Question 1

Which of the following best explains why sodium chloride (NaCl) is a solid with a high melting point at room temperature?
Correct answer: It is held together by strong electrostatic attraction between oppositely charged ions.

Accepted Answer

It is held together by strong electrostatic attraction between oppositely charged ions.

Question 2

Which element would you expect to have the highest electronegativity?
Correct answer: Fluorine (F)

Accepted Answer

Fluorine (F)

Question 3

A molecule of carbon dioxide (CO₂) is nonpolar, even though it contains polar bonds. Which statement best explains this observation?
Correct answer: The molecule has a linear geometry, causing the bond dipoles to cancel each other out.

Accepted Answer

The molecule has a linear geometry, causing the bond dipoles to cancel each other out.

Question 4

Which of the following Lewis dot symbols correctly represents the chloride ion (Cl⁻)?
Correct answer: Cl with eight dots enclosed in brackets and a negative sign

Accepted Answer

Cl with eight dots enclosed in brackets and a negative sign

Question 5

Which of the following molecules contains a polar covalent bond but is overall nonpolar?
Correct answer: Carbon dioxide (CO₂)

Accepted Answer

Carbon dioxide (CO₂)

Question 6

A student draws the Lewis structure for the nitrate ion (NO₃⁻) and calculates the formal charge on each oxygen atom. Which formula should the student use?
Correct answer: Formal Charge = Valence Electrons − (Nonbonding Electrons + Bonds)

Accepted Answer

Formal Charge = Valence Electrons − (Nonbonding Electrons + Bonds)

Question 7

Which of the following best describes metallic bonding in copper (Cu)?
Correct answer: Copper atoms are surrounded by a sea of delocalized electrons that move freely.

Accepted Answer

Copper atoms are surrounded by a sea of delocalized electrons that move freely.

Question 8

Which of the following statements about the octet rule is correct?
Correct answer: Main group elements tend to achieve eight valence electrons, but some can have incomplete or expanded octets.

Accepted Answer

Main group elements tend to achieve eight valence electrons, but some can have incomplete or expanded octets.

Question 9

Which of the following pairs of atoms would form a bond with the greatest ionic character?
Correct answer: Sodium (Na) and Chlorine (Cl)

Accepted Answer

Sodium (Na) and Chlorine (Cl)

Question 10

A molecule has a central atom with two single bonds and two lone pairs. Which of the following best describes the electron arrangement and bond polarity?
Correct answer: Tetrahedral electron arrangement; polar molecule if the bonds are polar

Accepted Answer

Tetrahedral electron arrangement; polar molecule if the bonds are polar

Question 11

Which of the following best explains why metals are good conductors of electricity?
Correct answer: They have loosely held valence electrons that can move freely throughout the structure.

Accepted Answer

They have loosely held valence electrons that can move freely throughout the structure.

Question 12

Which of the following is the correct Lewis dot symbol for a magnesium ion (Mg²⁺)?
Correct answer: Mg with no dots and a 2+ sign

Accepted Answer

Mg with no dots and a 2+ sign

Question 13

Which of the following scenarios would most likely result in a molecule with an expanded octet?
Correct answer: Sulfur hexafluoride (SF₆)

Accepted Answer

Sulfur hexafluoride (SF₆)

Question 14

A patient is given a medication that contains calcium ions (Ca²⁺). How many valence electrons are shown in the Lewis dot symbol for Ca²⁺?
Correct answer: Zero

Accepted Answer

Zero

Question 15

Which of the following best describes the difference between shared and unshared electrons in a Lewis structure?
Correct answer: Shared electrons are involved in bonds, while unshared electrons are lone pairs not involved in bonding.

Accepted Answer

Shared electrons are involved in bonds, while unshared electrons are lone pairs not involved in bonding.

Question 16

Which of the following molecules would you expect to have the largest dipole moment?
Correct answer: Hydrogen fluoride (HF)

Accepted Answer

Hydrogen fluoride (HF)

Question 17

A student is asked to determine the formal charge on the central atom in the Lewis structure of ozone (O₃). Which step should the student perform first?
Correct answer: Count the number of valence electrons for the central atom.

Accepted Answer

Count the number of valence electrons for the central atom.

Question 18

Which of the following best describes the bond in a molecule of hydrogen chloride (HCl)?
Correct answer: Polar covalent bond

Accepted Answer

Polar covalent bond

Question 19

Which of the following is a correct application of the octet rule in a real-world context?
Correct answer: Oxygen atoms in water (H₂O) form two bonds to achieve a stable octet.

Accepted Answer

Oxygen atoms in water (H₂O) form two bonds to achieve a stable octet.

Question 20

Which of the following best explains why the bond between two nitrogen atoms in N₂ is nonpolar?
Correct answer: Both atoms have the same electronegativity, so electrons are shared equally.

Accepted Answer

Both atoms have the same electronegativity, so electrons are shared equally.

Karina File 2

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