Chromium and Cyanide Compounds

The video tutorial explains how to write the formula for chromium-6 cyanide. It begins by identifying the element symbol for chromium and explains that cyanide is a polyatomic ion with a one-minus charge. The tutorial discusses the importance of balancing charges to achieve a neutral compound, using the example of chromium with a six-plus charge. It demonstrates how to use parentheses and subscripts to balance the charges, resulting in the formula Cr(CN)6. The video concludes with a summary of the process.

What is the element symbol for chromium?

• Cr

• Cm

• Ch

• Co

Which of the following is a polyatomic ion?

• Oxide

• Chloride

• Cyanide

• Sulfide

What is the charge of the cyanide ion?

• 2+

• 1-

• 1+

• 2-

What does the Roman numeral VI indicate in Chromium-6 Cyanide?

• The number of electrons in chromium

• The atomic number of chromium

• The charge of chromium

• The number of cyanide ions

Why do we need to balance the charges in Chromium-6 Cyanide?

• To make it a neutral compound

• To decrease its stability

• To make it an ion

• To increase its reactivity

How many cyanide ions are needed to balance the charge of chromium in Chromium-6 Cyanide?

• Four

• Five

• Six

• Seven

What is the correct formula for Chromium-6 Cyanide?

• Cr(CN)3

• CrCN

• Cr2(CN)3

• Cr(CN)6