Question 1

Which of the following best describes the difference between an atom and an ion?

Accepted Answer

An atom is electrically neutral, while an ion has an unequal number of protons and electrons.

Question 2

What is the correct formula for magnesium nitrate?

Accepted Answer

$$Mg(NO_3$)_2$$

Question 3

Which statement about ionic bonds is correct?

Accepted Answer

Ionic bonds involve the transfer of electrons from a metal to a nonmetal.

Question 4

Given the formula $$FeCl_3$$, what is the name of this compound?

Accepted Answer

Iron(III) chloride

Question 5

Which of the following ions is most important for transmitting nerve signals in the human body?

Accepted Answer

Potassium ion ($$K^+)$$

Question 6

What is the charge on the sulfide ion if it has 16 protons and 18 electrons?

Accepted Answer

$$2-$$

Question 7

Which of the following compounds is a molecular compound?

Accepted Answer

$$CO_2$$

Question 8

What is the correct Lewis structure for $$NH_3 ($$ammonia)?

Accepted Answer

A nitrogen atom in the center with three single bonds to hydrogen atoms and one lone pair on nitrogen.

Question 9

Which of the following best explains why $$H_2O is a $$polar molecule?

Accepted Answer

The molecule has a bent shape and the dipoles do not cancel.

Question 10

What is the correct name for $$N_2O_3$$?

Accepted Answer

Dinitrogen trioxide

Question 11

Which intermolecular force is strongest among the following?

Accepted Answer

Hydrogen bonding

Question 12

What is the molecular geometry of $$CO_2$$?

Accepted Answer

Linear

Question 13

Which of the following is a polyatomic ion?

Accepted Answer

$$NO_3$$^-$$

Question 14

What is the correct formula for potassium oxide?

Accepted Answer

$$K_2O$$

Question 15

Which of the following statements about electronegativity is true?

Accepted Answer

Electronegativity increases from left to right across a period.

Question 16

Which compound contains a transition metal with a variable charge?

Accepted Answer

$$Cr_2O_3$$

Question 17

What is the correct name for $$P_2O_5$$?

Accepted Answer

Diphosphorus pentoxide

Question 18

Which of the following best describes dispersion forces?

Accepted Answer

Temporary dipoles that develop in nonpolar molecules.

Question 19

Which of the following is the correct Lewis structure for $$CO_2$$?

Accepted Answer

A carbon atom in the center with two double bonds to two oxygen atoms, no lone pairs on carbon.

Question 20

Which of the following molecules is nonpolar?

Accepted Answer

$$Cl_2$$

Ionic and Molecular Compounds: Structure, Naming, and Properties

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