wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

simple chemical formulas

Total questions: 80

Worksheet time: 3hrs 44mins

Name
Class
Date
1.
The _______ describes the atoms in a compound.
a)
chemical equation
b)
chemical formula
c)
chemical symbol
d)
coefficient
2.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
3.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
4.
Element or compound?
H2O
a)
element
b)
compound
5.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
6.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
7.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
8.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
9.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
10.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
11.
In this image, the symbols to the right of the arrow (in black) are called the_______.
a)
Products
b)
Reactants
c)
Subscripts
d)
Coefficients
12.
Na + MgF2 -->  NaF + Mg
What are the reactants?
a)
Na + MgF2
b)
Na
c)
NaF + Mg
d)
NaF
13.
NH3 ---> N2 + H2
What are the products?
a)
N2 + H2
b)
N2
c)
H2
d)
NH3
14.
All of the following are chemical changes except
a)
iron rusting
b)
water evaporating
c)
wood burning
d)
food rotting
15.

How many hydrogen atoms are there?

a)

1

b)

4

c)

5

d)

6

16.

How many nitrogen atoms are there?

a)

4

b)

8

c)

10

d)

20

17.

How many phosphorus atoms are there?

a)

0

b)

1

c)

3

d)

4

18.

How many molecules of methane are there?

a)

0

b)

1

c)

2

d)

4

19.

How many atoms of carbon are there?

a)

0

b)

1

c)

2

d)

3

20.

CH4 is an example of a —

a)

chemical equation

b)

chemical formula

c)

chemical reaction

d)

chemical symbol

21.
What is HCl
(hydrochloric acid) made up of?
a)
1 hydrogen, 1 carbon,  1 Iodine
b)
1 hydrogen & 2 carbons
c)
1 hydrogen & 1 chlorine
d)
1 hydrogen & 2 chlorine
22.
What is H2SO4 
(Sulfuric Acid) made up of?
a)
2 hydrogen, 1 sulfur, 4 oxygen
b)
1 hydrogen, 2 sulfur, 4 oxygen
c)
2 hydrogen & 4 sodium
d)
1 hydrogen & 6 sodium
23.
What is NaHCO3 
(Baking Soda) made up of?
a)
1 sodium, 1 hydrogen,
1 carbon, 3 oxygen
b)
1 sodium, 1 hydrogen, 3 cobalt
c)
1 nitrogen, 1 hydrogen, 3 cobalt
d)
1 nitrogen, 1 hydrogen, 3 cobalt
24.

Which of the following is the chemical formula for salt?

a)

H2O

b)

NaCl

c)

HCl

d)

SaLt

25.

Which of the following is not a compound?

a)

HCl

b)

Cl

c)

NaCl

d)

CO2

26.
Water, H2O, can be classified as.....
a)
Element
b)
Compound
c)
Heterogeneous Mixture
d)
Homogeneous Mixture
27.
How many elements are represented in the compound?
Na2CO3
a)
1
b)
2
c)
3
d)
4
28.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
29.
The one or two letters used to represent elements 
a)
Yield sign
b)
Coefficient
c)
Symbol
d)
Subscript
30.

How many Oxygen atoms are in this formula: H2SO4

a)

2

b)

3

c)

4

31.

Which of the following statements accurately describes the number of atoms in a molecule of ammonia (NH3)?

a)

Three atoms of nitrogen and three atoms of hydrogen

b)

One atom of nitrogen and three atoms of hydrogen

c)

Three atoms of nitrogen and one atom of hydrogen

d)

One atom of nitrogen and one atom of hydrogen

32.

Which of the following chemical formulas contains exactly 4 hydrogen atoms?

a)

CH3COONa

b)

NH4OH

c)

CH3CH2Cl

d)

CH3CHO

33.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
34.
What carries no charge 
a)
Neutrons
b)
Electrons
c)
Protons
35.

How many atoms of sulfur are in each molecule of H2SO4?

a)

1

b)

4

c)

2

d)

7

36.

