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Worksheets

Chemical Formulas

Total questions: 86

Worksheet time: 4hrs 18mins

Name
Class
Date
1.

Element or Compound?

H2O

a)

Element

b)

Compound

2.

Which of the following is a compound?

a)

Co

b)

O2

c)

C

d)

CO2

3.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

4.

How many magnesium (Mg) are in Mg3(PO4)2 ?

5.

How many phosphorus (P) are in Mg3(PO4)2 ?

6.

How many oxygen (O) are in Mg3(PO4)2 ?

7.

How many carbon (C) are in C2H4(OH)2 ?

8.

How many hydrogen (H) are in C2H4(OH)2 ?

9.

How many oxygen (O) are in C2H4(OH)2 ?

10.

How many aluminum (Al) are in Al2(S2O3)3 ?

11.

How many sulfer (S) are in Al2(S2O3)3 ?

12.

How many oxygen (O) are in Al2(S2O3)3 ?

13.

How many TOTAL atoms are in:

H2SO4

a)

6

b)

5

c)

7

d)

3

14.

CH4 is an example of a--

a)

chemical equation

b)

chemical formula

c)

chemical reaction

d)

chemical symbol

15.

How many different elements are present in the following chemical formula: CO2

a)

1

b)

2

c)

3

d)

4

16.

How many different elements are present in the following chemical formula: CoSO4

a)

1

b)

2

c)

3

d)

4

17.

How many Hydrogen atoms are present in glucose: C6H12O6

a)

6

b)

12

c)

24

d)

1

18.

How many Oxygen atoms are present in H2O?

a)

1

b)

2

c)

3

d)

4

19.

How many Sulfur atoms are in Cr(SO4)3?

a)

1

b)

3

c)

4

d)

12

20.

How many Oxygen atoms are in Cr(SO4)3?

a)

1

b)

3

c)

4

d)

12

21.

How many Chromium atoms are in Cr(SO4)3?

a)

1

b)

3

c)

4

d)

12

22.

Pb(NO3)2

Fill in the blanks with the number of atoms of each element.

Pb:

N:

O:

4 lines
23.

How many molecules of H2O are present in: 3H2O

a)

1

b)

2

c)

3

d)

4

24.

How many atoms of Hydrogen are present in: 3H2O

a)

9

b)

2

c)

3

d)

6

25.

How many atoms of Oxygen are present in: 3H2O

a)

9

b)

2

c)

3

d)

6

26.

Match the following

a)
1.

H2O4

b)
2.

H2O2

c)
3.

CH4

d)
4.

C2H4

e)
5.

2H2O

27.

How many atoms are in this chemical formula?

a)

7

b)

8

c)

3

d)

4

28.

How many elements are in this chemical formula?

a)

7

b)

8

c)

3

d)

4

29.

Coefficients in chemical formulas...

a)

Multiply just the first atom

b)

Add to the subscripts at the end of the molecule

c)

Multiply elements without subscripts

d)

Multiply EVERYTHING!

30.

How many phosphorus atoms are there?

a)

0

b)

1

c)

3

d)

4

31.

Which of these formulas contain equal numbers of nitrogen atoms?

a)

Formulas I and III

b)

Formulas I and IV

c)

Formulas I, II and V

d)

Formulas II and III

32.

How many atoms are represented in the reactants in the equation?

a)

6

b)

7

c)

4

d)

5

33.

How many elements are represented in the products in the equation?

a)

2

b)

3

c)

4

d)

5

34.

In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

a)

H3PO4

b)

H2SO4

c)

HCIO3

d)

H2O

35.

The chemical formula for sodium sulfate is Na2SO4. How many sulfur atoms are in the formula for sodium sulfate?

a)

1

b)

2

c)

6

d)

7

36.

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

a)

4

b)

6

c)

12

d)

24

37.

How many atoms in all are found in the compound above?

a)

3

b)

4

c)

5

d)

6

38.

Which of the models best represents CaCO3?

a)
b)
c)
d)
39.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

40.

What combination of beads should the use to model the formula? Blue represents carbon, green represent oxygen and red represent hydrogen.

a)

6 blue, 6 red and 6 green

b)

12 green, 6 red and 6 blue

c)

12 red, 6 blue and 6 green

d)

12 blue, 6 green and 6 red

41.

What is a molecule?

a)

two or more atoms bonded together.

b)

two or more atoms - of at least two different elements - bonded together

42.

What does the subscript 3 in this chemical formula mean?

a)

There are three separate oxygen atoms

b)

There are three oxygen molecules

c)

There are three oxygen atoms that are bonded together

43.

What does the 4 in this chemical formula mean?

a)

There are four hydrogen atoms in the molecule

b)

There are four water molecules

c)

There are four Hydrogen and four oxygen atoms in the molecule

44.

