Formulas and Roman Numerals in Ionic Compounds

This video tutorial introduces polyatomic ions, explaining their structure and how they differ from monatomic ions. It covers the process of writing chemical formulas for compounds containing polyatomic ions, emphasizing the importance of charge balance. The tutorial also explains when and how to use Roman numerals in naming compounds with transition metals, providing examples to illustrate these concepts.

What is the main objective of the video?

• To learn about monatomic ions

• To understand the periodic table

• To write chemical formulas and names for compounds containing polyatomic ions

• To memorize the periodic table

What is the naming convention for monatomic cations?

• Change the ending to -ide

• Use the same name as the element

• Add a prefix to the element name

• Change the ending to -ate

How do you identify a polyatomic ion from its name?

• It ends with -ide

• It starts with a capital letter

• It ends with -ite or -ate

• It has a single element name

Where can you find the list of polyatomic ions?

• In a separate chemistry book

• In the middle of the periodic table

• On the back of the periodic table

• On the front of the periodic table

What is the formula for sulfite?

• SO2 with a 3- charge

• SO3 with a 3- charge

• SO3 with a 2- charge

• SO4 with a 2- charge

When writing chemical formulas with polyatomic ions, when should you use parentheses?

• Only when there is more than one polyatomic ion

• Always

• Only when there is a single polyatomic ion

• Never

What is the formula for lithium nitrate?

• LiN

• LiN2O3

• LiNO3

• LiNO2

How do you determine the Roman numeral for a transition element?

• By looking at the periodic table

• By memorizing the charges

• By checking the charge on the anion

• By guessing

What is the charge on chromate (CrO4)?

• 2-

• 4-

• 3-

• 1-

What is the name of the compound Fe2(CrO4)3?

• Iron(V) chromate

• Iron(IV) chromate

• Iron(III) chromate

• Iron(II) chromate