Question 1

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

Accepted Answer

Ne10 3s2 3p3

Question 2

Which element below is the most electronegative in Group 7A?

Accepted Answer

Cl

Question 3

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

Accepted Answer

8 octet electrons, 2 shared electrons

Question 4

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 5

Which of the following is a correct step when drawing the Lewis Dot Structure for CO2?

Accepted Answer

Place the least electronegative atom (carbon) in the center

Question 6

Which statement about resonance structures is TRUE for the nitrate ion (NO3^-)?

Accepted Answer

The real structure is a resonance hybrid of all resonance forms

Question 7

What is the hybridization of the central atom in HCN?

Accepted Answer

sp1

Question 8

Which of the following molecules is polar?

Accepted Answer

NH3

Question 9

Which functional group is present in the following molecule: $$CH_3-$$COOH?

Accepted Answer

Carboxylic acid

Question 10

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same atomic number but different mass numbers

Question 11

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

Accepted Answer

Pauli Exclusion Principle

Question 12

What is the correct condensed electron configuration for chlorine (Z=17)?

Accepted Answer

Ne10 3s2 3p5

Question 13

Which of the following best describes a resonance hybrid?

Accepted Answer

A composite of all major resonance structures

Question 14

Which of the following molecules is a hydrocarbon?

Accepted Answer

$$CH_4$$

Question 15

Which of the following best explains why CO2 is a nonpolar molecule?

Accepted Answer

It has polar bonds but a linear, symmetric shape

Question 16

How many electron groups are around the central atom in BF3 and what is its hybridization?

Accepted Answer

3 electron groups, sp2

Question 17

Which of the following is the correct formal charge calculation for oxygen in the nitrate ion (NO3^-) if it has one single bond and three lone pairs?

Accepted Answer

6-(2+6)=-2

Question 18

Which of the following best describes a nonpolar molecule?

Accepted Answer

A molecule with a perfect shape and no lone pairs on the central atom

Question 19

Which of the following is a correct statement about the periodic trend of electronegativity?

Accepted Answer

Electronegativity increases from left to right across a period and up a group

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

Study Guide - Practice Questions