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Counting Atoms/ Elements
Test Description: Use prior knowledge to count the number of atoms/ elements in each compound. Don't forget the rules about coefficients and subscripts.
Instructions: Answer all questions to get your test result.
1) Determine the number of atoms in the chemical formula- S
A
3
B
1
C
2
D
4
2) Determine the number of atoms in the chemical formula- O2
A
4
B
1
C
2
D
3
3) Determine the number of atoms in the chemical formula- H2O
A
1
B
4
C
3
D
2
4) Determine the number of atoms in the chemical formula- H2SO
A
1
B
4
C
2
D
3
5) Determine the number of atoms in the chemical formula- NaCl (sodium chloride)
A
2
B
4
C
1
D
3
6) Determine the number of atoms in the chemical formula- N2
A
2
B
4
C
3
D
1
7) Determine the number of atoms in the chemical formula- P4
A
3
B
1
C
4
D
2
8) Determine the number of atoms in the chemical formula- CH4
A
7
B
4
C
5
D
6
9) Determine the number of atoms in the chemical formula- CaBr2
A
2
B
3
C
5
D
4
10) Determine the number of atoms in the chemical formula - H2O2
A
5
B
2
C
4
D
3
11) Determine the number of elements in the chemical formula- O2
A
3
B
4
C
2
D
1
12) Determine the number of elements in the chemical formula- LiNO3
A
2
B
5
C
3
D
4
13) Determine the number of elements in the chemical formula- CaBr2
A
4
B
3
C
5
D
2
14) Determine the number of elements in the chemical formula- Na2SO4
A
2
B
4
C
3
D
5
15) Determine the number of elements in the chemical formula- P4
A
4
B
2
C
3
D
1
*select an answer for all questions
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