Free Printable Counting Atoms Practice

1.

How many Hydrogen are in 4H₂O?

a)

6

b)

8

c)

2

d)

4

2.

How many Oxygen are in H₂O?

a)

1

b)

2

c)

0

d)

4

3.

How many Magnesium are in 10MgCl₂?

a)

10

b)

5

c)

20

4.

Number of H in 3(NH₄)₂CrO₄

a)

4

b)

2

c)

8

d)

24

5.

How many atoms are there TOTAL in:
H₂SO₄

a)

6

b)

5

c)

7

d)

3

6.

How many Sodium (Na) are in 6NaCl?

a)

1

b)

12

c)

6

7.

Number of N in (NH₄)₂CrO₄

a)

1

b)

2

c)

8

d)

16

8.

How many Sodium (Na) are in 6NaCl?

a)

1

b)

12

c)

6

9.

A subscript is the small number below a(n) ________ that tells the number of _______ of that element.

a)

element symbol; atoms

b)

atom; element symbol

c)

subscript; protons

d)

compound; elements

10.

How many O's are in Al₂(SO₄)₃

a)

4

b)

12

c)

7

d)

24

11.

What does the subscript in a chemical formula tell you?

a)

How many molecules are present

b)

How many atoms are present

c)

How many elements are present

d)

How many neutrons are present

12.

How many elements are in this chemical formula?

$H_2SO_4$

a)

1

b)

2

c)

3

d)

4

13.

How many atoms of Carbon are in this formula? $C_{6\ }H_{12}O_6$

a)

6

b)

1

c)

12

14.

What elements are represented in this chemical formula? $Fe_2O_3$

a)

Iron, Oxygen

b)

Francium, Europium, Oxygen

c)

Ferrium, Oxygen

d)

Berylium, Oxygen

15.

What is the total number of atoms in this formula? $H_2O_2$

a)

2

b)

4

c)

3

16.

How many more atoms of Oxygen than than Magnesium are in this formula? (subtraction) $MgSO_4$

a)

4

b)

3

c)

2

d)

6

17.

Which of the following elements is least likely to form a compound?

a)

Hydrogen

b)

Sodium

c)

Argon

d)

Potassium

18.

Which of the following is a molecule of a compound?

a)

$H_2$

b)

$Cl_2$

c)

$H_2O$

d)

$F_2$

19.

Which chemical formula correctly displays 1 atom of nickel and 2 atoms of Fluorine?

a)

niF2

b)

NIF₂

c)

Ni₁F₂

d)

NiF₂

20.

What is the total number of atoms in this chemical formula? $C_8H_3NaBr_{12}$

a)

18

b)

12

c)

25

d)

24

21.

Which element has the greatest number of atoms? $AgNO_3$

a)

Silver

b)

Gold

c)

Nitrogen

d)

Oxygen

22.

How many elements are in this chemical formula? $NaHCO_3$

a)

1

b)

2

c)

3

d)

4

23.

How many Hydrogen are in 4H₂O?

a)

6

b)

8

c)

2

d)

4

24.

Number of C's in 2Na₂CO₃

a)

1

b)

2

c)

3

d)

5

25.

How many Aluminum are in Al₂O₃?

a)

3

b)

2

c)

5

Counting Atoms Practice

Total questions: 25

Worksheet time: 13mins

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