Formal Charge

Chemistry ⇒ Chemical Bonding and Structure

Formal Charge starts at 11 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Formal Charge. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 12

Calculate the formal charge on each atom in the carbonate ion (CO₃^2-).

Calculate the formal charge on each atom in the cyanide ion (CN^-).

Calculate the formal charge on each atom in the Lewis structure of HCOOH (formic acid).

Calculate the formal charge on each oxygen atom in the ozone molecule (O₃) given the following Lewis structure: O–O=O.

Calculate the formal charge on the chlorine atom in ClO₃^- (chlorate ion).

Calculate the formal charge on the phosphorus atom in PO₄^3-.

Describe how formal charge can help distinguish between possible resonance structures.

Describe how to assign formal charges in a polyatomic ion with resonance structures.

Describe the difference between formal charge and oxidation number.

Describe the relationship between electronegativity and the placement of formal charges in a molecule.

Explain why formal charge is important in determining the preferred Lewis structure of a molecule.

Explain why resonance structures are used when formal charges cannot be minimized in a single Lewis structure.

Explain why the formal charge on oxygen in the hydroxide ion (OH^-) is -1.

Explain why the formal charge on the central atom in SF₆ is zero.

What is the formula for calculating the formal charge on an atom in a molecule?