Writing Formulas for Ionic Compounds with Polyatomic Ions

The video tutorial explains how to write chemical formulas for ionic compounds, focusing on both monatomic and polyatomic ions. It provides examples of five polyatomic ions: ammonium, carbonate, hydrogen carbonate, hydroxide, and sulfate. The tutorial then walks through the process of writing chemical formulas for compounds like calcium carbonate, aluminum hydroxide, ammonium chloride, ammonium sulfate, and sodium hydrogen carbonate, emphasizing the importance of understanding ion charges and ratios.

What type of ions are made up of only one atom?

• Polyatomic ions

• Covalent ions

• Monatomic ions

• Neutral ions

Which of the following is a polyatomic ion?

• O2-

• NH4+

• Cl-

• Na+

What is the charge of the carbonate ion (CO3)?

• 1-

• 2-

• 1+

• 2+

In the formula for calcium carbonate, what is the ratio of calcium ions to carbonate ions?

• 1:2

• 2:1

• 1:1

• 3:1

What is the charge of the aluminum ion in aluminum hydroxide?

• 2+

• 1+

• 4+

• 3+

How many hydroxide ions are needed to balance one aluminum ion in aluminum hydroxide?

• 1

• 2

• 3

• 4

What is the chemical formula for ammonium chloride?

• NH4Cl

• NH4Cl2

• NH3Cl

• NH2Cl

Which of the following compounds contains both ionic and covalent bonds?

• NaCl

• Al(OH)3

• NH4Cl

• CaCO3

What is the ratio of ammonium ions to sulfate ions in ammonium sulfate?

• 1:2

• 2:1

• 3:1

• 1:1

What is the chemical formula for sodium bicarbonate?

• NaHCO2

• NaHCO3

• Na2CO3

• NaCO3