Methane and Alkane Properties

The video tutorial explains the molecular formula of methane (CH4), its representation as a Lewis dot structure, and its tetrahedral molecular geometry with bond angles of 109.5 degrees. It discusses the general formula pattern for alkanes (CnH2n+2) and demonstrates how to calculate methane's chemical formula. The tutorial concludes with a recommendation to memorize the formula.

What is the molecular formula of methane?

• CH3

• C2H6

• C3H8

• CH4

What is the shape of methane's molecular geometry?

• Trigonal planar

• Bent

• Linear

• Tetrahedral

What is the bond angle in methane's tetrahedral structure?

• 180 degrees

• 90 degrees

• 109.5 degrees

• 120 degrees

What elements make up alkanes?

• Carbon and Hydrogen

• Carbon and Nitrogen

• Carbon and Sulfur

• Carbon and Oxygen

What is the general formula for alkanes?

• CnH2n-2

• CnH2n+2

• CnH2n

• CnHn

How many hydrogen atoms are in methane?

• 2

• 3

• 4

• 5

In the formula CnH2n+2, what does 'n' represent?

• Number of hydrogen atoms

• Number of carbon atoms

• Number of oxygen atoms

• Number of bonds