Trigonal Planar Molecular Geometry Concepts

The video tutorial explains the molecular geometry of the carbonate ion (CO32-). It describes how the three oxygen atoms are bonded to a central carbon atom and spread out to form a trigonal planar shape, according to VSEPR theory. The AXN notation is used to confirm this geometry, with A representing the central atom, X the number of bonded atoms, and N the non-bonding electron pairs. The video also discusses the bond angles of 120° and provides a visual representation of the 3D structure to confirm the trigonal planar geometry.

What is the molecular geometry of CO3(2-) based on the arrangement of oxygen atoms around the central carbon atom?

• Linear

• Bent

• Trigonal planar

• Tetrahedral

In the AXN notation for CO3(2-), what does the 'X' represent?

• The central atom

• The number of non-bonding electron pairs

• The total number of electron pairs

• The number of atoms bonded to the central atom

What is the AXN notation for CO3(2-)?

• AX3

• AX4

• AX2E

• AX2

What is the bond angle in a trigonal planar molecular geometry?

• 109.5°

• 120°

• 90°

• 180°

Which of the following is true about the bond angles in CO3(2-)?

• They are all 90°

• They are all 120°

• They vary between 90° and 120°

• They are all 180°

How can the trigonal planar geometry of CO3(2-) be confirmed?

• By using a molecular model kit

• By looking at a table of geometries

• By using a spectrometer

• By measuring bond angles with a protractor

What does the three-dimensional structure of CO3(2-) show about the arrangement of oxygen atoms?

• They form a square

• They are spread out in a plane

• They form a tetrahedral shape

• They are in a straight line

What is the significance of the bond angles in the CO3(2-) ion?

• They confirm the trigonal planar geometry

• They determine the color of the ion

• They are irrelevant to the ion's structure

• They affect the ion's solubility