Lewis Structures
Chemistry ⇒ Chemical Bonding and Structure
Lewis Structures starts at 9 and continues till grade 12.
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See sample questions for grade 12
Calculate the formal charge on each atom in the Lewis structure of the nitrite ion (NO2-).
Calculate the formal charge on the central atom in the Lewis structure of SO42-.
Calculate the total number of valence electrons in the Lewis structure of ClO4-.
Calculate the total number of valence electrons in the Lewis structure of the phosphate ion (PO43-).
Describe the concept of resonance as it applies to Lewis structures.
Describe the steps involved in drawing a Lewis structure for a polyatomic ion.
Draw the Lewis structure for the nitrate ion (NO3-) and state the formal charge on the central atom.
Explain why some elements in period 3 and beyond can have more than eight electrons in their Lewis structures.
Which molecule has a lone pair on the central atom in its Lewis structure? (1) CO2 (2) H2O (3) BF3 (4) CCl4
Which molecule violates the octet rule by having fewer than eight electrons around the central atom? (1) BeCl2 (2) PCl5 (3) SF6 (4) XeF4
Which of the following best describes a coordinate covalent bond in a Lewis structure? (1) Both atoms contribute one electron each to the bond (2) One atom donates both electrons to the bond (3) The bond is between two metals (4) The bond is ionic
Which of the following elements can have an expanded octet in its Lewis structure? (1) Carbon (2) Nitrogen (3) Sulfur (4) Fluorine
In the Lewis structure of SF6, the central atom has ______ bonding pairs and ______ lone pairs.
In the Lewis structure of the hydronium ion (H3O+), the central atom has ______ lone pairs.
The Lewis structure of methane (CH4) contains ______ single bonds.
The Lewis structure of PF5 contains ______ bonding pairs and ______ lone pairs on the central atom.
True or False: In the Lewis structure of NH4+, the nitrogen atom has no lone pairs.
True or False: The Lewis structure of BF3 shows boron with a complete octet.
True or False: The Lewis structure of ClO3- shows chlorine with an expanded octet.
True or False: The Lewis structure of CO2 contains two double bonds.
