Question 1

Which of the following best describes a formula unit in the context of ionic compounds?

Accepted Answer

The smallest repeating unit of an ionic solid that contains a neutral charge.

Question 2

What is the correct formula for the compound formed between $\mathrm{Mg^{2+}}$ and $\mathrm{SO_4^{2-}}$?

Accepted Answer

$\mathrm{MgSO_4}$

Question 3

When writing the formula for an ionic compound, what is the purpose of crossing the charges?

Accepted Answer

To determine the ratio of ions needed to achieve electrical neutrality.

Question 4

Given the ions $\mathrm{Al^{3+}}$ and $\mathrm{N^{3-}}$, what is the correct formula for the resulting compound?

Accepted Answer

$\mathrm{AlN}$

Question 5

Which of the following best explains why ionic compounds form crystal lattices?

Accepted Answer

Ions arrange in a repeating pattern to maximize attractive forces and minimize repulsive forces.

Question 6

What is the correct formula for sodium dichromate, given the ions $\mathrm{Na^+}$ and $\mathrm{Cr_2O_7^{2-}}$?

Accepted Answer

$\mathrm{Na_2Cr_2O_7}$

Question 7

A student is asked to write the formula for barium phosphate. Given $\mathrm{Ba^{2+}}$ and $\mathrm{PO_4^{3-}}$, which formula is correct?

Accepted Answer

$\mathrm{Ba_3(PO_4)_2}$

Question 8

Which of the following is a correct step when writing the formula for an ionic compound?

Accepted Answer

Write the ions involved in the compound with their charges.

Question 9

If a compound is formed from $\mathrm{Ca^{2+}}$ and $\mathrm{Cl^-}$, what is its correct chemical formula?

Accepted Answer

$\mathrm{CaCl_2}$

Question 10

Why is the formula for sodium chloride written as $\mathrm{NaCl}$ and not $\mathrm{Na_2Cl_2}$?

Accepted Answer

Because the charges of $\mathrm{Na^+}$ and $\mathrm{Cl^-}$ balance in a 1:1 ratio.

Question 11

Which of the following compounds is correctly matched with its ions?

Accepted Answer

$\mathrm{K_2SO_4}$: $\mathrm{K^+}$ and $\mathrm{SO_4^{2-}}$

Question 12

A hospital uses aluminum nitride in a medical device. What is the correct formula for aluminum nitride, given $\mathrm{Al^{3+}}$ and $\mathrm{N^{3-}}$?

Accepted Answer

$\mathrm{AlN}$

Question 13

Which of the following best describes the process of forming an ionic compound from its ions?

Accepted Answer

Ions combine in ratios that result in a net charge of zero.

Question 14

If $\mathrm{Fe^{3+}}$ combines with $\mathrm{O^{2-}}$, what is the correct formula for the resulting compound?

Accepted Answer

$\mathrm{Fe_2O_3}$

Question 15

Which of the following is a real-world application of understanding ionic compound formulas?

Accepted Answer

Determining the correct dosage of a medication containing ionic salts.

Writing Formula Units of Ionic Compounds

Study Guide - Practice Questions

Study Guide - Flashcards