Docsity
Docsity

Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity


Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan


Guidelines and tips
Guidelines and tips

Version 001 – HW12-Bonding – sparks – (52100), Lecture notes of Chemistry

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.

Typology: Lecture notes

2021/2022

Uploaded on 09/12/2022

prindhorn
prindhorn 🇺🇸

4.6

(11)

279 documents

1 / 6

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Version 001 HW12-Bonding sparks (52100) 1
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?
1. magnesium and fluorine correct
2. nitrogen and sulfur
3. oxygen and chlorine
4. sodium and aluminum
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?
1. lower left
2. left and right
3. upper right correct
4. upper left
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?
1. single, triple, double
2. double, single, triple
3. double, triple, single
4. triple, double, single
5. single, double, triple correct
Explanation:
More energy is required to break a triple
bond than a double bond, and more energy
for a double bond than a single bond.
ChemPrin3e 02 74
004 10.0 points
Which do you predict to have the strongest
CN bond?
1. HCN correct
2. All are equal
3. NHCH2
4. NH2CH3
Explanation:
The bond orders as determined by drawing
the Lewis structures are 2 for NHCH2, 1 for
NH2CH3, and 3 for HCN; therefore HCN will
have the greatest bond strength.
Mlib 03 0079
005 10.0 points
Which of the following contains only covalent
bonding and no ionic bonding?
1. NaOH
2. CCl4correct
3. NaCl
4. Ca(NO3)2
5. Na2SO4
Explanation:
In NaCl, Na is a metal, and Cl is a non-
pf3
pf4
pf5

Partial preview of the text

Download Version 001 – HW12-Bonding – sparks – (52100) and more Lecture notes Chemistry in PDF only on Docsity!

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?

  1. magnesium and fluorine correct
  2. nitrogen and sulfur
  3. oxygen and chlorine
  4. sodium and aluminum

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?

  1. lower left
  2. left and right
  3. upper right correct
  4. upper left

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?

  1. single, triple, double
  2. double, single, triple
  3. double, triple, single
  4. triple, double, single
  5. single, double, triple correct Explanation: More energy is required to break a triple bond than a double bond, and more energy for a double bond than a single bond.

ChemPrin3e 02 74 004 10.0 points Which do you predict to have the strongest CN bond?

  1. HCN correct
  2. All are equal
  3. NHCH 2
  4. NH 2 CH 3 Explanation: The bond orders as determined by drawing the Lewis structures are 2 for NHCH 2 , 1 for NH 2 CH 3 , and 3 for HCN; therefore HCN will have the greatest bond strength.

Mlib 03 0079 005 10.0 points Which of the following contains only covalent bonding and no ionic bonding?

  1. NaOH
  2. CCl 4 correct
  3. NaCl
  4. Ca(NO 3 ) 2
  5. Na 2 SO 4 Explanation: In NaCl, Na is a metal, and Cl is a non-

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?

  1. 28
  2. 26 correct
  3. 24
  4. 32
  5. 30

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

  1. (^) bb

bb bb Obb bb

b b bb Ob b

  1. (^) bb O bbbbbb (^) O bb
  2. bb

bb b^ Ob^

bb

bb Ob (^) b correct

  1. (^) O bb

bb bb bb O bb

  1. (^) O bb

b b bb b b

O

bb bb b^ Ob

b (^) b Obb

  1. (^) O bb O

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?

  1. thirteen
  2. four
  3. one correct
  4. twenty
  5. none
  6. ten
  7. three
  8. two Explanation:

The Lewis structure is

N

bb b b Fbb

bb

bb Fbb bb

Fb^ b

bb bb

Brodbelt 8200410

bb bb^ F

b b bb Clb b

  1. (^) bb F Clbb

bb F bb

b b bb bb Cl

8. F

b b bb b b

bb Cl

  1. (^) F (^) 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?

  1. SiH 4
  2. PH 3 correct
  3. NaCl
  4. C 2 H 4
  5. H 2 S

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.

1A 2A 3A 4A 5A 6A 7A 8A

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.

  1. 0.5 correct

Explanation:

CIC T05 15

014 10.0 points The letters in the periodic table are used to identify four different elements.

A B C D

Based on periodic table trends, which el- ement is expected to have the GREATEST tendency to attract a shared pair of electrons?

  1. A
  2. D
  3. B
  1. C correct

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.

  1. low
  2. high correct
  3. the same

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?

  1. Al
  2. P
  3. Na
  4. N correct
  5. C
  6. He

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.

  1. increases; decreases correct
  2. increases; increases
  3. decreases; decreases
  4. decreases; increases Explanation: As the elements become less metallic their electronegativities increase.

Mlib 50 5002 018 10.0 points Which of the following bonds will be the most polar?

  1. S F correct
  2. C N
  3. C H
  4. Cl O Explanation:

Mlib 72 0532 019 10.0 points What is the difference in electronegativity be- tween H and F?

  1. 1.9 correct Explanation: On the Pauling scale the electronegativities of H and F are 2.1 and 4.0, respectively.

Mlib 75 0049 020 10.0 points Which bond is most polar?