Chemical Formulas and Ions

The video tutorial explains how to write the chemical formula for lead(II) nitrate. It begins by identifying lead and nitrate, noting that nitrate is a polyatomic ion. The tutorial then discusses the ionic nature of the compound, emphasizing the need to balance charges using the crisscross method. Finally, it verifies the formula and concludes with the correct representation of lead(II) nitrate as Pb(NO3)2.

What is the chemical symbol for lead?

• Ld

• Le

• P

• Pb

Which of the following is a polyatomic ion?

• Nitrate

• Lead

• Hydrogen

• Oxygen

What is the charge of the lead ion in lead(II) nitrate?

• 3+

• 2+

• 0

• 1+

What is the charge of the nitrate ion?

• 3-

• 1-

• 2-

• 0

What method is used to balance the charges in lead(II) nitrate?

• Addition

• Substitution

• Crisscross method

• Cross-multiplication

Why do we not write the subscript '1' in chemical formulas?

• It's too small

• It's implied

• It's incorrect

• It's unnecessary

How many nitrate ions are needed to balance the charge of one lead ion in lead(II) nitrate?

• One

• Two

• Three

• Four

What is the total negative charge contributed by two nitrate ions?

• 2-

• 1-

• 3-

• 4-

What is the final chemical formula for lead(II) nitrate?

• Pb2(NO3)3

• Pb(NO3)2

• Pb(NO3)

• PbNO3

Who is the presenter of the video?

• Dr. D

• Dr. C

• Dr. B

• Dr. A