Question 1

Which of the following statements best explains why isotopes of the same element have nearly identical chemical properties?

Accepted Answer

Isotopes have the same number of protons and electrons, so their electron configurations and chemical behavior are the same.

Question 2

A neutral atom of phosphorus (Z = 15) has which of the following ground state electron configurations?

Accepted Answer

1s2 2s2 2p6 3s2 3p3

Question 3

Which of the following elements is expected to have the highest electronegativity?

Accepted Answer

Fluorine

Question 4

A carbon atom in methane (CH4) forms four single bonds with hydrogen. What is the hybridization of the carbon atom, and what is the molecular geometry?

Accepted Answer

sp3 hybridization; tetrahedral geometry

Question 5

Which of the following molecules is polar due to its molecular geometry and the presence of a lone pair on the central atom?

Accepted Answer

NF3

Question 6

A student draws the following electron configuration for nitrogen: 1s2 2s2 2p4. Which principle is violated in this configuration?

Accepted Answer

Hund's Rule

Question 7

Which of the following best describes the difference between a hydrocarbon and an organic molecule?

Accepted Answer

A hydrocarbon contains only carbon and hydrogen, while an organic molecule contains carbon and hydrogen but may also contain other elements.

Question 8

Which of the following is the correct formal charge on the nitrogen atom in the thiocyanate ion (NCS–), given that nitrogen has 5 valence electrons, 2 nonbonding electrons, and is involved in 3 bonds?

Accepted Answer

0

Question 9

Which of the following molecules has resonance structures?

Accepted Answer

NO3–

Question 10

Which of the following best explains why BeCl2 is linear in shape?

Accepted Answer

It has two electron groups around the central atom, resulting in sp hybridization and a linear geometry.

Question 11

Which of the following statements about the octet rule is correct?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve eight electrons in their valence shell.

Question 12

Which of the following functional groups is present in acetic acid (CH3COOH)?

Accepted Answer

Carboxylic acid

Question 13

A molecule has three electron groups around the central atom and no lone pairs. What is its expected geometry and polarity?

Accepted Answer

Trigonal planar; nonpolar

Question 14

Which of the following best describes the Pauli Exclusion Principle?

Accepted Answer

No two electrons in the same atom can have the same set of four quantum numbers.

Question 15

Which of the following is a correct condensed electron configuration for chlorine (Z = 17)?

Accepted Answer

[Ne] 3s2 3p5

Question 16

Which of the following best explains why CO2 is a nonpolar molecule, even though it contains polar bonds?

Accepted Answer

The molecule is linear and symmetrical, so the bond dipoles cancel each other out.

Question 17

Which of the following statements about resonance structures is correct?

Accepted Answer

Resonance structures differ only in the placement of electrons, not the arrangement of atoms.

Question 18

Which of the following is the correct number of valence electrons for oxygen in methanol (CH3OH)?

Accepted Answer

6

Question 19

Which of the following best describes the electron configuration of a sodium ion (Na+)?

Accepted Answer

Same as neon (1s2 2s2 2p6)

Question 20

Which of the following molecules contains a carbon atom with sp hybridization?

Accepted Answer

HCN

General Chemistry Study Notes: Atomic Structure, Bonding, and Molecular Properties

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