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Worksheets

Empirical Vs. Molecular Formulas

Total questions: 20

Worksheet time: 29mins

Name
Class
Date
1.
A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________
a)
ionic formula
b)
covalent formula
c)
empirical formula
d)
molecular formula
2.
A formula with the lowest whole # ratio of elements in a compound is called
a)
Molecular Formula
b)
Chemical Formula
c)
Empirical Formula 
d)
Distance Formula
3.

How many Carbons "C" are in C18H34O3

a)

18

b)

34

c)

3

d)

37

4.

Which molecular formula only has 12 hydrogens "H"?

a)

C4H10 (butane)

b)

C5H12 (pentane)

c)

C12H22O11 (sugar)

d)

C8H10N4O2 (caffeine)

5.

What is the empirical formula for C4H6?

a)

CH

b)

CH3

c)

C2H3

d)

C4H6

6.

What is the empirical formula for N2S3?

a)

NS

b)

N3S2

c)

N2S3

d)

N1S1.5

7.

Si2F6

Choose the correct empirical formula...

a)

SiF

b)

Si2F6

c)

SiF3

d)

Si6F2

8.

What is the empirical formula for:

C2H6O4

a)

CHO

b)

CH2O

c)

CO2

d)

CH3O2

9.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6Oand C2H6O2
d)
CH4 and C2H6
10.
What is the empirical formula of the following molecular formula:  C3H6
a)
C3H6
b)
CH2
c)
C2H4
d)
CH3
11.

Which one is an empirical (cannot be simplified further)

a)

H2O2

b)

C2H6O12

c)

CaCl2

d)

N2O8

12.

What is the empirical formula for the following molecular formula: C6H14

a)

C6H14

b)

C3H7

c)

CH2

d)

CH3

13.
What is the empirical formula for the following:
Pb5Cr5O20
a)
Pb2Cr2O10
b)
PbCr2O7
c)
Pb9Cr4O2
d)
PbCrO4
14.

Which is not an empirical formula

a)

H2O

b)

NaCl

c)

FeCl2

d)

C2H4

15.

Select all empirical formulas

a)

C8H12

b)

C2H3

c)

CH3

d)

C4H10

e)

C2H5

16.

What is the empirical formula for hydrogen peroxide in the picture?

a)

H2O2

b)

H2O

c)

HO

d)

HO2

17.

Which is not considered an empirical formula?

a)

P4H10

b)

P2H5

c)

H2CO3

d)

NaCl

18.

Which is not considered an empirical formula?

a)

SiO2

b)

CCl4

c)

CH2O

d)

C4H10

19.

Which of these is considered to be an empirical formula

a)

CO2

b)

C3H6

c)

C2H6

d)

C2O4

20.

Which of these formulas is an empirical formula?

a)

N2O4

b)

N2O

c)

N2O6

d)

N4O4