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

C4H8
CH2
CH
C2H4


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?

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


Question 3. Sulphur has an Ar value of 32 and oxygen has an Ar value of 16. A sulphur oxide contains 6.4g of sulphur and 6.4g of oxygen. What is the empirical formula of the sulphur oxide?

SO
SO2
S2O
S2O2


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

The number of neutrons in an atom.
The proton number of 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?

CO.
CO2.
C2O.
OC2.


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