$$1 \times (2^+) + 2 \times (1^-) = 0$$

$$2 \times (1^+) + 1 \times (2^-) = 0$$

$$1 \times (3^+) + 3 \times (1^-) = 0$$

Question 1

Which of the following best describes an ionic compound?

Accepted Answer

A compound consisting of positive and negative ions held together by strong electrical attractions.

Question 2

What is the correct formula for the ionic compound formed between magnesium and chlorine?

Accepted Answer

$$\mathrm{$$MgCl_2$$}$$

Question 3

Which property is NOT characteristic of ionic compounds?

Accepted Answer

They are gases at room temperature.

Question 4

A sodium atom reacts with a chlorine atom to form sodium chloride. What happens to the size of each atom after the reaction?

Accepted Answer

The sodium atom shrinks and the chlorine atom increases in size.

Question 5

Which of the following correctly represents the charge balance in the formation of magnesium chloride?

Accepted Answer

$$1 	imes (2^+) + 2 	imes (1^-) = 0$$

Question 6

What is the correct formula for the ionic compound formed between aluminum and chlorine?

Accepted Answer

$$\mathrm{$$AlCl_3$$}$$

Question 7

Which of the following statements about the chemical formula of an ionic compound is TRUE?

Accepted Answer

The sum of the ionic charges in the formula equals zero.

Question 8

A compound is formed from two sodium atoms and one sulfur atom. What is the formula of this compound?

Accepted Answer

$$\mathrm{Na_2S}$$

Question 9

Which of the following best explains why ionic compounds have high melting points?

Accepted Answer

Strong electrical attractions between oppositely charged ions require a lot of energy to break.

Question 10

Which of the following is the correct formula for the ionic compound formed between magnesium and nitrogen?

Accepted Answer

$$\mathrm{Mg_3N_2}$$

Question 11

A patient is given a medication containing sodium chloride. Which of the following best describes the bonding in sodium chloride?

Accepted Answer

Ionic bonds between $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$ ions.

Question 12

Which of the following formulas represents a compound where the total positive charge equals the total negative charge?

Accepted Answer

$$2 	imes (1^+) + 1 	imes (2^-) = 0$$

Question 13

If a compound is formed from $$\mathrm{Al$$^{3+}$$}$$ and $$\mathrm{Cl^-}$$ ions, what is the correct charge balance equation?

Accepted Answer

$$1 	imes (3^+) + 3 	imes (1^-) = 0$$

Question 14

Which of the following is a real-world example of an ionic compound used in medicine?

Accepted Answer

Sodium chloride as an intravenous saline solution.

Question 15

A student writes the formula for the compound formed between sodium and oxygen as $$\mathrm{NaO}. $$What is the correct formula and why?

Accepted Answer

$$\mathrm{Na_2O}$$, because two $$\mathrm{Na^+}$$ ions are needed to balance one $$\mathrm{O$$^{2-}$$}$$ ion.

Question 16

Which of the following best describes the process of forming an ionic bond between magnesium and chlorine?

Accepted Answer

Magnesium loses two electrons, each chlorine gains one electron, forming $$\mathrm{Mg$$^{2+}$$}$$ and two $$\mathrm{Cl^-}$$ ions.

Question 17

Which of the following is the correct formula for the ionic compound formed between sodium and sulfur?

Accepted Answer

$$\mathrm{Na_2S}$$

Question 18

A chemist needs to prepare a sample of magnesium nitride. What is the correct formula for this compound, and what is the charge balance?

Accepted Answer

$$\mathrm{Mg_3N_2}$$; $$3 	imes (2^+) + 2 	imes (3^-) = 0$$

Ionic Compounds: Structure, Properties, and Formula Writing

Study Guide - Practice Questions