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Counting Elements in Chemical Formulas

Total questions: 51

Worksheet time: 26mins

Name
Class
Date
1.

Write the element name for the symbol: C ________________

a)

Carbon

b)

Calcium

c)

Chlorine

d)

Copper

2.

Write the element name for the symbol: Ne ________________

a)

Neon

b)

Nitrogen

c)

Nickel

d)

Neptunium

3.

Write the element name for the symbol: H ________________

a)

Hydrogen

b)

Helium

c)

Oxygen

d)

Nitrogen

4.

Write the element name for the symbol: Fe ________________

a)

Iron

b)

Copper

c)

Silver

d)

Lead

5.

Write the element name for the symbol: Na ________________

a)

Sodium

b)

Nitrogen

c)

Neon

d)

Nickel

6.

Write the element name for the symbol: K ________________

a)

Potassium

b)

Calcium

c)

Krypton

d)

Phosphorus

7.

Write the element name for the symbol: Ar ________________

a)

Argon

b)

Aluminum

c)

Arsenic

d)

Actinium

8.

Write the element symbol for: Helium ________________

a)

He

b)

H

c)

Li

d)

Ne

9.

Write the element symbol for: Xenon ________________

a)

Xe

b)

Xn

c)

Xo

d)

X

10.

Write the element symbol for: Calcium ________________

a)

Ca

b)

Cl

c)

C

d)

Cu

11.

Write the element symbol for: Oxygen

a)

O

b)

Ox

c)

Oy

d)

Og

12.

Write the element symbol for: Gold ________________

a)

Au

b)

Ag

c)

Fe

d)

Pb

13.

Write the element symbol for: Nitrogen ________________

a)

N

b)

Ni

c)

Ne

d)

Nt

14.

Write the element symbol for: Chlorine ________________

a)

Cl

b)

Ch

c)

Ci

d)

Cn

15.

List the elements present in the compound shown (water molecule diagram with O in center and two H attached): There is a total of ______ Elements in this compound

a)

Hydrogen, Oxygen, 2

b)

Hydrogen, Nitrogen, 3

c)

Oxygen, Carbon, 2

d)

Hydrogen, Helium, 2

16.

List the elements present in the compound shown:

a)

Nitrogen, Hydrogen, 2

b)

Oxygen, Carbon, 2

c)

Sulfur, Hydrogen, 2

d)

Chlorine, Nitrogen, 2

17.

List the elements present in the compound shown: There is a total of ______ Elements in this compound

a)

Sodium, Chlorine, 2

b)

Sodium, Oxygen, 2

c)

Chlorine, Oxygen, 2

d)

Sodium, Potassium, 2

18.

List the elements present in the chemical formula C9H13N:

a)

Carbon, Hydrogen, Nitrogen

b)

Carbon, Oxygen, Nitrogen

c)

Carbon, Hydrogen, Oxygen

d)

Hydrogen, Nitrogen, Oxygen

19.

List the elements present in the chemical formula CaCl2:

a)

Calcium, Chlorine, 2

b)

Calcium, Carbon, Chlorine

c)

Calcium, Chlorine, Oxygen

d)

Calcium, Chlorine, Hydrogen

20.

List the elements present in the chemical formula HCl:

a)

Hydrogen, Chlorine

b)

Hydrogen, Oxygen

c)

Chlorine, Oxygen

d)

Hydrogen, Nitrogen

21.

How many total elements are in the following model?

a)

3

b)

2

c)

4

d)

5

22.

How many total elements are in the following model?

a)

3

b)

2

c)

4

d)

5

23.

How many total elements are in the following model?

a)

2

b)

3

c)

4

d)

5

24.

How many total elements are in the chemical formula CH4?

a)

2

b)

3

c)

4

d)

5

25.

How many total elements are in the chemical formula CH3OH?

a)

3

b)

2

c)

4

d)

5

26.

How many total elements are in the chemical formula AlCl3?

a)

2

b)

3

c)

4

d)

1

27.

How many total elements are in the following model?

a)

3

b)

2

c)

4

d)

5

28.

How many total elements are in the following model?

a)

3

b)

2

c)

4

d)

5

29.

