Cobalt and Phosphide Compounds

The video tutorial explains how to write the formula for Cobalt(II) Phosphide. It begins by identifying the element symbols for Cobalt and Phosphorus, noting the importance of using correct symbols to avoid confusion. The tutorial then discusses the charges of these elements, highlighting Cobalt as a transition metal with a 2+ charge and Phosphorus with a 3- charge. The crisscross method is used to balance these charges, resulting in a neutral compound. The video concludes with a verification of the formula, ensuring the net charge is zero.

What is the correct symbol for Cobalt when writing the formula for Cobalt(II) phosphide?

• Cl

• C

• Co

• Cb

Which element symbol represents Phosphorus in the formula for Cobalt(II) phosphide?

• Po

• Ph

• P

• Ps

What type of compound is formed between Cobalt and Phosphorus?

• Covalent

• Ionic

• Molecular

• Metallic

What is the charge of Cobalt in Cobalt(II) phosphide?

• 2+

• 1+

• 4+

• 3+

What is the charge of Phosphorus in Cobalt(II) phosphide?

• 1-

• 4-

• 2-

• 3-

Which method is used to balance the charges in Cobalt(II) phosphide?

• Elimination

• Cross-multiplication

• Crisscross

• Substitution

How many Cobalt ions are needed to balance the charge with Phosphorus in Cobalt(II) phosphide?

• 1

• 4

• 2

• 3

How many Phosphorus ions are needed to balance the charge with Cobalt in Cobalt(II) phosphide?

• 2

• 4

• 1

• 3

What is the net charge of the Cobalt(II) phosphide compound?

• 0

• 1+

• 3+

• 2-

Why is it important to verify the net charge of Cobalt(II) phosphide?

• To determine if it is a molecular compound

• To check if it is a metallic compound

• To confirm it is a covalent compound

• To ensure it is a stable compound