Understanding Chemical Formulas

The video tutorial explains different types of chemical formulas: empirical, molecular, and structural. It describes how chemical formulas represent the number of atoms of each element in a compound using symbols and subscripts. Molecular formulas show the actual number of atoms, while empirical formulas provide the simplest ratio. Structural formulas depict the arrangement and bonding of atoms. Examples include ethane, butane, and hexane, illustrating the differences between these formulas.

What does a chemical formula represent in a compound?

• The color of the compound

• The number of atoms of each element

• The taste of the compound

• The boiling point of the compound

What is another name for a molecular formula?

• Empirical formula

• Structural formula

• True formula

• Condensed formula

How does the molecular formula of ethane differ from its empirical formula?

• It has more carbon atoms

• It shows the smallest ratio of atoms

• It has fewer hydrogen atoms

• It shows the actual number of atoms

What is the empirical formula of butane if its molecular formula is C4H10?

• C3H8

• CH3

• C4H10

• C2H5

In which case is the molecular formula the same as the empirical formula?

• When the compound is a solid

• When the molecular formula is already in its simplest ratio

• When the compound is a gas

• When the compound is a liquid

Which of the following is an example of a compound with the same molecular and empirical formula?

• Hexane

• Ethane

• Methane

• Butane

What does a structural formula show that a molecular formula does not?

• The arrangement and bonding of atoms

• The boiling point of the compound

• The color of the compound

• The number of atoms

Which group is highlighted in the structural formula of ethanol?

• Carbonyl group

• Amino group

• Hydroxyl group

• Carboxyl group

What is the condensed structural formula of ethane?

• C2H6

• CH3CH3

• C2H5OH

• CH4

What is the expanded structural formula of butane?

• C2H5OH

• CH3CH3

• C4H10

• CH3CH2CH2CH3