Alanine is an amino acid with formula C3H7NO2. How many atoms in all are in each molecule of alanine?

a)

3

b)

7

c)

12

d)

13

37.

How many atoms of carbon are in a molecule of vinyl chloride (C2H3Cl)?

a)

1

b)

3

c)

6

d)

2

38.

How many atoms of hydrogen are in a molecule of glucose (C6H12O6)?

a)

12

b)

6

c)

18

d)

4

39.

Which of the following statements accurately describes the number of atoms in a molecule of ammonia (NH3)?

a)

Three atoms of nitrogen and three atoms of hydrogen

b)

One atom of nitrogen and three atoms of hydrogen

c)

Three atoms of nitrogen and one atom of hydrogen

d)

One atom of nitrogen and one atom of hydrogen

40.

Which of the following accurately describes the chemical formula of the molecule shown above?

a)

3CH8O

b)

C3H7O

c)

C4H8O2

d)

C3H8O

41.

Which of the following molecules has the formula CH2O?

a)
b)
c)
d)
42.

A diagram to a molecule is shown above. Based on the diagram, what is the identity of this compound?

a)

Water (H2O)

b)

Hydronium (H3O+)

c)

Hydrogen peroxide (H2O2)

d)

Hydroxide (OH-)

43.

Which elements are in the formula shown above?

a)

Tin and Chlorine

b)

Tin, Carbon and Lithium

c)

Sulfur, Nitrogen and Chlorine

d)

Sulfur, Nitrogen, Carbon and Lithium

44.

Which elements are in the formula shown above?

a)

Antimony only

b)

Carbon and Sulfur

c)

Cesium only

d)

Carbon and Silicon

45.

Which elements are in the formula shown above?

a)

Cobalt only

b)

Carbon and Oxygen

c)

Copper only

d)

Carbon and Osmium

46.

How many different elements are in an amino acid with the formula C5H11NO2S?

a)

5

b)

20

c)

18

d)

4

47.

Which of the following formulas would be used to describe molecule 4?

a)

C3HO

b)

C4HO

c)

CH4O

d)

CH3O

48.

Based on the diagram of molecule 5, what is the identity of the compound?

a)

Hydrogen peroxide (H2O2)

b)

Hydronium (H3O+)

c)

Hydroxide (OH-)

d)

Water (H2O)

49.

Based on the diagrams, which compound should be identified as methane (CH4)?

a)

Molecule 1

b)

Molecule 3

c)

Molecule 4

d)

Molecule 6

50.

How many atoms of carbon are in the formula CH3CH2CH2OH?

a)

3

b)

1

c)

7

d)

4

51.

How many atoms of hydrogen are in the formula CH3CH2Br?

a)

5

b)

3

c)

2

d)

7

52.

How many different elements are in the formula CH3CH2Br?

a)

3

b)

5

c)

6

d)

2

53.

How many atoms of oxygen are in the formula HOOCCOOH?

a)

2

b)

4

c)

8

d)

1

54.

Which of the following chemical formulas contains exactly 4 hydrogen atoms?

a)

CH3COONa

b)

NH4OH

c)

CH3CH2Cl

d)

CH3CHO

55.

Magnesium Nitrate

a)

Mg(NO3)2

b)

Mg (NO3)3

c)

Mg (NO3)

56.

Calcium Hydroxide

a)

Ca(OH)

b)

CaH2

c)

Ca(OH)2

57.

Barium Chloride

a)

BaCL2

b)

BaCl2

c)

BaCl

58.

Na2SO4

a)

Sodium Sulphate

b)

Sodium Sulphite

c)

Sodium Sulphide

59.

CaO

a)

Calcium oxalate

b)

Carbondioxide

c)

Calcium Oxide

60.

Calcium Phosphate

a)

Ca2(PO4)2

b)

Ca3(PO4)2

c)

Ca2(PO4)2

61.

Zinc Oxide

a)

ZnO

b)

Zn2O2

c)

ZnO2

62.

