Snapquiz - Empirical Formula

Question 1. Butene contains four carbon atoms and eight hydrogen atoms. What is its empirical formula (not its molecular formula)?

C₄H₈
CH₂
C₂H₄
CH

Question 2. 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

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

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

Question 4. 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 5. If a compound has a 1:2 ratio of carbon atoms to oxygen atoms, what is its chemical formula?

C₂O.
CO₂.
CO.
OC₂.

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