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Counting Atoms

Total questions: 40

Worksheet time: 40mins

Name
Class
Date
1.

How many atoms of Iron are in this compound?

a)

1

b)

2

c)

3

d)

4

2.

How man atoms of carbon are there?

a)

1

b)

2

c)

3

d)

4

3.

How many different elements are present in H2COCH2

a)

5

b)

4

c)

3

d)

2

4.

Calculate the number of Oxygen atoms in Al(OH)3

a)

1

b)

2

c)

3

d)

4

5.

How many elements are in this chemical formula? NaHCO3NaHCO_3  

a)

1

b)

2

c)

3

d)

4

6.

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!

7.

C3H5(NO3)3

a)

C = 3, H = 5, N = 3, O = 9

b)

C = 3, H = 5, N = 1, O = 9

c)

C = 9, H = 15, N = 3, O = 9

d)

C = 9, H = 15, N = 1, O = 3

8.

How many atoms of hydrogen are in this compound?

a)

1

b)

2

c)

3

d)

4

9.

Select the chemical formula for this molecule?

a)

B1F3

b)

BF

c)

BF3

d)

FB

10.

What is the chemical formula for this molecule?

a)

H1F2

b)

H1F1

c)

HF

d)

HeF

11.

What is the chemical formula for this molecule?

a)

N2He4

b)

NeH3

c)

N2H4

d)

N2H2

12.

4CF2Cl2

a)

C = 4, F = 4, Cl = 2

b)

C = 1, F = 8, Cl = 8

c)

C = 4, F = 8, Cl = 8

d)

C = 1, F = 4, Cl = 8

13.

C3H5(NO3)3

a)

C = 3, H = 5, N = 3, O = 9

b)

C = 3, H = 5, N = 1, O = 9

c)

C = 9, H = 15, N = 3, O = 9

d)

C = 9, H = 15, N = 1, O = 3

14.

H2SO4

a)

H = 2, S = 4, O = 4

b)

H = 2, S = 1, O = 4

c)

H = 8, S = 4, O = 4

d)

H = 2, SO = 4

15.

How many different elements are present in this molecule?

3 NH4C2H3O2

a)

15

b)

36

c)

5

d)

4

16.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
17.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
18.
2H2 + O2 ----> 2H2O What is the product?
a)
------>
b)
2H2O
c)
2H2+ O2
19.
2H2 + O2 --------> 2H2O What  are the reactants?
a)
----->
b)
2H2O
c)
2H2 +O2
20.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
21.

How many atoms of Iron are in this compound?

a)

1

b)

2

c)

3

d)

4

22.

Draw the compound: H3O

23.

Match the following

a)

Compound with 2 Elements

1.

HF

b)

Compound with 3 Elements

2.

H₂SO₄

c)

Compound with 5 Elements

3.

H₂FO₄HKL

d)

Element

4.

H₂

e)

Free

5.

Free

24.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
d)

atom

25.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
d)

atom

26.

Elements

a)

are made of two or more types of atoms chemically bonded together

b)

are made of one type of atom

c)

are made of two or more types of molecules combined in the same space

d)

are always individual atoms

27.

Which of the following are examples of ELEMENTS?

a)

Oxygen

b)

Water

c)

F2

d)

Lemonade

e)

Sulfur Dioxide (SO2)

28.

Provided is a list of five different substances. How many of these substances are elements?

a)

2

b)

3

c)

4

d)

5

29.

How many elements are in the compound Fe2O3?

a)

0

b)

1

c)

2

d)

3

30.

Salt (NaCl)

a)

Compound

b)

Element

c)

Mixture

31.

What is the total number of atoms present in one unit of chromium(III) sulfate, Cr2(SO4)3?

a)

3

b)

7

c)

15

d)

17

32.

Diagram A is an example of a(n)

a)

Diatomic Element

b)

compound

c)

mixture

d)

Monatomic Element

33.

Diagram B is an example of a(n)

a)

Diatomic element

b)

compound

c)

mixture

d)

Monatomic Element

34.

Diagram C is an example of a(n)

a)

element

b)

compound

c)

mixture

35.
Classify the picture with the correct label.
a)
Element
b)
Compound
c)
Mixture of Elements and Compounds
d)
Mixture of Elements
e)

Mixture of Compounds

36.

What is the correct FORMULA for this sample? B=Black sphere; W=White sphere

a)

9W14B

b)

14B + 9W

c)

23 BW

d)

W9 + B14

e)

None of these

37.
Classify the picture with the correct label.
a)
Element
b)
Compound
c)
Mixture of Compounds
d)
Mixture of Elements
38.
Classify the picture with the correct label.
a)
Compounds
b)
Mixture of Elements
c)
Mixture of Compounds
d)
Mixture of Elements & Compounds
39.

The positively charged particle in an atom.

a)

Proton

b)

Neutron

c)

Electron

d)

Nucleus

40.

The center of an atom where its neutrons and protons are is called the _____________.

a)

nucleus

b)

electron cloud

c)

center

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