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

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