Question 1

The molecular shape around the boron atom in BCl₃ is different than the molecular shape around the nitrogen atom in NCl₃.

Accepted Answer

The molecular shape around boron in BCl3 is trigonal planar due to its three bonding pairs and no lone pairs, while the shape around nitrogen in NCl3 is trigonal pyramidal because of its three bonding pairs and one lone pair of electrons.

Question 2

Carbon tetrachloride has ________ valence electrons.

Accepted Answer

Carbon tetrachloride (CCl4) consists of one carbon atom with 4 valence electrons and four chlorine atoms with 7 valence electrons each. Therefore, the total number of valence electrons is 4 + (4*7) = 32.

Question 3

In the Lewis structure of a molecule,oxygen atoms typically have ________ lone pair(s)of electrons.

Accepted Answer

The answer of In the Lewis structure of a molecule,oxygen...

Question 4

When writing Lewis structures,the symbol below is placed between resonance structures.

Accepted Answer

The answer of When writing Lewis structures,the symbol below is...

Question 5

The Lewis structure for the molecule below is incomplete because it is missing six pairs of nonbonding electrons.

Accepted Answer

The answer of The Lewis structure for the molecule below...

Question 6

Electronegativity ________ down a column of the periodic table as the atomic radius increases.

Accepted Answer

The answer of Electronegativity ________ down a column of the...

Question 7

What is the chemical formula for the following Lewis structure?

Accepted Answer

The answer of What is the chemical formula for the...

Question 8

In Lewis structures,fluorine atoms generally do not obey the octet rule.

Accepted Answer

Fluorine atoms always obey the octet rule in Lewis structures, as they seek to complete their valence shell with a total of 8 electrons.

Question 9

In general,a ________ bond will be one in which the electronegativity difference between two atoms is 0.5 units or greater.

Accepted Answer

The answer of In general,a ________ bond will be one...

Question 10

Dibromomethane (CH₂Br₂)is a nonpolar molecule.

Accepted Answer

Dibromomethane (CH2Br2) has a polar bond due to the difference in electronegativity between carbon and bromine, but its symmetrical shape can lead to confusion. However, the overall molecular polarity depends on the arrangement of these bonds, and in the case of CH2Br2, slight asymmetry in the three-dimensional arrangement can lead to a net dipole moment, making the molecule polar.

Question 11

Double bonds and triple bonds are never polar bonds.

Accepted Answer

Double and triple bonds can be polar if there is a difference in electronegativity between the two atoms forming the bond.

Question 12

A N-O bond is more polar than a P-O bond.

Accepted Answer

The answer of A N-O bond is more polar than...

Question 13

The shape around each carbon atom in the molecule below is trigonal planar.

Accepted Answer

The answer of The shape around each carbon atom in...

Question 14

The shapes around the left and right carbon atoms in the structure below are tetrahedral and linear,respectively.

Accepted Answer

The answer of The shapes around the left and right...

Question 15

The molecule below is a polar molecule.

Accepted Answer

The answer of The molecule below is a polar molecule....

Question 16

The chemical formula for phosphorus pentachloride is ________.

Accepted Answer

The answer of The chemical formula for phosphorus pentachloride is...

Question 17

To represent the three-dimensional geometry of a tetrahedron on a two-dimensional piece of paper,a solid line is used for the two bonds in the plane of the paper; a ________ is used to show a bond that extends in front of the plane; and a ________ is used to show a bond that extends behind the plane.

Accepted Answer

The answer of To represent the three-dimensional geometry of a...

Question 18

A double bond is counted as two groups in the valence shell electron pair repulsion (VSEPR)theory.

Accepted Answer

In VSEPR theory, a double bond is treated as a single electron group or domain, not as two separate groups.

Question 19

The molecule below is a polar molecule.

Accepted Answer

The answer of The molecule below is a polar molecule....

Question 20

Aspartic acid is an amino acid used to synthesize proteins. There are ________ atoms with a trigonal planar geometry in the aspartic acid structure shown here.

Accepted Answer

The answer of Aspartic acid is an amino acid used...

Quiz 4: Covalent Compounds

The molecular shape around the boron atom in BCl₃ is different than the molecular shape around the nitrogen atom in NCl₃.

Carbon tetrachloride has ________ valence electrons.

In the Lewis structure of a molecule,oxygen atoms typically have ________ lone pair(s)of electrons.

When writing Lewis structures,the symbol below is placed between resonance structures.

The Lewis structure for the molecule below is incomplete because it is missing six pairs of nonbonding electrons.

Electronegativity ________ down a column of the periodic table as the atomic radius increases.

What is the chemical formula for the following Lewis structure?

In Lewis structures,fluorine atoms generally do not obey the octet rule.

In general,a ________ bond will be one in which the electronegativity difference between two atoms is 0.5 units or greater.

Dibromomethane (CH₂Br₂)is a nonpolar molecule.

Double bonds and triple bonds are never polar bonds.

A N-O bond is more polar than a P-O bond.

The shape around each carbon atom in the molecule below is trigonal planar.

The shapes around the left and right carbon atoms in the structure below are tetrahedral and linear,respectively.

The molecule below is a polar molecule.

The chemical formula for phosphorus pentachloride is ________.

To represent the three-dimensional geometry of a tetrahedron on a two-dimensional piece of paper,a solid line is used for the two bonds in the plane of the paper; a is used to show a bond that extends in front of the plane; and a is used to show a bond that extends behind the plane.

A double bond is counted as two groups in the valence shell electron pair repulsion (VSEPR)theory.

The molecule below is a polar molecule.

Aspartic acid is an amino acid used to synthesize proteins. There are ________ atoms with a trigonal planar geometry in the aspartic acid structure shown here.

Quiz 4: Covalent Compounds

The molecular shape around the boron atom in BCl3 is different than the molecular shape around the nitrogen atom in NCl3.

Carbon tetrachloride has ________ valence electrons.

In the Lewis structure of a molecule,oxygen atoms typically have ________ lone pair(s)of electrons.

When writing Lewis structures,the symbol below is placed between resonance structures.

The Lewis structure for the molecule below is incomplete because it is missing six pairs of nonbonding electrons.

Electronegativity ________ down a column of the periodic table as the atomic radius increases.

What is the chemical formula for the following Lewis structure?

In Lewis structures,fluorine atoms generally do not obey the octet rule.

In general,a ________ bond will be one in which the electronegativity difference between two atoms is 0.5 units or greater.

Dibromomethane (CH2Br2)is a nonpolar molecule.

Double bonds and triple bonds are never polar bonds.

A N-O bond is more polar than a P-O bond.

The shape around each carbon atom in the molecule below is trigonal planar.

The shapes around the left and right carbon atoms in the structure below are tetrahedral and linear,respectively.

The molecule below is a polar molecule.

The chemical formula for phosphorus pentachloride is ________.

A double bond is counted as two groups in the valence shell electron pair repulsion (VSEPR)theory.

The molecule below is a polar molecule.

Aspartic acid is an amino acid used to synthesize proteins. There are ________ atoms with a trigonal planar geometry in the aspartic acid structure shown here.

The molecular shape around the boron atom in BCl₃ is different than the molecular shape around the nitrogen atom in NCl₃.

Dibromomethane (CH₂Br₂)is a nonpolar molecule.