Which response includes only the true statements concerning the characteristics of ionic compounds? I. All atoms in the compounds share electrons. II. The compounds are gases at room temperature. III. The compounds have high melting points. IV. Many are

1
Which response includes only the true statements
concerning the characteristics of ionic
compounds? I. All atoms in the compounds share
electrons.II. The compounds are gases at room
temperature.III. The compounds have high melting
points.IV. Many are soluble in polar
solvents.V. Aqueous solutions of these compounds
are poor conductors of electricity.

1. I, II, and IV
2. I and V
3. II and III
4. IV and V
5. III and IV

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2
Consider the following electron transfer diagram
representing the formation of a binary ionic
compound from atoms of its constituent elements.
Which response correctly identifies the elements?
image

1. M Be, X F
2. M Mg, X Cl
3. M Na, X O
4. M Mg, X F
5. M Ca, X Cl

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3
Of the following, which are isoelectronic with
Kr?S2-, Ar, K, Sr2, Br -

1. S2-, Ar, and K
2. Ar and Sr2
3. K and Sr2
4. Sr2 and Br -
5. S2- and Br -

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4
Which response includes all of the true
statements about Se2-?I. Se2- has eight
electrons in its outermost shell.II. Se2- has
the same electronic configuration as
krypton.III. Se2- has chemical properties
similar to those of the noble gases.IV. Se2- is
likely to be a gas at reasonable temperatures and
pressures.V. Se2- has the same number of
electrons as Rb.VI. The properties of Se2- are
more similar to those of S2- than to those of Br-.

1. I, II, and III
2. II, III, and IV
3. III and V
4. I, II, V, and VI
5. II, III, and IV, and V

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5
What is the formula for the binary ionic compound
formed by potassium (element 19) and iodine
(element 53)?

1. KI
2. K2I
3. KI2
4. K3I2

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6
Which of the following formulas is incorrect?

1. CaBr2
2. NaI
3. Cs2S
4. Na2As
5. Li2O

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7
As two hydrogen atoms approach each other, the
electron of each hydrogen atom is attracted by
the nucleus of the other hydrogen atom as well as
by its own nucleus. The electrons are shared
between the two hydrogen atoms, and a hydrogen
molecule is formed. The attractive forces between
electrons and nuclei are opposed by a repulsive
force between the positively charged nucleus of
each atom. A plot of the potential energy of the
H2 molecule vs. internuclear distance shows a
minimum potential energy of -435 kJ/mol at an
internuclear distance of 0.74 Å. Which of the
following statements is incorrect?

1. The highest electron density for the two
   electrons of H2 is in the region between the two
   atoms.
2. The distance between the two hydrogen nuclei in a
   stable H2 molecule is 0.74 Å.
3. As the internuclear distance becomes smaller than
   0.74 Å, the repulsive forces of the nuclei
   increase more rapidly than the attractive forces
   increase.
4. As the internuclear distance becomes greater than
   0.74 Å, the attractive forces decrease faster
   than the repulsive forces decrease.
5. The hydrogen molecule is most stable at an
   internuclear distance of 0.74 Å

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8
Which response lists all of the correct Lewis dot
formulas and no incorrect ones? image

1. I, II, and IV
2. I and III
3. II, III, and IV
4. II and IV
5. I, II, and III

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9
The total number of unshared pairs of electrons
in the N2 molecule is _____.

1. one
2. two
3. three
4. four
5. zero

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10
Which one of the following molecules contains a
triple bond?

1. AsF3
2. NH3
3. C2H2
4. H2CO (Hint The C is the central atom.)
5. HOF (Hint The O is the central atom.)

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11
Assign a formal charge to each atom of CSeS,
image .

1. C 4, Se 2-, S 2-
2. C 2, Se 1-, S 1-
3. C 0, Se 0, S 0
4. C 8, Se 4-, S 4-
5. C 0, Se 1-, S 1

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12
Which response contains all the molecules below
that violate the octet rule, and no others?BI3,
H2Se, SbF5, BeBr2

1. BI3
2. H2Se
3. SbF5 and BeBr2
4. BI3, SbF5, and BeBr2
5. BI3 and H2Se

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13
Which would be classified as a polar covalent
bond?

1. C-S bond in CS2
2. N-Cl bond in NCl3
3. C-I bond in CI4
4. F-F bond in F2
5. Br-Cl bond in BrCl

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14
Which one of the compounds below has the bonds
that are least polar? Electronegativities H
2.1, S 2.5, P 2.1, As 2.1, Cl 3.0, Si
1.8, Sb 1.9

1. H2S
2. PH3
3. AsCl3
4. SiH4
5. SbCl3

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15
Which response includes all the species listed
below that contain both ionic and covalent bonds,
and no other species? SiF4, PCl3, LiClO4, SF6,
Al2(SO4)3

1. SiF4, SF6
2. PCl3, LiClO4
3. LiClO4, SF6, Al2(SO4)3
4. SiF4, PCl3, SF6
5. LiClO4, Al2(SO4)3

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