Empirical, Molecular Formulas and Percent Composition

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

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

What is the empirical formula for C₄H₆?

• CH

• CH₃

• C₂H₃

• C₄H₆

What is the empirical formula for N₂S₃?

• NS

• N₃S₂

• N₂S₃

• N₁S_1.5

C₂F₆

Choose the correct empirical formula...

• CF

• C₂F₆

• C₆F₂

• CF₃

What is the best definition for subscript?
 

• The big number that tells you the number of molecules.
• The atomic number
• The little number that tells the number of atoms for each element.

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

C₂H₆O

Which is the correct empirical formula

• CHO

• C₂H₆O

• C₄H₁₄O₂

• None

How many Carbons "C" are in C₁₈H₃₄O₃

• 18

• 34

• 3

• 37

Which molecular formula only has 12 hydrogens "H"?

• C₄H₁₀ (butane)

• C₅H₁₂ (pentane)

• C₁₂H₂₂O₁₁ (sugar)

• C₈H₁₀N₄O₂ (caffeine)

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇
• C₂H₄O₂ and C₆H₁₂O₆
• C₃H₆O₃ and C₂H₆O₂
• CH₄ and C₂H₆