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, which statement is true for the oxygen atom in methanol (CH$$_3OH$$)?

Accepted Answer

Oxygen possesses 8 octet electrons: 6 valence and 2 shared electrons.

Question 4

What is the formal charge on the nitrogen atom in the thiocyanate ion (NCS$$^-$$)? (N is in Group 5A)

Accepted Answer

$$0$$

Question 5

When drawing the Lewis structure for CCl$$_4$$, which atom should be placed at the center?

Accepted Answer

Carbon, because it is less electronegative than chlorine.

Question 6

Which of the following statements about resonance structures is correct?

Accepted Answer

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

Question 7

What is the hybridization of the central atom in HCN?

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 compound: CH$$_3$$COOH?

Accepted Answer

Carboxylic acid

Question 10

Which of the following best describes the periodic trend for electronegativity?

Accepted Answer

Increases from left to right across a period and increases going up a group.

Question 11

How many unhybridized p orbitals are present on the central atom in a molecule with sp$$^2$$ hybridization?

Accepted Answer

1

Question 12

Which of the following molecules has a perfect (nonpolar) shape according to VSEPR theory?

Accepted Answer

CCl$$_4$$

Question 13

What is the formal charge on the central carbon atom in COCl$$_2 ($$phosgene)?

Accepted Answer

0

Question 14

Which of the following is a correct statement about the octet rule?

Accepted Answer

Most main group elements tend to achieve 8 valence electrons through bonding.

Question 15

Which of the following is NOT a valid resonance structure for the nitrate ion, NO$$_3^-$$?

Accepted Answer

A structure with all three N–O bonds as single bonds and extra lone pairs on nitrogen.

Question 16

Which of the following best describes the hybridization and geometry of the central atom in methane (CH$$_4$$)?

Accepted Answer

sp$$^3$$ hybridization, tetrahedral geometry

Question 17

Which of the following functional groups contains a carbonyl group directly bonded to a nitrogen atom?

Accepted Answer

Amide

Question 18

A molecule has three electron groups and one lone pair on the central atom. What is its molecular geometry?

Accepted Answer

Bent

Question 19

Which of the following statements about formal charge is correct?

Accepted Answer

The sum of the formal charges in a neutral molecule must be zero.

Question 20

Which of the following molecules is expected to have the highest dipole moment?

Accepted Answer

H$$_2O$$

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

Study Guide - Practice Questions