Cadmium Nitrate and Nitrate Ions

The video tutorial explains how to write the chemical formula for cadmium nitrate. It begins by identifying cadmium as a transition metal and nitrate as a polyatomic ion. The tutorial discusses the charges of these ions, noting that cadmium typically has a 2+ charge, while nitrate has a 1- charge. To balance the charges, two nitrate ions are needed for each cadmium ion, resulting in the formula Cd(NO3)2. The video also covers naming conventions, mentioning that cadmium is often written without a Roman numeral due to its consistent charge. The tutorial concludes with a summary of the key points.

What is the element symbol for cadmium?

• Cm

• Cd

• Ca

• Cn

Which of the following is a polyatomic ion?

• O2

• NO3-

• H2O

• Cl-

What is the charge of the nitrate ion?

• 2-

• 2+

• 1-

• 1+

Why do we need two nitrate ions to balance cadmium in cadmium nitrate?

• Because cadmium is 1+

• Because nitrate is 2+

• Because cadmium is 2+

• Because nitrate is 1+

What is the correct formula for cadmium nitrate?

• CdNO3

• Cd(NO3)2

• Cd(NO3)3

• Cd2(NO3)3

What does the subscript '2' in Cd(NO3)2 indicate?

• Two cadmium atoms

• Two oxygen atoms

• Two nitrate ions

• Two nitrogen atoms

What is the role of parentheses in the formula Cd(NO3)2?

• To indicate a single ion

• To show the charge of cadmium

• To group the nitrate ions

• To separate cadmium from nitrate

Why might a Roman numeral be used in the name of cadmium nitrate?

• To indicate the number of nitrate ions

• To show the charge of cadmium

• To specify the number of cadmium atoms

• To denote the number of oxygen atoms

Why is the Roman numeral often omitted in the name of cadmium nitrate?

• Cadmium is almost always 2+

• Cadmium is always 3+

• Cadmium is a nonmetal

• Cadmium is always 1+