Combining Cations & Anions to Name Ionic Compounds

In this video, Kevin Tolkoff explains how to write chemical formulas for various compounds. He provides detailed examples, including calcium chloride, aluminum sulfate, aluminum phosphate, sodium nitride, and ferric perchlorate. The video emphasizes understanding ion charges and using them to determine the correct chemical formula. It also highlights the importance of writing ions first for partial credit in exams.

What is the charge of calcium when writing the formula for calcium chloride?

• 1+

• 2-

• 2+

• 1-

Which group does aluminum belong to, and what is its charge in aluminum sulfate?

• Group 4, 4+

• Group 3A, 3+

• Group 2, 2+

• Group 1, 1+

What is the correct formula for aluminum phosphate after simplifying?

• Al3(PO4)3

• Al3PO4

• AlPO4

• Al(PO4)3

What is the charge of sodium in sodium nitride?

• 1+

• 2+

• 3+

• 1-

What is the charge of nitrogen in sodium nitride?

• 1+

• 2-

• 3-

• 1-

What is the charge of iron in ferric perchlorate?

• 2+

• 3+

• 1+

• 4+

How many perchlorate ions are needed to balance the charge of iron in ferric perchlorate?

• One

• Four

• Two

• Three