Empirical vs Molecular Formulas Quiz

What is the primary difference between a molecular formula and an empirical formula?

• Empirical formulas are always longer than molecular formulas.

• Molecular formulas show the simplest ratio of atoms.

• Molecular formulas show the exact number of atoms, while empirical formulas show the simplest ratio.

• Empirical formulas show the exact number of atoms.

For water, why is the empirical formula the same as the molecular formula?

• Because water is a simple compound.

• Because the subscripts cannot be reduced further.

• Because water is a unique compound.

• Because water has no subscripts.

What is the empirical formula for glucose if its molecular formula is C6H12O6?

• C2H4O2

• CH2O

• C3H6O3

• C6H12O6

How do you derive the empirical formula for butane from its molecular formula C4H10?

• Multiply each subscript by 4.

• Multiply each subscript by 2.

• Divide each subscript by 2.

• Divide each subscript by 4.

What is the empirical formula for hexane if its molecular formula is C6H14?

• C3H7

• C6H14

• CH3

• C2H5

Why can't the empirical formula for aspirin be simplified further?

• Because it has no subscripts.

• Because the subscripts are already in the simplest ratio.

• Because aspirin is a complex compound.

• Because it is a unique compound.

What is the empirical formula for methanal if its molecular formula is CH2O?

• CH2O

• C3H6O3

• CHO

• C2H4O2

What is a key concept about empirical formulas discussed in the methanal section?

• Empirical formulas are only used for organic compounds.

• Empirical formulas are always longer than molecular formulas.

• Different compounds can share the same empirical formula.

• Empirical formulas are unique to each compound.

What should you do to find the empirical formula from a molecular formula?

• Add one to each subscript.

• Divide the subscripts by the greatest common factor.

• Multiply the subscripts by the smallest number possible.

• Subtract one from each subscript.

What is the empirical formula for ethane if its molecular formula is C2H6?

• C3H8

• C2H6

• CH4

• CH3