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

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


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

OC2.
C2O.
CO.
CO2.


Question 3. Which is the correct sequence of values to calculate to find the empirical formula?

Ratio, Ar values, Masses, Division.
Ar values, Division, Ratio, Masses.
Masses, Ar values, Division, Ratio.
Division, Masses, Ar values, Ratio.


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

C4H8
CH
C2H4
CH2


Question 5. 3.1g of phosphorus reacts with oxygen to make 7.1g of phosphorus oxide. What is the empirical formula of this oxide?

PO2.5
P2.5O
P2O5
P1O2.5


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