How many total elements are in the following model?

a)

2

b)

3

c)

4

d)

5

30.

How many Carbon atoms are present in C9H13N?

a)

9

b)

7

c)

13

d)

1

31.

How many Hydrogen atoms are present in C9H13N?

a)

13

b)

9

c)

12

d)

15

32.

How many Nitrogen atoms are present in C9H13N?

a)

1

b)

2

c)

3

d)

0

33.

How many total atoms are present in C9H13N?

a)

23

b)

21

c)

19

d)

25

34.

How many total elements are present in C9H13N?

a)

3

b)

2

c)

4

d)

5

35.

How many Calcium atoms are present in CaCl2?

a)

1

b)

2

c)

3

d)

0

36.

How many Chlorine atoms are present in CaCl2?

a)

2

b)

1

c)

3

d)

4

37.

How many total atoms are present in CaCl2?

a)

3

b)

2

c)

4

d)

5

38.

How many total elements are present in CaCl2?

a)

2

b)

3

c)

1

d)

4

39.

How many Hydrogen atoms are present in HCl?

a)

1

b)

2

c)

3

d)

0

40.

How many Chlorine atoms are present in HCl?

a)

1

b)

2

c)

3

d)

0

41.

How many total atoms are present in HCl?

a)

2

b)

1

c)

3

d)

4

42.

How many total elements are present in HCl?

a)

2

b)

1

c)

3

d)

4

43.

How many atoms of each element are present in the first molecular model (CO2H2)? Fill in the table:
Elements | # of Atoms
C | ___
O | ___
H | ___

a)

C | 1
O | 2
H | 2

b)

C | 2
O | 1
H | 2

c)

C | 2
O | 2
H | 1

d)

C | 1
O | 1
H | 2

44.

How many atoms of each element are present in the second molecular model (CH3OH)? Fill in the table:
Elements | # of Atoms
C | ___
O | ___
H | ___

a)

C | 1
O | 1
H | 4

b)

C | 2
O | 1
H | 6

c)

C | 1
O | 2
H | 2

d)

C | 1
O | 1
H | 3

45.

How many atoms of each element are present in the third molecular model (C2H6)? Fill in the table:
Elements | # of Atoms
C | ___
H | ___

a)

C | 2
H | 6

b)

C | 3
H | 8

c)

C | 6
H | 2

d)

C | 2
H | 2

46.

How many atoms of each element are present in the chemical formula CH4? Fill in the table:
Elements | # of Atoms
C | ___
H | ___

a)

C | 1 H | 4

b)

C | 4 H | 1

c)

C | 2 H | 2

d)

C | 1 H | 2

47.

How many atoms of each element are present in the chemical formula CH3OH? Fill in the table: Elements | # of Atoms C | ___ H | ___ O | ___

a)

C | 1 H | 4 O | 1

b)

C | 1 H | 3 O | 2

c)

C | 2 H | 4 O | 1

d)

C | 1 H | 6 O | 1

48.

How many atoms of each element are present in the chemical formula AlCl3? Fill in the table: Elements | # of Atoms Al | ___ Cl | ___

a)

Al | 1 Cl | 3

b)

Al | 3 Cl | 1

c)

Al | 2 Cl | 3

d)

Al | 1 Cl | 2

49.

For the molecule with the structure H2CO (formaldehyde), fill in the blanks: _____ total elements _____ total atoms

a)

3 total elements 4 total atoms

b)

2 total elements 3 total atoms

c)

4 total elements 5 total atoms

d)

2 total elements 4 total atoms

50.

For the molecule with the structure CaCO3 (calcium carbonate), fill in the blanks: _____ total elements _____ total atoms

a)

3 total elements 5 total atoms

b)

2 total elements 4 total atoms

c)

4 total elements 6 total atoms

d)

3 total elements 6 total atoms

51.

For the molecule with the structure MgCl2 (magnesium chloride), fill in the blanks: _____ total elements _____ total atoms

a)

2 total elements 3 total atoms

b)

3 total elements 2 total atoms

c)

2 total elements 2 total atoms

d)

3 total elements 3 total atoms

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