What is the correct chemical formula for the compound pictured?

a)

H2

b)

H2O

c)

O2

d)

H2O2

63.

The basic unit of an element is called ___

a)

atom

b)

element

c)

proton

d)

product

64.

____ is a substance that can't be broken down. It's made of one kind of atom.

a)

atom

b)

element

c)

mixture

d)

product

65.

Which of the models best represents CaCO3?

a)
b)
c)
d)
66.
What is the formula for magnesium chloride?
a)
MgCl
b)
Mg2Cl
c)
MgCl2
d)
Mg(ClO3)2
67.
The chemical formula of magnesium hydroxide is
a)
MgOH₂
b)
Mg(OH)₂
c)
Mg(OH)
d)
MgH₂
68.
The chemical formula of Iron (III)bromide is
a)
FeBr
b)
Fe(III)Br
c)
FeBr₃
d)
Fe₂Br₃
69.
The chemical compound for sodium phosphate would be:
a)
NaPO4
b)
Na2PO4
c)
Na3PO4
d)
Na(PO4)3
70.
Metals tend to _____ electrons to form _______; nonmetals tend to _____ electrons to form ________.
a)
lose, cations ;   lose, anions
b)
gain, cations ;    lose, anions
c)
gain, anions ;    gain, cations
d)
lose, cations ;     gain, anions
71.
Ionic compounds generally form when ____________ and ________________ react with each other.
a)
nonmetals and nonmetals
b)
metals and metals
c)
metals and nonmetals
d)
polyatomic elements & nonmetals
72.
What is the formula for manganese(III) oxide?
a)
MgO
b)
Mg2O3
c)
MnO
d)
Mn2O3
73.
When naming ionic compounds with transition metals you need to include roman numerals to show the _____ of the metal..
a)
atomic number
b)
mass number
c)
charge
d)
ionization energy
74.
Fe(NO3)2
a)
iron nitrate
b)
iron dinitrate
c)
iron(II) nitrate
d)
iron(I) nitrate
75.
Fe+3 combines with S-2 to form 
a)
Fe+4(S)=3
b)
Fe2S4
c)
Fe2S3
d)
Fe3S2
76.
The name of Cu₃N₂ is
a)
copper (III) nitride
b)
copper (II) nitride
c)
copper nitride
d)
tricopper dinitride
77.
The formula for copper (II) hydroxide is
a)
Cu(II)OH
b)
Cu(OH)2
c)
Cu2OH
d)
CuOH2
78.

Lead (II) Nitrate

a)

PB(NO3)2

b)

Pb(NO3)2

c)

Pb(NO3)

79.

What is the chemical name for Cr(NO2)3?

a)

chromium nitrite

b)

chromium nitride

c)

chromium III nitride

d)

chromium III nitrite

80.

Iron (III) nitride = Fe3N2

a)

CORRECT

b)

INCORRECT

Similar Resources on Wayground

8th Grade Science LEAP Study Questions

79 questions

8th Grade Science LEAP Study Questions

quiz

Worksheet

•

8th Grade

End of Year Review

80 questions

End of Year Review

quiz

Worksheet

•

10th Grade

Physical Science Exam Review

80 questions

Physical Science Exam Review

quiz

Worksheet

•

10th Grade

Thermal, Heat and Mechanical Energy Revision

85 questions

Thermal, Heat and Mechanical Energy Revision

quiz

Worksheet

•

9th Grade

FINAL Review 2025

75 questions

FINAL Review 2025

quiz

Worksheet

•

10th Grade

Precips/Net ionic

85 questions

Precips/Net ionic

quiz

Worksheet

•

9th - 12th Grade

Geologic Time & Formation of Earth Review

76 questions

Geologic Time & Formation of Earth Review

quiz

Worksheet

•

9th Grade

EMS Vocabulary Quiz Part 2 (5.1-5.6)

80 questions

EMS Vocabulary Quiz Part 2 (5.1-5.6)

quiz

Worksheet

•

8th Grade