Free Printable Counting Atoms in Chemical Compounds

1.

How many Hydrogen atoms are in 4H₂O?

a)

6

b)

8

c)

2

d)

4

2.

How many atoms are there TOTAL in H₂SO₄?

a)

6

b)

5

c)

7

d)

3

3.

A subscript is the small number below the element symbol that tells the number of _______ of that element.

a)

atoms

b)

valence electrons

c)

protons

d)

elements

4.

Which of the following is a compound?

a)

Co

b)

O₂

c)

C

d)

CO₂

5.

How many Nitrogen atoms are in the in H₂C₃O₄N₅?

a)

2

b)

3

c)

4

d)

5

6.

How many Aluminum atoms are in Al₂O₃?

a)

3

b)

2

c)

5

d)

1

7.

How many atoms are present if there is no subscript following the element symbol?

a)

0

b)

2

c)

only 1

d)

1 million

8.

TRUE OR FALSE:
Every compound is a molecule but not every molecule is a compound.

a)

TRUE

b)

FALSE

9.

How many ELEMENTS are in C₆H₁₂O₆?

a)

1

b)

12

c)

3

d)

6

10.

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

a)

Iron, Oxygen

b)

Francium, Europium, Oxygen

c)

Ferrium, Oxygen

d)

Berylium, Oxygen

11.

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

a)

2

b)

4

c)

3

12.

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

a)

4

b)

3

c)

2

d)

6

13.

Which of the following is a molecule of a compound?

a)

$H_2$

b)

$Cl_2$

c)

$H_2O$

d)

$F_2$

14.

Is this an element or a compound? $CaSO_4$

a)

Element

b)

Compound

15.

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

a)

18

b)

12

c)

25

d)

24

16.

How many Sodium (Na) are in 6NaCl?

a)

1

b)

12

c)

6

17.

What is a coefficient?

a)

The small number on the right of the chemical symbol.

b)

The large number to the left of a formula.

18.

A pure substance that cannot be broken down into simpler substances.

a)

element

b)

compound

c)

molecule

d)

carbon dioxide

19.

A capital letter or combination of a capital letter and a small letter that is used to represent an element is called a(n) ________

a)

Element symbol

b)

Element sign

c)

Atomic Number

d)

Atomic Mass

20.

The first letter of an element is always ...

a)

a lowercase letter

b)

a uppercase letter

c)

a number

d)

the letter H

21.

The second letter of an element is always a(n)...

a)

vowel

b)

uppercase letter

c)

consonant

d)

lowercase letter

22.

In a chemical formula, the coefficient tells you the number of ______________.

a)

atoms

b)

elements

c)

compounds

d)

molecules

23.

How many Magnesium are in 10MgCl₂?

a)

10

b)

5

c)

20

24.

How many total atoms are in the chemical compound 3MgCl₂?

a)

6

b)

9

c)

7

d)

3

25.

How many total atoms are in the chemical compound 4K₂CO₃?

a)

4

b)

20

c)

5

d)

24

26.

How many total atoms are in the chemical compound 3Na₂SO₄?

a)

22

b)

23

c)

21

d)

24

27.

How many molecules are in the chemical compound 4ZnSO₄?

a)

4

b)

2

c)

16

d)

24

28.

How many molecules are in the chemical compound 3N₄O₁₀?

a)

4

b)

10

c)

3

d)

42

29.

How many molecules are in the chemical compound 8Cl₂O?

a)

2

b)

8

c)

16

d)

24

30.

How many molecules are in the chemical compound 8Cl₂O?

a)

2

b)

8

c)

16

d)

24

Counting Atoms in Chemical Compounds

Total questions: 30

Worksheet time: 3hrs 30mins

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