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While covalent bonds attach the atoms within the polyatomic ion, ionic bonds connect these polyatomic ions to their metal atoms. Only CCl4, which contains 4 C.
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This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering.
Bond Type Ionic 001 10.0 points Which pair of elements is most likely to form an ionic compound?
Explanation: Mg is a metal and F is a nonmetal. N and S are both nonmetals. O and Cl are both nonmetals. Na and Al are both metals.
Mlib 03 0009 002 10.0 points Compounds which are characterized as cova- lent are generally made up of elements found in which part of the Periodic Table?
Explanation: Covalent compounds are formed from ele- ments with small ∆EN , or nonmetal elements. These are found in the upper right corner of the periodic table. Very metallic elements are found in the lower left corner of the periodic table.
Bond Strength Order W 003 10.0 points Which is the correct order of increasing bond strength?
ChemPrin3e 02 74 004 10.0 points Which do you predict to have the strongest CN bond?
Mlib 03 0079 005 10.0 points Which of the following contains only covalent bonding and no ionic bonding?
metal. An ionic bond would be expected to form in this compound. In Na 2 SO 4 , Ca(NO 3 ) 2 , and NaOH, a polyatomic ion is present. While covalent bonds attach the atoms within the polyatomic ion, ionic bonds connect these polyatomic ions to their metal atoms. Only CCl 4 , which contains 4 C Cl bonds (which involve bonding between two nonmetallic elements), contains only covalent bonds.
Mlib 03 1107 006 10.0 points What total number of valence electrons should appear in the dot formula for the chlo- rate ion ClO− 3?
Explanation: Chlorine has 7 valence electrons and oxy- gen 6. The overall −1 charge indicates that there is 1 extra electron. The total number of valence electrons is 1 × 7 e−^ (from Cl) + 3 × 6 e−^ (from O) +1 e−^ (from −1 charge) = 26 e−
Brodbelt 07 09 007 10.0 points
What is the correct Lewis formula for oxy- gen (O 2 )?
bb bb b^ Ob
b b bb Ob b
bb bb Obb bb
b b bb Ob b
bb b^ Ob^
bb
bb Ob (^) b correct
bb bb bb O bb
b b bb b b
bb bb b^ Ob
b (^) b Obb
Explanation: N = 8 × 2 = 16 A = 6 × 2 = 12 S = N − A = 16 − 12 = 4 There are 4 shared electrons. The remain- ing electrons are placed around the oxygen atoms such that each has an octet. The Lewis dot formula for oxygen (O 2 ) is
bb bb b^ Ob^
bb
bb Ob b
Brodbelt 779 008 10.0 points How many lone pairs of electrons are on nitrogen in NF 3?
The Lewis structure is
bb b b Fbb
bb
bb Fbb bb
Fb^ b
bb bb
Brodbelt 8200410
bb bb^ F
b b bb Clb b
bb F bb
b b bb bb Cl
b b bb b b
bb Cl
bb bb
bb F Clbb
Explanation: The Lewis formula for chlorine fluoride (ClF) is
bb bb Fbb
b b bb Clb b
Mlib 03 1137 012 10.0 points Which of the following contains exactly one unshared pair of valence electrons?
Explanation: The PH 3 molecule contains exactly 1 un- shared pair of valence electrons:
H P^ ··^ H
H You can check this structure for correctness by verifying that each atom has the correct number of electrons around it (8 for most ele- ments, 2 for hydrogen) and that the structure shows the correct total number of valence elec- trons (calculated by adding up the available valence electrons from each atom). The C 2 H 4 molecule contains no unshared pairs; SiH 4 contains no unshared pairs; NaCl
(an ionic compound) contains 4 unshared pairs; and H 2 S contains 2 unshared pairs.
Mlib 72 0511 013 10.0 points Consider the following table of electronega- tivities.
H He 2.1 − Li Be B C N O F Ne 1.0 1.5 2.0 2.5 3.0 3.5 4.0 − Na Mg Al Si P S Cl Ar 0.9 1.2 1.5 1.8 2.1 2.5 3.0 −
Calculate the difference in electronegativity between C and N.
Explanation:
014 10.0 points The letters in the periodic table are used to identify four different elements.
Based on periodic table trends, which el- ement is expected to have the GREATEST tendency to attract a shared pair of electrons?
Explanation: Electronegativity (the ability to attract a shared pair of electrons) increases going to the right and upward in the periodic table.
Mlib 03 5043 015 10.0 points The electronegativity of nonmetals is rela- tively (high, low, the same) as compared to metals.
Explanation: Both electronegativity and nonmetallic character increase from left to right and from bottom to top of the Periodic Table.
Mlib 03 6039 016 10.0 points Which of the following elements would be ex- pected to have the highest electronegativity?
Explanation: Electronegativity generally increases from left to right and from bottom to top of the Periodic Table. The Noble gases are excluded in that they are rather inert.
Mlib 75 0067 017 10.0 points Generally speaking, in the periodic table, elec-
tronegativity (decreases, increases) in going from left to right and (decreases, increases) in going from top to bottom.
Mlib 50 5002 018 10.0 points Which of the following bonds will be the most polar?
Mlib 72 0532 019 10.0 points What is the difference in electronegativity be- tween H and F?
Mlib 75 0049 020 10.0 points Which bond is most polar?