Molecular Geometry and Bond Angles

The video tutorial explores the molecular geometry of C2H4, focusing on the central carbon atoms. It explains the use of VSEPR theory to understand how atoms spread out in three dimensions. The tutorial introduces AXN notation to determine the molecular shape, identifying C2H4 as having a trigonal planar geometry with 120° bond angles. The explanation is supported by a step-by-step analysis of the Lewis structure and the arrangement of atoms.

What is the central atom considered in the molecular geometry of C2H4?

• Oxygen

• Carbon

• Nitrogen

• Hydrogen

According to VSEPR theory, how do atoms in a molecule arrange themselves?

• In a straight line

• As far apart as possible in three dimensions

• Close together in a cluster

• In a circle

What does the 'X' represent in the AXN notation for molecular geometry?

• The type of bonds

• The central atom

• The number of atoms bonded to the central atom

• The number of lone pairs

How many atoms are bonded to the central carbon in C2H4 according to AXN notation?

• 5

• 4

• 2

• 3

What is the molecular shape of C2H4 as determined by AXN notation?

• Linear

• Tetrahedral

• Bent

• Trigonal planar

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

• 120°

• 180°

• 109.5°

• 90°

How many degrees do the bond angles in C2H4 add up to?

• 180°

• 240°

• 360°

• 300°

Which of the following is NOT a feature of the trigonal planar shape?

• 120° bond angles

• Atoms spread out in a plane

• Presence of lone pairs

• Three bonded atoms

What is the significance of the AXN notation in molecular geometry?

• It predicts the reactivity of the molecule

• It helps in identifying the molecular shape

• It determines the color of the molecule

• It measures the mass of the molecule

What is the molecular geometry of C2H4?

• Trigonal planar

• Bent

• Linear

• Tetrahedral