according to their
atomic masses, showed a distinct periodicity of their properties?
a. Mendeleev and Meyer b. Doberiner
c. Newlands
d. Bohr
10. Which of the following elements has the highest ionization energy?
a. Li
b. B
c. O
d. F
11. For a representative element, number of valence electrons in a neutral atom
is
a. Obtained from the period number.
b. Obtain from the group numbers of the element (IA through VIIIA) in the
Periodic Table?
c. More than eight electrons.
d. Is hard to obtain from the Period table
12. What is the electron configuration of sulfur, atomic number 16?
a. 1s21p62s22p6
b. 1s22s22p62d6
c. 1s22s22p63s23p4
d. 1s22s22p63s23d4
e. 1s22s22p63s23p4
13. What is the name of Fe2+ in the Stock system?
a. Iron
b. Iron(I) c. Iron(II) d. Iron(III)
14.
Which of the following Lewis structures of ions is incorrect?
a.
15.
e. Iron (IV)
b.
c.
d.
In the compound CH3F the bond between carbon and chlorine is
a. intermolecular
b. ionic
c. nonpolar covalent
d. polar covalent
16. Predict the formula of the compound formed when ions of barium and nitrogen
combine.
a. BaN3 b.
c. Ba3N2 d. BaN e. BaN2
17. The elements with the most electronegativities are found in the _______
_______ region of the periodic table.
a. left top b. right top
c. right bottom
d. left top
18. The NO2
a. it
b. it
c. it
d. It
molecule can never satisfy the octet rule because
has 10 (even) valence electrons
has 17 (odd) valence electrons.
has 8 (even) valence electrons.
has 9 (odd) valence electrons.
19. The name of Na3PO4.
a. Sodium phosphate
d. Sodium phosphide
b. Nitrogen
phosphate
c. Sodium phosphite
20. According to VSEPR theory, in NH3 molecule, if the valence electrons on a
central atom are 3 bond pairs and one nonbonding (lone) pair, the geometry
(shape) at the nitrogen atom will be
a.
linear
b.
bent (angular)
c.
trigonal planar
d.
trigonal pyramidal
e.
tetrahedral
21. Which of the following elements is a metalloid or semi-metal?
a. C
b. Ge
c. Pb
d. N
e. P
22. Provide the name of CCl4.
a. Carbon chloride b. carbon tetraoxide
d. calcium tetrachloride
c. carbon tetrachloride
23. Assuming reactions between the following pairs of elements, which pair is
most likely to form an ionic compound?
a.
copper and tin
b.
chlorine and oxygen
c.
cesium and iodine
d.
carbon and chlorine
e.
fluorine and iodine
24. What is the name of Cu2O in the Stock system?
a. Copper(I)oxide b. Copper(II) oxide
c. Copper (III) oxide
d. Copper oxide
25. In the modern Periodic Table, the elements are arranged according to
their_____.
a. atomic mass b. atomic number
c. physical properties d. neutron number
26. Bonus problems: The ammonia molecule(NH3)is polar. Why does this fact
suggest?
a.
b.
c.
d.
NH3
NH3
NH3
NH3
is
is
is
is
trigonal
trigonal
trigonal
trigonal
planar which is
pyramidal which
planar which is
pyramidal which
a symmetric structure.
is a asymmetric structure.
an asymmetric structure.
is a symmetric structure.
27. Bonus problems: Which is not an intramolecular force?
a. Hydrogen bonding attraction.
b. Diople-dipole attraction.
c. London-dispersion attraction
d. Covalent bonds within a molecule