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Empirical And Molecular Formulas
Test Description: This will assess students understanding of empirical and molecular formulas.
Instructions: Answer all questions to get your test result.
1) A formula with the lowest whole # ratio of elements in a compound is called ______________.
A
covalent formula
B
molecular formula
C
chemical formula
D
empirical formula
2) A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called ____________.
A
empirical formula
B
molecular formula
C
ionic formula
D
covalent formula
3) Which of the following is an empirical formula?
A
H2O2
B
P4O10
C
N2O
D
C2H4
4) All of the following are empirical formulas EXCEPT
A
C3H8
B
Al3(SO4)2
C
N2O4
D
Na2SO4
5) Which of the following is the correct empirical formula for C4H10?
A
C4H10
B
C8H20
C
CH2.5
D
C2H5
6) A substance has a molecular formula of C8H10N4O2. The empirical formula is
A
C2H6N2O
B
C9H7N3O
C
CHNO
D
C4H5N2O
7) A compound is 25.9% nitrogen and 74.1% oxygen. Find its empirical formula.
A
N2O4
B
N4O6
C
N2O5
D
NO
8) Determine the empirical formula for a compound with 87.1% Ag and 12.9% S.
A
Ag3S5
B
Ag4S2
C
AgS2
D
Ag2S
9) The empirical formula of a substance is CH2O. Its molar mass is 180. What is the molecular formula?
A
C2H4O2
B
C4H8O4
C
C8H16O8
D
C6H12O6
10) Epinephrine (adrenaline) is a hormone secreted into the bloodstream in times of stress. It contains 59.0% C, 7.15% H, 26.20% O, and 7.65% N and has a molar mass of 183 g/mol. What is its molecular formula?
A
C5H11N3O2
B
C9H13NO3
C
C7H9N2O
D
C8H12NO2
*select an answer for all questions
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