Understanding Chromium Nitrate Compounds

The video tutorial explains how to write the formula for chromium 3 nitrate. It begins by identifying the element symbols and understanding the charges of ions involved. The tutorial introduces the crisscross method to balance the charges in a neutral compound, ensuring the net charge is zero. Finally, the video verifies the formula and concludes the explanation.

What is the symbol for chromium on the periodic table?

• Cr

• Cm

• Ch

• Co

What does the Roman numeral in chromium 3 nitrate indicate?

• The number of electrons

• The charge of chromium

• The atomic number of chromium

• The number of nitrate ions

What is the charge of the nitrate ion?

• 2-

• 1+

• 1-

• 3+

How can you find the charge of the nitrate ion if you don't memorize it?

• By guessing

• By looking it up on a table

• By asking a friend

• By using a calculator

Why must the charges in a compound add up to zero?

• To make it stable

• To make it an ion

• To make it neutral

• To make it reactive

What method is used to balance the charges in chromium 3 nitrate?

• Cross-multiplication

• Addition method

• Crisscross method

• Substitution method

How many nitrate ions are needed in the formula for chromium 3 nitrate?

• Two

• One

• Three

• Four

What is the net charge of the chromium 3 nitrate compound?

• 1+

• 0

• 3-

• 2+