Chromium and Nitrate Compounds

The video tutorial explains how to write the chemical formula for chromium(IV) nitrate. It begins by identifying the element symbols for chromium and nitrate, highlighting that nitrate is a polyatomic ion with a charge of one minus. The tutorial emphasizes the importance of balancing charges to achieve a neutral compound, leading to the final formula Cr(NO3)4. The video concludes with a brief summary of the process.

What is the element symbol for chromium?

• Cr

• Ch

• Cm

• Co

Which of the following is a polyatomic ion?

• Cl

• O2

• Nitrate

• Na

What is the ionic charge of the nitrate ion?

• 1-

• 2+

• 2-

• 1+

What does the '4' in chromium 4 nitrate indicate?

• 4- charge on nitrate

• 4+ charge on chromium

• 4 nitrate ions

• 4 atoms of chromium

How many nitrate ions are needed to balance the charge of chromium in chromium 4 nitrate?

• 2

• 3

• 4

• 5

What is the correct formula for chromium 4 nitrate?

• Cr(NO3)5

• Cr(NO3)4

• Cr(NO3)3

• Cr(NO3)2