Snapquiz - Empirical Formula

This is the Snapquiz on Empirical Formula. Click here or use the embedded video if you haven't watched the lesson yet.


Question 1. If a compound has a 1:2 ratio of carbon atoms to oxygen atoms, what is its chemical formula?

OC2.
CO2.
C2O.
CO.


Question 2. 89.2g of lead oxide is heated with carbon, which reduces it (removes its oxygen). Afterwards 82.8g of pure lead is left. How would we find the mass of oxygen lost?

82.8g - 89.2g
89.2g - 82.8g
Simplify the ratio 89.2 : 82.8
Divide both values by Ar values.


Question 3. What is the Ar value of an element?

The proton number of an atom.
The mass number of an atom.
The charge on an atom.
The number of neutrons in an atom.


Question 4. Butene contains four carbon atoms and eight hydrogen atoms. What is its empirical formula (not its molecular formula)?

CH
C4H8
CH2
C2H4


Question 5. What's the next step once you've found the mass in grams of an element in your compound and its Ar value?

Find the ratio of the mass to the ArSubtract the Ar value from the mass.
Divide the mass by the Ar value.
Find the ratio of the Ar values to each other.


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