Ionic Charges and Chemical Formulas

The video tutorial explains how to write the formula for calcium dichromate. It begins by identifying calcium and dichromate, noting that dichromate is a polyatomic ion with a specific formula and charge. The tutorial discusses the ionic charges of calcium and dichromate, emphasizing the need for the charges to balance to form a neutral compound. The final formula for calcium dichromate is presented as CaCr2O7.

What is the symbol for calcium when writing chemical formulas?

• Cu

• Cl

• C

• Ca

Which of the following is a polyatomic ion?

• Carbon

• Calcium

• Dichromate

• Chlorine

What is the chemical formula for the dichromate ion?

• Cr2O4

• CrO3

• Cr2O7

• CrO4

What is the ionic charge of the dichromate ion?

• 1+

• 2-

• 2+

• 1-

What is the ionic charge of calcium in its compounds?

• 1+

• 2+

• 1-

• 2-

How do the charges of calcium and dichromate combine in calcium dichromate?

• They add up to 0

• They add up to 2+

• They add up to 1+

• They add up to 1-