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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
empirical formula
B
molecular formula
C
covalent formula
D
chemical formula
2) A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called ____________.
A
covalent formula
B
empirical formula
C
molecular formula
D
ionic formula
3) Which of the following is an empirical formula?
A
N2O
B
H2O2
C
P4O10
D
C2H4
4) All of the following are empirical formulas EXCEPT
A
Al3(SO4)2
B
N2O4
C
C3H8
D
Na2SO4
5) Which of the following is the correct empirical formula for C4H10?
A
CH2.5
B
C2H5
C
C8H20
D
C4H10
6) A substance has a molecular formula of C8H10N4O2. The empirical formula is
A
C2H6N2O
B
C4H5N2O
C
CHNO
D
C9H7N3O
7) A compound is 25.9% nitrogen and 74.1% oxygen. Find its empirical formula.
A
N4O6
B
NO
C
N2O5
D
N2O4
8) Determine the empirical formula for a compound with 87.1% Ag and 12.9% S.
A
Ag3S5
B
AgS2
C
Ag2S
D
Ag4S2
9) The empirical formula of a substance is CH2O. Its molar mass is 180. What is the molecular formula?
A
C8H16O8
B
C4H8O4
C
C6H12O6
D
C2H4O2
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
C7H9N2O
B
C5H11N3O2
C
C8H12NO2
D
C9H13NO3
*select an answer for all questions
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