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 emphasizes the importance of understanding ionic charges, 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 for transition metal compounds, mentioning that cadmium's charge is often implied and not always explicitly stated with a Roman numeral.

What is the element symbol for cadmium?

• Ca

• Cd

• Cm

• Cn

Which of the following is a polyatomic ion?

• Cl-

• H2O

• O2

• NO3-

What is the charge of the nitrate ion?

• 1+

• 2-

• 1-

• 2+

How many nitrate ions are needed to balance one cadmium ion?

• One

• Four

• Two

• Three

What is the correct formula for cadmium nitrate?

• Cd(NO3)2

• CdNO3

• Cd(NO3)3

• Cd2(NO3)3

Why are parentheses used in the formula for cadmium nitrate?

• To group the nitrate ions

• To balance the equation

• To indicate a single ion

• To show the charge of cadmium

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

• Two cadmium ions

• Two nitrate ions

• Two charges

• Two molecules

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

• To denote the state of matter

• To specify the number of atoms

• To show the charge of cadmium

• To indicate the number of nitrate ions

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

• Cadmium does not form ions

• Cadmium is almost always 2+

• Cadmium always has a 1+ charge

• Cadmium is not a transition metal