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WorksheetsCounting Atoms
Total questions: 28
Worksheet time: 34mins
Name
Class
Date
1.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5
2.
The number of Na's in Na₂CO₃
a)
1
b)
2
c)
3
d)
6
3.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
4.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
5.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
6.
How many Chlorine are in MgCl2?
a)
2
b)
1
c)
3
7.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
8.
How many Nitrogen are in 2AlN?
a)
4
b)
5
c)
1
d)
2
9.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
10.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
11.
How many atoms of Hydrogen are in this compound
a)
1
b)
2
c)
3
d)
4
12.
How many atoms of Oxygen are in this compound?
a)
1
b)
2
c)
3
d)
4
13.
How many atoms of Oxygen are in this compound?
a)
1
b)
2
c)
3
d)
4
14.
How many TOTAL atoms are in this compound?
H2C3O4N5
H2C3O4N5
a)
5
b)
14
c)
15
d)
19
15.
a capital letter or combination of a capital letter and a small letter that is used to represent an element is called a(n) ________
a)
chemical symbol
b)
element sign
16.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
17.
How many Oxygen atoms are in H2O?
a)
1
b)
2
c)
0
d)
4
18.
How many Hydrogen atoms are in 4H2O?
a)
6
b)
8
c)
2
d)
4
19.
How many Magnesium atoms are in 10MgCl2?
a)
10
b)
5
c)
20
20.
How many Sodium atoms are in 6NaCl?
a)
1
b)
12
c)
6
21.
How many Nitrogen atoms are in (NH₄)₂CrO₄?
a)
1
b)
2
c)
8
d)
16
22.
Is the following equation balanced or unbalanced ?
N2 +3 H2 --> 2NH3
N2 +3 H2 --> 2NH3
a)
Balanced
b)
Unbalanced
23.
Is the following equation balanced or unbalanced ?
Al + O2 --> Al2O3
Al + O2 --> Al2O3
a)
Balanced
b)
Unbalanced
24.
Is the following equation balanced or unbalanced ?
N2 +3 H2 --> 2NH3
N2 +3 H2 --> 2NH3
a)
Balanced
b)
Unbalanced
25.
Is the following equation balanced or unbalanced ?
Al + O2 --> Al2O3
Al + O2 --> Al2O3
a)
Balanced
b)
Unbalanced
26.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
27.
Is this balanced?
Al + O2 → 2Al2O3
Al + O2 → 2Al2O3
a)
Yes
b)
No
28.
Which of the following is an unbalanced equation?
a)
CaCO3 --> CaO + CO3
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 2O2 --> CO2 + 2SO2
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