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.
C2O.
CO2.
CO.


Question 2. 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 Ar values to each other.
Subtract the Ar value from the mass.
Find the ratio of the mass to the ArDivide the mass by the Ar value.


Question 3. 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.
Add the masses before and after oxidation together.
Find the ratios of the masses before and after oxidation.
Subtract the mass before oxidation from the mass after oxidation.


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

C4H8
CH2
C2H4
CH


Question 5. A carbon oxide is found to have a 1:1 ratio of carbon to oxygen. What is its correctly-written empirical formula?

C1O1
C2O
CO2
CO


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