Question

check the box next to each molecule on the right that has the shape of the model molecule on the left: model molecules (check all that apply) ch₂o h₃o⁺ no₃⁻ co₃²⁻ none of the above note for advanced students: the length of bonds and size of atoms in the model is not necessarily realistic. the model is only meant to show general geometry and 3d shape of the molecule. you can drag the slider to rotate the molecule.

Explanation:

Step1: Identify the shape of the model molecule

The model molecule has a trigonal - planar shape (central atom bonded to three other atoms with no lone - pairs on the central atom).

Step2: Analyze each molecule on the right

• For $\mathrm{CH_2O}$: The central carbon atom is bonded to two hydrogen atoms and one oxygen atom with no lone - pairs on carbon. It has a trigonal - planar shape.
• For $\mathrm{H_3O^+}$: The central oxygen atom has a lone - pair and is bonded to three hydrogen atoms. It has a trigonal - pyramidal shape.
• For $\mathrm{NO_3^-}$: The central nitrogen atom is bonded to three oxygen atoms with no lone - pairs on nitrogen. It has a trigonal - planar shape.
• For $\mathrm{CO_3^{2 - }}$: The central carbon atom is bonded to three oxygen atoms with no lone - pairs on carbon. It has a trigonal - planar shape.

Answer:

$\mathrm{CH_2O}$, $\mathrm{NO_3^-}$, $\mathrm{CO_3^{2 - }}$