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Empirical And Molecular Formulas
Test Description: Practice finding empirical formulas from percent compositions
Instructions: Answer all questions to get your test result.
1) The formula with the simplest ratio of atoms is called
A
empirical formula
B
chemical formula
C
molecular formula
2) The formula showing the actual number of atoms in a compound is
A
molecular formula
B
chemical formula
C
empirical formula
3) You can find the empirical formula using
A
fruit loops
B
percent composition
C
the chemical formula
4) Determine the empirical formulas for compounds with the following percent compositions: 15.8% carbon and 84.2% sulfur
A
CS2
B
C2S4
C
C3S6
5) Determine the empirical formulas for compounds with the following percent compositions:
A
CH3O
B
CHO
C
CH2O
6) Calculate the empirical formulas of Saran Polymer: 24.8% C, 2.0% H, 73.1% Cl
A
CHCl
B
CH3Cl
C
C2H2Cl
7) Find the EF of polystyrene; 92.3% C, 7.7% H
A
CH2
B
CH
C
C2H2
8) What is the first step in finding the empirical formula?
A
Assume the percent is out of 100 and change to grams
B
Divide by the smallest
C
Find the moles
9) Which is an empirical formula?
A
C6H12O6
B
CH2O
C
C3H3O6
10) The molecular formula can also be the empirical formula
A
false
B
true
*select an answer for all questions
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