Lewis Structures , Formal Charges, and Resonance

What is the formal charge on oxygen for the hydronium ion H₃O⁺?

• +3

• +1

• -2

• -3

• 0

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

When the atoms in a molecule can form two different structures (not resonance structures), formal charge can help determine the best one (where lower or zero FC is best). A and B both follow the octet rule: use formal charge to determine which structure is the better one for NH₃O.

• A is the better structure for NH₃O

• B is the better structure for NH₃O

• Both structures are equally good.

• Both structures are incorrect.

Tags

NGSS.HS-PS1-2

Which electron dot structure is correct for the element chlorine (Cl₂)?

• A

• B

• D

• D

Tags

NGSS.HS-PS1-1

Which combination of elements would be likely to form a covalent bond?

• V and X

• V and Z

• W and Y

• W and Z

• Y and Z

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

What is the formal charge on the oxygen atom at the top of this Lewis dot structure?

• 0

• +1

• -1

• -2

Tags

NGSS.HS-PS1-2

What is the picture showing?

• All of the resonance structures for carbonate.

• The formal charge on each atom in carbonate.

• The electronegativity for carbonate.

• The ionization energy for carbonate.

Tags

NGSS.HS-PS1-2

How many resonance structures for NO₃^- ion?

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-2

Which of the following forms an incomplete octet?

• CO₂

• BrCl₂

• H₂O

• BeCl₂

Which of the following applies to IF₄¹⁺

• incomplete octet

• follows the octet rules

• free radical

• expanded octet

How many resonance structures can be drawn for NOCl?

• 0

• 1

• 2

• 3