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Worksheets

Counting Atoms

Total questions: 46

Worksheet time: 23mins

Name
Class
Date
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.
2H2 + O2 ----> 2H2O What is the product?
a)
------>
b)
2H2O
c)
2H2+ O2
5.
2H2 + O2 --------> 2H2O What  are the reactants?
a)
----->
b)
2H2O
c)
2H2 +O2
6.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
7.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
8.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
9.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
10.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
11.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
12.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
13.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
14.
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
15.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
16.

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

17.

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

18.

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

19.

How many different elements are present in this molecule?

3 NH4C2H3O2

a)

15

b)

36

c)

5

d)

4

20.

The subatomic particles are called:

a)

protons, nucleus and electrons

b)

protons, electrons and neutrons

c)

protons, positives and negatives

d)

cloud, shell and quarks

21.

Electrons have a _____ charge.

a)

neutral

b)

negative

c)

positive

d)

both positive and negative

22.

What is the sum of an atom's protons and neutrons called?

a)

atom

b)

atomic theory

c)

atomic mass

d)

atomic number

23.

The _____ is based on the number of protons in the nucleus of the atom.

a)

atomic structure

b)

periodic table of the elements

c)

atomic number

d)

atomic mass

24.

What subatomic particle is represented by this symbol (+):

a)

neutron

b)

proton

c)

electron

25.

What subatomic particle is represented by this charge (-):

a)

neutron

b)

proton

c)

electron

26.

The chemical formula is C4H10. How many hydrogen atoms are in one molecule of this?

a)

1

b)

4

c)

10

27.

There are three carbon atoms in one formula unit of K2CO3.

a)

true

b)

false

28.

How many molecules are represented by 2C6H12O6 ?

(a)  

29.

How many atoms are in one molecule of C12H22O11 ?

(a)  

30.

How many atoms/ions are in one formula unit of Zn(C2H3O2)2 ?

(a)  

31.
A molecule is made up of ____ or more atoms.
a)
1
b)
2
c)
3
d)
4
32.
How many protons are in this element?
a)
79
b)
196
c)
117
d)
Cannot be determined
33.

How many atoms of Hydrogen are in H2O

a)

1

b)

2

c)

3

d)

more than 3

34.

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

a)

1

b)

2

c)

3

d)

4

35.

How many atoms of Hydrogen are in this compound?

a)

1

b)

2

c)

3

d)

4

36.

How many Hydrogen atoms in 3(NH₄)₂CrO₄?

a)

4

b)

2

c)

8

d)

24

37.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
38.

How many Nitrogen atoms are in the in H2C3O4N5?

a)

2

b)

3

c)

4

d)

5

39.

How many of a type of atom are present if there is no subscript following the element symbol? For example, like the Mg in the compound MgCl2MgCl_2  

a)

0

b)

2

c)

only 1

d)

1 million

40.
How many atoms of Oxygen are in Fe(NO3)3 ?
a)
6
b)
3
c)
9
d)
1
41.

How many total POTASSIUM atoms are in this formula?

a)

8

b)

2

c)

4

d)

12

42.

How many CARBONs are in this formula?

a)

1

b)

4

c)

8

d)

12

43.

Which formulas have the same number of HYDROGENs?

a)
b)
c)
d)
44.

Which formula has the most number of HYDROGENs?

a)
b)
c)
d)
45.

How many CARBON are in this formula?

a)

5

b)

2

c)

10

d)

20

46.

How many PROTONS does this atom have?

a)

36

b)

18

c)

40

d)

1

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