Molecular Geometry of Methane

The video tutorial explains the Lewis structure of methane (CH4), highlighting that all electrons are involved in chemical bonds, resulting in zero lone pairs. It further explores the 3D tetrahedral geometry of methane, with a bond angle of 109.5 degrees. The absence of lone pairs is emphasized, as they would alter the molecular geometry. The tutorial concludes with a recap of these key points.

What is the first step in analyzing the structure of methane (CH4)?

• Identify the molecular geometry

• Draw the Lewis structure

• Measure the bond angles

• Count the number of atoms

In the Lewis structure of methane, what type of electron pairs are present?

• Lone pairs

• Bonding pairs

• Free electrons

• Ionic pairs

How many lone pairs of electrons are present in methane (CH4)?

• One

• Zero

• Two

• Three

What is the molecular geometry of methane (CH4)?

• Bent

• Tetrahedral

• Trigonal planar

• Linear

What is the bond angle in the tetrahedral geometry of methane?

• 120 degrees

• 109.5 degrees

• 90 degrees

• 180 degrees

What effect would a lone pair have on methane's molecular geometry?

• It would have no effect

• It would increase the bond angle

• It would change the geometry from tetrahedral

• It would make the geometry linear

What confirms that all electron pairs in methane are bonding pairs?

• The Lewis structure analysis

• The molecular weight of methane

• The presence of lone pairs

• The absence of free electrons

Who is the narrator of the video?

• Dr. C

• Dr. D

• Dr. B

• Dr. A