Barium and Cyanide Ion Chemistry

The video tutorial explains how to write the chemical formula for barium cyanide. It begins by identifying the element symbol for barium and the cyanide ion, which is a polyatomic ion with the formula CN-. The tutorial emphasizes the importance of balancing the charges to achieve a neutral compound. Barium, being in group two of the periodic table, has a 2+ charge, while the cyanide ion has a 1- charge. To balance the charges, two cyanide ions are needed for each barium ion, resulting in the formula Ba(CN)2. The video concludes with a summary of the steps involved in deriving the formula.

What is the chemical symbol for barium?

• Be

• Br

• B

• Ba

Which of the following is the correct formula for the cyanide ion?

• C2N

• C2N-

• CN-

• CN+

What is the charge of a barium ion?

• 1+

• 2+

• 2-

• 1-

How many cyanide ions are needed to balance the charge of one barium ion?

• One

• Four

• Two

• Three

What does the subscript '2' in Ba(CN)2 indicate?

• Two charges

• Two molecules of barium cyanide

• Two barium ions

• Two cyanide ions