Sodium and Dichromate Concepts

The video tutorial explains how to write the formula for sodium dichromate. It begins by identifying sodium and dichromate, highlighting that dichromate is a polyatomic ion not found on the periodic table. The formula for the dichromate ion is given as Cr2O7 with a 2- charge. The tutorial then discusses the ionic nature of the compound, noting that sodium has a 1+ charge. To balance the charges, two sodium atoms are needed, resulting in the formula Na2Cr2O7. The video concludes with a recap of the formula derivation process.

What is the element symbol for sodium?

• So

• Sd

• Na

• S

What does the 'ate' suffix in dichromate indicate?

• It's a transition metal

• It's a polyatomic ion

• It's a metal

• It's a noble gas

What is the formula for the dichromate ion?

• CrO3

• Cr3O8

• Cr2O7

• CrO4

What is the ionic charge of the dichromate ion?

• 1-

• 2-

• 1+

• 2+

How many sodium atoms are needed to balance the charge of one dichromate ion?

• Four

• Three

• Two

• One

What is the final formula for sodium dichromate?

• Na2Cr2O7

• NaCrO4

• Na2CrO4

• NaCr2O7