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Counting Atoms in Chemical Formulas

Total questions: 55

Worksheet time: 39mins

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.
How many atoms of Oxygen are in this compound?
a)
1
b)
2
c)
3
d)
4
17.
How many Oxygen are in H2O?
a)
1
b)
2
c)
0
d)
4
18.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
19.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
20.
The number of Na's in Na₂CO₃
a)
1
b)
2
c)
3
d)
6
21.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
22.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
23.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
24.

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

a)

1

b)

2

c)

3

d)

4

25.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
26.

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

27.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
28.

How many Chlorine atoms are in 3Cl2?

a)

2

b)

12

c)

6

d)

3

29.

Calculate the number of Oxygen atoms in CO2

a)

3

b)

1

c)

4

d)

2

30.

How many total atoms are in the compound CH4?

a)

5

b)

4

c)

6

d)

8

31.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
32.
What cannot be broken down into other substances?
a)
Compound
b)
Mixture
c)
Solids
d)
Element
33.
What is made up two or more elements that are chemically combined?
a)
Element
b)
Mixture
c)
Compound
d)
Solids
34.
Which of the following an element?
a)
Carbonic Acid
b)
Copper
c)
Iron and Copper
d)
Water
35.
How many elements are represented in the compound?
Na2CO3
a)
1
b)
2
c)
3
d)
4
36.
Is sugar (C12H22O11) an element or a compound?
a)
Element
b)
Compound
37.
Is water an element or a compound?
a)
Element
b)
Compound
38.
A compound consists of two or more elements bound together.
a)
True
b)
False
39.
Is Iron (Fe) an element or a compound?
a)
Element
b)
Compound
40.
Which of the following atomic symbols is written correctly?
a)
ee
b)
hE
c)
C
d)
CL
41.
Can be found on the periodic table
a)
Element
b)
Compound
c)
MIxture
42.
What is krypton?
a)
element
b)
compound
c)
mixture
43.
What is gold?
a)
element
b)
compound
c)
mixture
44.
What is sugar?
a)
element
b)
compound
c)
mixture
45.
What is water?
a)
element
b)
compound
c)
mixture
46.

What is the difference between Co and CO?

a)

CO is an element but Co is a compound

b)

Nothing is different. They are the same thing.

c)

CO is two elements and Co is only one element

d)

Co is not a pure substance

47.

Which is the best description of an element?

a)

A substance that cannot be broken down into simpler substances

b)

A collection of atoms that have different abilities when joined together

c)

A man-made mineral

d)

A mixture of substances

48.

Which one is a compound?

a)

Ni

b)

F

c)

Re

d)

NaCl

49.

How many different elements are in the compound?

a)

12

b)

3

c)

24

d)

6

50.

Which of the following is a compound:

a)

Carbon

b)

Water

c)

Oxygen

d)

Chlorine

51.

"Na" is the element's

a)

Chemical Formula

b)

Compound

c)

Name

d)

Chemical Symbol

52.

How many elements are in this compound?

a)

13

b)

6

c)

4

d)

3

53.

The place where known elements are represented...

a)

The Period Table

b)

Compounds

c)

Chemical Formula

d)

Graph

54.

One way to tell how many elements a compound has is to..

a)

the the square root of the total number of lettersThis is a wrong answer the the square root of the total number of letters

b)

count the capital letters

c)

add up all the numbers

d)

count the letters

55.

A substance that consists of 2 or more different elements is a

a)

element

b)

data table

c)

symbol

d)

compound

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