
Empirical Formula Calculation Quiz
Interactive Video
•
Chemistry
•
9th - 10th Grade
•
Practice Problem
•
Hard
Jennifer Brown
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in calculating an empirical formula?
Multiply mole values to get whole numbers.
Divide each mole value by the smallest number of moles.
Start with the mass in grams of each element.
Convert grams to moles using molar mass.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In Example 1, what is the empirical formula for the compound containing calcium, oxygen, and hydrogen?
CaOH
Ca(OH)2
CaO2H2
Ca2H2O2
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When given percentages of elements, what assumption is made to simplify calculations?
Assume a 100g sample.
Assume a 50g sample.
Assume a 1g sample.
Assume a 200g sample.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the empirical formula for NutraSweet based on the given percentages?
C14H18N2O4
C14H18N2O5
C7H9N2O5
C7H9N1O2.5
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What should you do if a mole value ends in 0.5 during calculations?
Leave it as is.
Multiply all mole values by 3.
Multiply all mole values by 2.
Round it to the nearest whole number.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In Example 3, what is the smallest number of moles calculated for the elements in magnetite?
1.2 moles
0.68 moles
1.33 moles
0.902 moles
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the empirical formula for magnetite?
Fe2O3
FeO2
FeO
Fe3O4
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