You may recognize that this molecule is very similar to the acetate ion, , which results upon deprotonation of acetic acid. Acetic acid is a commonly used weak acid in chemistry.

The compound name is strontium chloride because this is an ionic compound with no transition metal. Remember: ionic compounds do not have prefixes ("di," "tri," or "penta"). When assigning oxidation numbers for the atoms of this molecule, we find that strontium has a charge of  and chlorine has a charge of . Since this is a neutral molecule, two atoms of chlorine are needed to balance one atom of strontium. Since strontium is not a transition metal, it can only have a charge of , so there is no need to specify a charge in Roman numerals, which is the case for transition metal-containing compounds.

 consists of a  ion bonded to a ion, which is a perchlorate ion. Hence, the name of the ion's corresponding acid would be perchloric acid.

In this case, we have an ionic compound. Calcium  is bound ionically to the polyatomic ion, carbonate . Thus, the name of this compound is calcium carbonate.

This is an ionic compound because there is a metal (iron) bound to a nonmetal (the polyatomic ion nitrate). Iron,  is a transition metal, which means it can take on multiple different charges. To find the charge of iron in this compound we must not that the compound as a whole is neutral. Also we must know the charge on the nitrate ion, , is negative one. To balance the two nitrate ions with one iron atom, the iron must carry a positive two charge. In naming ionic compounds with transition metals, we must use Roman numerals to indicate the charge on the metal. Thus the name of this compound is iron(II) nitrate.

 is the correct answer because it takes two chloride ions to balance the positive two charge on the lead atom. lead (II) refers to the ion of lead with a  charge instead of Lead (IV) which refers to the ion with a  charge. Note that roman numerals are used with elements that can form more than one cation (generally transition metals).

For this question, you need to have the charges of polyatomic ions memorized. This will tell you that of the answer choices only the carbonate ion has a net charge of .

Chlorate: 

Nitrite: 

Phosphate: 

Carbonate: 

 and  are known as polyatomic ions. When a compound made up of polyatomic ions ionizes in water, it separates into the original polyatomic ions, not the individual elements.

Phosphoric acid combines a single phosphate ion with three hydrogen ions. The correct molecular formula is .

Sulfate is a polyatomic ion that is composed of one sulfur atom and four oxygen atoms. The ion has a net charge of .

Since sodium ions have a charge of , we must use two atoms of sodium in order to result in a neutrally charged compound.

This makes the neutral chemical compound .