Polyatomic Ions and Their Formulas

The video tutorial provides a comprehensive review of polyatomic ions, focusing on their formulas and charges. It covers common ions like phosphate, sulfate, nitrate, and carbonate, and explains the differences in oxygen content among similar ions. The tutorial emphasizes the importance of learning these ions for formula writing and categorizes them based on their central atoms. It also discusses the oxyanions of halogens, highlighting the similarities across different elements. The video concludes by stressing the significance of understanding these ions for successful chemical formula writing.

Which of the following is the formula for the sulfate ion?

• SO3 2-

• CO3 2-

• NO3 -

• SO4 2-

What is the charge on the ammonium ion?

• 2-

• 1-

• 2+

• 1+

Which ion has one less oxygen atom than sulfate?

• Carbonate

• Sulfite

• Nitrate

• Phosphate

What is the formula for the nitrite ion?

• N3 -

• NH4 +

• NO2 -

• NO3 -

Why is it important to learn the formulas and charges of polyatomic ions?

• To balance chemical equations

• To predict reaction rates

• To write chemical formulas accurately

• To identify covalent compounds

Which of the following is a phosphorus-containing polyatomic ion?

• Phosphate

• Sulfate

• Nitrate

• Chlorate

Which ion is the only common positive polyatomic ion?

• Hydroxide

• Ammonium

• Nitrate

• Carbonate

What is the formula for the hypochlorite ion?

• ClO2 -

• ClO3 -

• ClO4 -

• ClO -

Which of the following is an oxyanion of chlorine with one more oxygen than chlorate?

• Hypochlorite

• Chloride

• Chlorite

• Perchlorate

What is the similarity between the oxyanions of chlorine, bromine, and iodine?

• They all form acids

• They all have similar naming conventions

• They all have the same number of oxygen atoms

• They all have the same charge