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

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


Question 2. Butene contains four carbon atoms and eight hydrogen atoms. What is its empirical formula (not its molecular formula)?

C2H4
CH2
CH
C4H8


Question 3. 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
Simplify the ratio 89.2 : 82.8
Divide both values by Ar values.
89.2g - 82.8g


Question 4. What is the Ar value of an element?

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


Question 5. If a compound has a 1:2 ratio of carbon atoms to oxygen atoms, what is its chemical formula?

OC2.
CO2.
CO.
C2O.


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