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


Question 2. A carbon oxide is found to have a 1:1 ratio of carbon to oxygen. What is its correctly-written empirical formula?

CO2
C1O1
CO
C2O


Question 3. What's the next step once you've found the mass in grams of an element in your compound and its Ar value?

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


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

C4H8
CH
CH2
C2H4


Question 5. 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?

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


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