Understanding Chromate and Barium Ions

The video tutorial explains how to write the formula for barium chromate. It begins by identifying the element symbols for barium and chromate, noting that chromate is a polyatomic ion not found on the periodic table. The tutorial discusses the ionic charges of barium and chromate, emphasizing the need to balance these charges to achieve a neutral compound. The final formula for barium chromate is presented as BaCrO4.

What is the element symbol for barium?

• B

• Be

• Br

• Ba

Which of the following is true about the chromate ion?

• It has a charge of 2+.

• It is a polyatomic ion with a charge of 2-.

• It is a single element ion.

• It is found on the periodic table.

How can you find the charge of the chromate ion if you haven't memorized it?

• By looking it up on the periodic table.

• By checking a table of polyatomic ions.

• By asking a friend.

• By guessing based on its name.

What is the ionic charge of barium in barium chromate?

• 0

• 3+

• 2+

• 1+

What is the final formula for barium chromate?

• Ba2Cr2O7

• BaCr4

• Ba2CrO4

• BaCrO4