Potassium Cyanide and Ionic Charges

The video tutorial explains how to write the chemical formula for potassium cyanide. It begins by identifying the symbols for potassium and cyanide, noting that cyanide is a polyatomic ion with a 1- charge. The tutorial emphasizes that potassium, being in group one, has a 1+ charge. It explains that in a neutral compound like potassium cyanide, the charges must balance to zero. The video concludes by showing that the formula KCN is derived from balancing the charges of the potassium ion and the cyanide ion.

What is the symbol for potassium in the formula for potassium cyanide?

• Po

• Pt

• K

• P

Which of the following is a polyatomic ion with a 1- charge?

• Nitrate

• Cyanide

• Sulfate

• Chloride

What is the ionic charge of potassium in potassium cyanide?

• 0

• 1+

• 2+

• 1-

In a neutral compound like potassium cyanide, what must the sum of the oxidation numbers equal?

• 1

• 0

• -1

• 2

How do the charges of potassium and cyanide ions interact in potassium cyanide?

• They add up to a positive charge

• They cancel each other out

• They add up to a negative charge

• They remain unbalanced

What is the final formula for potassium cyanide?

• KCN

• K2CN

• KC2N

• KNC