Ionic Compounds and Calcium Phosphide

The video tutorial explains how to write the formula for calcium phosphide. It begins by identifying calcium and phosphorus on the periodic table, noting their charges. The tutorial then demonstrates the crisscross method to balance these charges, resulting in the formula Ca3P2. Finally, it verifies the formula by ensuring the charges cancel out, confirming the correct formula for calcium phosphide.

Which element is identified as a metal in the video?

• Phosphorus

• Oxygen

• Calcium

• Nitrogen

What type of compound is formed between a metal and a non-metal?

• Hydrogen

• Metallic

• Ionic

• Covalent

What is the charge of calcium when it forms an ionic bond?

• 1+

• 2+

• 4+

• 3+

What is the charge of phosphorus in the context of forming calcium phosphide?

• 1-

• 4-

• 3-

• 2-

What method is used to balance the charges in calcium phosphide?

• Substitution

• Crisscross

• Cross-multiplication

• Elimination

What is the formula derived for calcium phosphide using the crisscross method?

• CaP

• Ca3P2

• Ca2P3

• CaP2

How many calcium ions are needed to balance the charge of two phosphorus ions?

• 3

• 2

• 1

• 4

What is the total positive charge contributed by three calcium ions?

• 3+

• 4+

• 5+

• 6+

What is the total negative charge contributed by two phosphorus ions?

• 5-

• 4-

• 6-

• 3-

What is the final formula for calcium phosphide as concluded in the video?

• CaP2

• Ca3P2

• Ca2P3

• CaP