Question 1

What is the correct name for the compound with the formula $$\mathrm{$$MgSO_4$$}$$?

Accepted Answer

Magnesium sulfate

Question 2

Which of the following is the correct formula for potassium perchlorate?

Accepted Answer

$$\mathrm{$$KClO_4$$}$$

Question 3

What is the correct formula for the compound formed from $$\mathrm{Na^+}$$ and $$\mathrm{NO_3$^-}$$ ions?

Accepted Answer

$$\mathrm{$$NaNO_3$$}$$

Question 4

Which of the following names is INCORRECT, and what is the correct name for the compound formed from $$\mathrm{S}$$ and $$\mathrm{Mg}$$?

Accepted Answer

Sulfur magneside is incorrect; the correct name is magnesium sulfide.

Question 5

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

Accepted Answer

$$\mathrm{K_2SO_4}$$

Question 6

Which of the following is the correct name for $$\mathrm{(NH_4$)_2CO_3}$$?

Accepted Answer

Ammonium carbonate

Question 7

A student writes the formula $$\mathrm{Na_2SO_4}$$ for sodium sulfate. What is the charge on the sulfate ion, and why is this formula correct?

Accepted Answer

Sulfate has a $$2-$$ charge, so two $$\mathrm{Na^+}$$ ions are needed to balance the charge, making $$\mathrm{Na_2SO_4}$$ correct.

Question 8

Which of the following is the correct formula for the compound formed from $$\mathrm{Sr$$^{2+}$$}$$ and $$\mathrm{Cl^-}$$ ions?

Accepted Answer

$$\mathrm{$$SrCl_2$$}$$

Question 9

Which of the following is the correct name for $$\mathrm{$$KMnO_4$$}$$, a compound used as a disinfectant and in water treatment?

Accepted Answer

Potassium permanganate

Question 10

A student writes the name 'Calcium (II) oxide' for $$\mathrm{CaO}. $$What is wrong with this name?

Accepted Answer

Calcium only forms a $$2+$$ ion, so the Roman numeral is unnecessary; the correct name is calcium oxide.

Question 11

What is the correct formula for aluminum hydride?

Accepted Answer

$$\mathrm{$$AlH_3$$}$$

Question 12

Which of the following is the correct name for $$\mathrm{$$ZnCrO_4$$}$$?

Accepted Answer

Zinc chromate

Question 13

A student writes 'Sodium nitrite' for a compound of sodium and nitrogen. What is wrong with this name?

Accepted Answer

Sodium nitrite contains the $$\mathrm{NO_2$^-}$$ ion, not just nitrogen; the correct name for $$\mathrm{Na_3N} is $$sodium nitride.

Question 14

What is the correct formula for the compound formed from $$\mathrm{Ba$$^{2+}$$}$$ and $$\mathrm{PO_4$^{3-}}$$ ions?

Accepted Answer

$$\mathrm{Ba_3$(PO_4$)_2}$$

Question 15

Which of the following is the correct name for $$\mathrm{Ca_3$(PO_4$)_2}$$, a compound found in bones and teeth?

Accepted Answer

Calcium phosphate

Question 16

Which of the following is the correct formula for tin(II) bromide?

Accepted Answer

$$\mathrm{$$SnBr_2$$}$$

Question 17

A student writes 'Tin bromide' for $$\mathrm{$$SnBr_2$$}. $$What is wrong with this name?

Accepted Answer

Tin can have multiple oxidation states; the correct name is tin(II) bromide.

Question 18

Which of the following is the correct formula for barium chloride?

Accepted Answer

$$\mathrm{$$BaCl_2$$}$$

Question 19

A student writes the formula $$\mathrm{SrS}$$ for a compound of strontium and sulfate. What is wrong with this formula?

Accepted Answer

Sulfate is $$\mathrm{SO_4$^{2-}}$$, not $$\mathrm{S$$^{2-}$$}$$; the correct formula is $$\mathrm{$$SrSO_4$$}.$$

Question 20

Which of the following is the correct formula for potassium chloride?

Accepted Answer

$$\mathrm{KCl}$$

General Chemistry Practice: Naming and Writing Formulas for Ionic Compounds

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