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. 3.1g of phosphorus reacts with oxygen to make 7.1g of phosphorus oxide. What is the empirical formula of this oxide?

PO2.5
P2O5
P2.5O
P1O2.5


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

OC2.
CO2.
CO.
C2O.


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?

S2O2
SO2
SO
S2O


Question 4. How would you find the mass increase due to oxygen in the oxidation of magnesium?

Subtract the mass before oxidation from the mass after oxidation.
Subtract the mass after oxidation from the mass before oxidation.
Add the masses before and after oxidation together.
Find the ratios of the masses before and after oxidation.


Question 5. Butene contains four carbon atoms and eight hydrogen atoms. What is its empirical formula (not its molecular formula)?

CH
C4H8
CH2
C2H4


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