Empirical and Molecular Formula Worksheet

Which of the following best describes an empirical formula?

• It shows the simplest ratio of elements in a compound.

• It shows the exact number of atoms of each element in a molecule.

• It provides the structural arrangement of atoms.

• It indicates the physical properties of a compound.

Which of the following best describes a molecular formula?

• It shows the simplest whole-number ratio of atoms in a compound.

• It shows the actual number of each type of atom in a molecule.

• It shows only the types of atoms present, not their quantities.

• It shows the arrangement of atoms in a molecule.

A student is given the formula CH2O. What reasoning supports that this is already the empirical formula?

• The subscripts can be divided by 2 to simplify further.

• The ratio of atoms is already the simplest whole-number ratio.

• The formula represents the actual number of atoms in a molecule.

• The formula can be expanded to C6H12O6.

Which of the following steps is NOT typically involved in converting a molecular formula into an empirical formula?

• Identifying subscripts in the molecular formula

• Finding the greatest common divisor (GCD) of the subscripts

• Simplifying ratios to their lowest whole-number form

• Balancing chemical equations

How do molecular and empirical formulas help chemists analyze compounds and chemical patterns?

• They allow chemists to identify the color of compounds.

• They help chemists determine the exact number and ratio of atoms in compounds, revealing chemical patterns.

• They are used to measure the temperature of reactions.

• They help chemists find the melting point of compounds.

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NGSS.HS-PS1-1

Which of the following best describes how empirical formulas simplify molecular data?

• By providing the exact structure of molecules

• By simplifying complex molecular information into easily comparable elemental ratios

• By listing all possible isomers of a compound

• By showing the physical properties of compounds

What is the empirical formula of C₆H₁₂O₆?

• C₆H₁₂O₆

• CH₂O

• C₃H₆O₃

• C₂H₄O₂

Why do chemists use empirical formulas?

• To show the exact number of atoms in a molecule

• To represent the simplest whole-number ratio of atoms in a compound

• To display the 3D shape of a molecule

• To indicate the physical state of a compound

What is the empirical formula for the molecular formula C₃H₆O₃?

• CH₂O

• C₃H₆O₃

• C₂H₄O₂

• CHO

MATCH THE EMPIRICAL AND MOLECULAR FORMULAS.

a

b