CC U2 Empirical Formula

LL 2.6 Determining Empirical Formulas​

1. Video 1: Review of Formula & structures

   1. Practice Questions

2. Video 2: % Comp to Empirical Formula

   1. Practice Questions

3. Video 3: Empirical Formula to Molecular Formula

   1. Practice Questions

Empirical Formulas​

Multiple Choice

If black ball represents carbon (C) atom and white balls represent hydrogen (H) atoms. What is the molecular formula of the diagram shown?

• CH

• CH₄

• C₄H

• C₄H₄

Multiple Choice

Do the diagrams have the same empirical formula?

• Yes

• No

Multiple Choice

A formula with the lowest whole # ratio of elements in a compound is called

• Molecular Formula
• Chemical Formula
• Empirical Formula 
• Distance Formula

Multiple Choice

Which of the following is considered an empirical formula?

• CH₃COOH
• C₆H₁₂O₆
• H₂O

Multiple Choice

What is the empirical formula for N₂S₃?

• NS

• N₃S₂

• N₂S₃

• N₁S_1.5

Reorder

Reorder the following steps to find the empirical formula

• Percent to Mass

• Mass to Mole

• Divide By Small

• Multiply til whole

1

2

3

4

• 1
• 2
• 3
• 4

Multiple Choice

To get a whole number I would multiply #.33 by ...

• 4

• 3

• 2

Multiple Choice

Which one is the empirical formula?

C₄H₆

• CH

• CH₃

• C₂H₃

• C₄H₆

Multiple Choice

Both of these molecules are _____

• Sweet smelling

• Fishy smelling

• Isomers

• Ionic compounds

• Metallic

Multiple Choice

A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________

• ionic formula
• covalent formula
• empirical formula
• molecular formula

Multiple Choice

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

• CH₂O
• C₂H₄O₂
• C₄H₈O₄
• C₆H₁₂O₆