
Empirical and Molecular Formulas
Interactive Video
•
Chemistry
•
9th - 10th Grade
•
Practice Problem
•
Hard
Patricia Brown
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main advantage of using chemical formulas like CO2 instead of writing out the full compound name?
It simplifies the representation and calculations.
It makes the compound sound more scientific.
It allows for more creative naming.
It is required by chemical regulations.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is true about the empirical formula?
It is used only for organic compounds.
It is always the same as the molecular formula.
It indicates the simplest whole number ratio of atoms.
It shows the exact number of atoms in a molecule.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the empirical formula for hydrogen peroxide?
O2H
HO
H2O2
H2O
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the example of calculating the empirical formula from masses, what is the first step?
Calculate the molar mass of the compound.
Construct a table and write down the masses of all constituents.
Find the percentage composition of each element.
Determine the molecular formula first.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the empirical formula for the hydrated compound in Example 1?
CaCl2
Ca2Cl4
CaCl2·4H2O
CaH2O
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is the factor 'n' determined when finding the molecular formula from the empirical formula?
By adding the empirical formula mass to the molar mass.
By dividing the molar mass by the empirical formula mass.
By multiplying the empirical formula mass by the molar mass.
By dividing the empirical formula mass by the molar mass.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the molecular formula of vitamin C given its empirical formula is C3H4O3 and n is 2?
C3H4O3
C12H16O12
C6H8O6
C9H12O9
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