Is water a molecule, a compound, or both?

a)

Molecule

b)

Compound

c)

Both

45.

If molecules are like Legos, then....

a)

each individual Lego represents an atom and what you build from the Legos represent molecules.

b)

each individual Lego represents molecules.

c)

each individual atom represents compounds.

46.

The 2 in this equation is a _______________.

a)

coefficient

b)

subscript

47.

The 4 in this equation is a _______________.

a)

coefficient

b)

subscript

48.

This picture is a citric acid molecule. It's what makes sour candies sour! Which of the following is the correct chemical formula for this molecule?

a)

C₆H₁₂O₆

b)

CH₄

c)

C₆H₈O₇

49.

Is citric acid (in the picture above) a molecule, a compound, or both?

a)

Molecule

b)

Compound

c)

Both

50.

A specific type of atom (like iron, oxygen, or gold) by itself is called an....

a)

element

b)

molecule

c)

compound

51.

True or False: The chemical symbols from the periodic table are used to write chemical formulas.

a)

True

b)

False

52.

What compound does the the chemical forumla C6H12O6 represent?

a)

Salt

b)

Glucose

c)

Hydrochloric Acid

d)

Rust

53.

Which of the following is the chemical formula for salt?

a)

H2O

b)

NaCl

c)

HCl

d)

SaLt

54.

What is the chemical formula for rust?

a)

Fe2O3

b)

Fe3O2

c)

FeO

d)

RuST

55.
What is Fe2O3
(rust) made up of?
a)
1 flourine, 2 einsteinium,
3 oxygen
b)
2 fluorine, 3 oxygen
c)
2 iron, 3 oxygen
d)
2 iron, 3 osmium
56.
What is C3H8 
(methane) made up of?
a)
1 carbon & 1 hydrogen
b)
3 carbons & 8 hydrogens
c)
8 carbons & 3 hydrogen
d)
11 carbons & 11 hydrogen
57.
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
58.
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
59.
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
60.

How many total atoms are in one molecule of Glucose (C6H12O6)

a)

1

b)

3

c)

12

d)

24

61.

How many total atoms are in one molecule of Ammonia (NH3)

a)

1

b)

2

c)

3

d)

4

62.

How many Carbon atoms are found in one molecule of Butane (C4H10)

a)

4

b)

14

c)

40

d)

410

63.

How many different elements are used to make Salt (NaCl)

a)

1

b)

2

c)

3

d)

4

64.

How many different elements are used to make Calcium Carbonate (CaCO3)

a)

3

b)

4

c)

5

d)

6

65.

Which chemical formula below represents a molecule made up of 1 carbon atom and 2 oxygen atoms?

a)

CO

b)

C2O

c)

CO2

d)

C2O2

66.

Which of the following chemical formulas represents a molecule made of 1 potassium, 1 nitrogen, and 3 oxygen atoms?

a)

KNO3

b)

PNO3

c)

PNo3

d)

KNo3

67.

How many hydrogen atoms are there?

a)

1

b)

4

c)

5

d)

6

68.

How many nitrogen atoms are there?

a)

4

b)

8

c)

10

d)

20

69.

How many phosphorus atoms are there?

a)

0

b)

1

c)

3

d)

4

70.

How many molecules of methane are there?

a)

0

b)

1

c)

2

d)

4

71.

How many atoms of carbon are there?

a)

0

b)

1

c)

2

d)

3

72.

How many atoms are there total?

a)

0

b)

1

c)

4

d)

6

73.

How many atoms of hydrogen are there?

a)

2

b)

4

c)

6

d)

11

74.

How many different kinds of elements are there?

a)

4

b)

3

c)

2

d)

1

75.

How many molecules of caffeine are there?

a)

2

b)

5

c)

10

d)

24

76.

How many different kinds of elements are there?

a)

1

b)

3

c)

5

d)

8

77.

How many carbon atoms are there?

a)

2

b)

3

c)

8

d)

16

78.

How many atoms of oxygen are there?

a)

4

b)

3

c)

2

d)

1

79.

How many molecules of fungicide are there?

a)

6

b)

4

c)

3

d)

1

80.

How many different kinds of elements are there?

a)

3

b)

4

c)

5

d)

6

81.

How many atoms of oxygen are there?

a)

0

b)

1

c)

2

d)

3

82.

How many total atoms are there?

a)

8

b)

5

c)

3

d)

1

83.
Element or compound?
H2O
a)
element
b)
compound
84.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
85.
This appears on the left side of a chemical formula, and represents how many molecules there are.
a)
an atom
b)
the subscript
c)
a molecule
d)
the coefficient
86.
This is used to represent the number of each atom being represented for an element.
a)
an exponent
b)
the coefficient
c)
a molecule
d)
the subscript

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