Question 1

Which of the following electron configurations correctly represents the ground state of phosphorus (Z = 15)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^3$$

Question 2

Which of the following elements is the most electronegative in Group 7A?

Accepted Answer

F

Question 3

According to the octet rule, how many valence electrons does oxygen have in a water molecule ($$H_2O$$)?

Accepted Answer

6 valence electrons

Question 4

What is the formal charge on the central carbon atom in the thiocyanate ion ($$SCN^-) $$given the following Lewis structure: $$N \equiv C - S^-$$?

Accepted Answer

0

Question 5

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

Accepted Answer

$$[Ne]\ 3s^2$\ 3p^5$

Question 6

Which of the following statements about resonance structures is TRUE?

Accepted Answer

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

Question 7

What is the hybridization of the central atom in $$CO_2$$?

Accepted Answer

$$sp$$

Question 8

Which of the following molecules is polar?

Accepted Answer

$$NF_3$$

Question 9

Which functional group is present in the following molecule: $$CH_3COOH$$?

Accepted Answer

Carboxylic acid

Question 10

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 11

A molecule has three electron groups and no lone pairs on the central atom. What is its electron geometry and hybridization?

Accepted Answer

Trigonal planar, $$sp^2$$

Question 12

Which of the following molecules is a hydrocarbon?

Accepted Answer

$$C_2H_6$$

Question 13

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 14

What is the formal charge on the oxygen atom in the hydronium ion ($$H_3O^+$$)?

Accepted Answer

0

Question 15

Which of the following violates Hund's Rule?

Accepted Answer

An orbital diagram where two electrons occupy the same orbital before all orbitals in a subshell are singly occupied.

Question 16

Which of the following best explains why $$CO_2 is a $$nonpolar molecule, even though it contains polar bonds?

Accepted Answer

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

Question 17

Which of the following is the correct order of increasing electronegativity?

Accepted Answer

Na \u003c Mg \u003c Al \u003c Cl

Question 18

How many unhybridized p orbitals are present on the central atom in $$HCN$$?

Accepted Answer

2

Question 19

Which of the following best describes a resonance hybrid?

Accepted Answer

A composite of all major resonance structures.

Question 20

Which of the following is the correct Lewis structure for $$COCl_2 ($$phosgene)?

Accepted Answer

Central C atom double bonded to O and single bonded to two Cl atoms, with lone pairs on O and Cl.

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

Study Guide - Practice Questions