Question 1

Which of the following statements best describes the Aufbau Principle in electron configuration?

Accepted Answer

Electrons fill orbitals in order of increasing energy, starting from the lowest energy orbital.

Question 2

What is the condensed electron configuration for phosphorus (Z = 15)?

Accepted Answer

Ne[3s23p3]

Question 3

Which element is the most electronegative in Group 7A?

Accepted Answer

Fluorine

Question 4

According to the octet rule, how many valence electrons does oxygen have in a water molecule (H₂O)?

Accepted Answer

6

Question 5

What is the formal charge on the central carbon atom in the thiocyanate ion (SCN-) if the Lewis structure is N=C=S?

Accepted Answer

0

Question 6

When drawing Lewis dot structures, which element is never placed in the center of the molecule?

Accepted Answer

Hydrogen

Question 7

Which of the following molecules exhibits resonance?

Accepted Answer

Nitrate ion (NO3-)

Question 8

What is the hybridization of the central atom in carbon dioxide (CO2)?

Accepted Answer

sp

Question 9

Which of the following molecules is polar?

Accepted Answer

Ammonia (NH3)

Question 10

Which functional group is present in the following structure: CH_{3}-COOH?

Accepted Answer

Carboxylic acid

Question 11

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same atomic number but different mass numbers.

Question 12

A hydrogen atom loses its only electron. What is the resulting species called?

Accepted Answer

Proton

Question 13

Which principle is violated if two electrons in the same orbital have the same spin?

Accepted Answer

Pauli Exclusion Principle

Question 14

How many unhybridized p orbitals are present on the central atom in ethene (C2H4)?

Accepted Answer

1

Question 15

Which of the following best describes a resonance hybrid?

Accepted Answer

A composite of all major resonance structures, representing the true structure.

Question 16

Which of the following molecules is both organic and a hydrocarbon?

Accepted Answer

CH4

Question 17

Which of the following best explains why fluorine is more electronegative than chlorine?

Accepted Answer

Fluorine has a smaller atomic radius and a greater effective nuclear charge.

Question 18

What is the molecular geometry and polarity of nitrogen trifluoride (NF3)?

Accepted Answer

Trigonal pyramidal, polar

Question 19

Which of the following is the correct formal charge calculation for oxygen in water (H2O)?

Accepted Answer

6-(4+2)=0

Question 20

Which of the following best describes a nonpolar molecule?

Accepted Answer

A molecule with polar bonds and a perfect shape that cancels dipoles.

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

Study Guide - Practice Questions