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Place the following elements in order of decreasing electronegativity. S F Te


A) Te > S > F
B) F > Te > S
C) Te > F > S
D) S > F > Te
E) F > S > Te

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Which molecule or compound below contains a pure covalent bond?


A) Li2CO3
B) SCl6
C) Cl2
D) P Br3
E) Li F

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Describe a covalent bond.

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a bond for...

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Place the following in order of decreasing X-A-X bond angle,where A represents the central atom and X represents the outer atoms in each molecule. N2O NCl3 NO2⁻


A) NCl3 > NO2⁻ > N2O
B) NO2⁻ > N2O > NCl3
C) N2O > NO2⁻ > NCl3
D) NCl3 > N2O > NO2⁻
E) N2O > NCl3 > NO2⁻

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Rank the following molecules in decreasing bond energy. Cl2 Br2 F2 I2


A) I2 > Br2 > Cl2 > F2
B) Cl2 > Br2 > F2 > I2
C) I2 > Cl2 > Br2 > F2
D) Cl2 > I2 > F2 > Br2

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Which of the following elements can form compounds with an expanded octet?


A) As
B) C
C) Li
D) F
E) All of the above elements can form compounds with an expanded octet.

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Of the following elements,which has the highest electronegativity?


A) P
B) S
C) Ti
D) As

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Identify the number of electron groups around a molecule with an octahedral shape.


A) 6
B) 2
C) 3
D) 4
E) 5

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Give the number of valence electrons for CH2Cl2.


A) 16
B) 18
C) 20
D) 22
E) 12

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Choose the best Lewis structure for CH2Cl2.


A) Choose the best Lewis structure for CH<sub>2</sub>Cl<sub>2</sub>. A) B) C) D) E)
B) Choose the best Lewis structure for CH<sub>2</sub>Cl<sub>2</sub>. A) B) C) D) E)
C) Choose the best Lewis structure for CH<sub>2</sub>Cl<sub>2</sub>. A) B) C) D) E)
D) Choose the best Lewis structure for CH<sub>2</sub>Cl<sub>2</sub>. A) B) C) D) E)
E) Choose the best Lewis structure for CH<sub>2</sub>Cl<sub>2</sub>. A) B) C) D) E)

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Choose the best Lewis structure for OCl2.


A) Choose the best Lewis structure for OCl<sub>2</sub>. A) B) C) D) E)
B) Choose the best Lewis structure for OCl<sub>2</sub>. A) B) C) D) E)
C) Choose the best Lewis structure for OCl<sub>2</sub>. A) B) C) D) E)
D) Choose the best Lewis structure for OCl<sub>2</sub>. A) B) C) D) E)
E) Choose the best Lewis structure for OCl<sub>2</sub>. A) B) C) D) E)

Correct Answer

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Determine the electron geometry (eg) and molecular geometry (mg) of NCl3.


A) eg = tetrahedral, mg = tetrahedral
B) eg = linear, mg = trigonal planar
C) eg = trigonal planar, mg = bent
D) eg = linear, mg = linear
E) eg = tetrahedral, mg = trigonal pyramidal

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Identify the shortest bond.


A) single covalent bond
B) double covalent bond
C) triple covalent bond
D) All of the above bonds are the same length.

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Draw the best Lewis structure for CH3-1.What is the formal charge on the C?


A) 0
B) 1
C) -1
D) 2

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Determine the electron geometry (eg) and molecular geometry (mg) of XeF4.


A) eg = tetrahedral, mg = tetrahedral
B) eg = linear, eg = linear
C) eg = tetrahedral, mg = bent
D) eg = trigonal bipyramidal, mg = tetrahedral
E) eg = octahedral, mg = square planar

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Place the following in order of increasing X-A-X bond angle,where A represents the central atom and X represents the outer atoms in each molecule. HCN H2O H3O⁺


A) HCN < H2O < H3O⁺
B) H3O⁺ < H2O < HCN
C) HCN < H3O⁺ < H2O
D) H2O < HCN < H3O⁺
E) H2O < H3O⁺ < HCN

Correct Answer

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Identify the compound with atoms that have an incomplete octet.


A) ICl5
B) CO2
C) BF3
D) Cl2
E) CO

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Which of the following resonance structures for OCN⁻ will contribute most to the correct structure of OCN⁻?


A) O(2 lone pairs) Which of the following resonance structures for OCN⁻ will contribute most to the correct structure of OCN⁻? A) O(2 lone pairs) C N (2 lone pairs) B) O(1 lone pair) C-N(3 lone pairs) C) O(1 lone pair) C(2 lone pairs) N(1 lone pair) D) O(3 lone pairs) -C N(with 1 lone pair) E) They all contribute equally to the correct structure of OCN⁻. C Which of the following resonance structures for OCN⁻ will contribute most to the correct structure of OCN⁻? A) O(2 lone pairs) C N (2 lone pairs) B) O(1 lone pair) C-N(3 lone pairs) C) O(1 lone pair) C(2 lone pairs) N(1 lone pair) D) O(3 lone pairs) -C N(with 1 lone pair) E) They all contribute equally to the correct structure of OCN⁻. N (2 lone pairs)
B) O(1 lone pair) Which of the following resonance structures for OCN⁻ will contribute most to the correct structure of OCN⁻? A) O(2 lone pairs) C N (2 lone pairs) B) O(1 lone pair) C-N(3 lone pairs) C) O(1 lone pair) C(2 lone pairs) N(1 lone pair) D) O(3 lone pairs) -C N(with 1 lone pair) E) They all contribute equally to the correct structure of OCN⁻. C-N(3 lone pairs)
C) O(1 lone pair) Which of the following resonance structures for OCN⁻ will contribute most to the correct structure of OCN⁻? A) O(2 lone pairs) C N (2 lone pairs) B) O(1 lone pair) C-N(3 lone pairs) C) O(1 lone pair) C(2 lone pairs) N(1 lone pair) D) O(3 lone pairs) -C N(with 1 lone pair) E) They all contribute equally to the correct structure of OCN⁻. C(2 lone pairs) Which of the following resonance structures for OCN⁻ will contribute most to the correct structure of OCN⁻? A) O(2 lone pairs) C N (2 lone pairs) B) O(1 lone pair) C-N(3 lone pairs) C) O(1 lone pair) C(2 lone pairs) N(1 lone pair) D) O(3 lone pairs) -C N(with 1 lone pair) E) They all contribute equally to the correct structure of OCN⁻. N(1 lone pair)
D) O(3 lone pairs) -C Which of the following resonance structures for OCN⁻ will contribute most to the correct structure of OCN⁻? A) O(2 lone pairs) C N (2 lone pairs) B) O(1 lone pair) C-N(3 lone pairs) C) O(1 lone pair) C(2 lone pairs) N(1 lone pair) D) O(3 lone pairs) -C N(with 1 lone pair) E) They all contribute equally to the correct structure of OCN⁻. N(with 1 lone pair)
E) They all contribute equally to the correct structure of OCN⁻.

Correct Answer

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Draw the best Lewis structure for the free radical,NO2.What is the formal charge on the N?


A) 0
B) +1
C) -1
D) +2
E) -2

Correct Answer

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Match the following.

Premises
C=N
Cs-I
Ca-O
Sr-Sr
Se-I
Responses
longest covalent bond
metallic bond
highest melting point
strongest covalent bond
weakest ionic bond

Correct Answer

C=N
Cs-I
Ca-O
Sr-Sr
Se-I

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