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Atoms, Elements, Molecules, and Compounds
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H
2
O
How many atoms are there?
?
1
?
2
?
3
?
4
?
5
?
6
H
2
O
How many molecules are there?
?
1
?
2
?
3
?
4
?
5
?
6
H
2
O
How many compounds are there?
?
1
?
2
?
3
?
4
?
5
?
6
H
2
O
How many elements are there?
?
1
?
2
?
3
?
4
?
5
?
6
H
2
O
CO
2
How many molecules are there?
?
1
?
2
?
3
?
4
?
5
?
6
H
2
O
CO
2
How many atoms are there?
?
1
?
2
?
3
?
4
?
5
?
6
H
2
O
CO
2
How many compounds are there?
?
1
?
2
?
3
?
4
?
5
?
6
H
2
O
CO
2
How many elements are there?
?
1
?
2
?
3
?
4
?
5
?
6
H
2
O
CO
2
H
2
O
How many molecules are there?
?
1
?
2
?
3
?
4
?
5
?
6
H
2
O
CO
2
H
2
O
How many elements are there?
?
1
?
2
?
3
?
4
?
5
?
6
H
2
O
CO
2
H
2
O
How many compounds are there?
?
1
?
2
?
3
?
4
?
5
?
6
H
2
O
CO
2
H
2
O
How many atoms are there?
?
3
?
4
?
5
?
6
?
7
?
8
?
9
?
10
2H
2
O
How many molecules are there?
?
1
?
2
?
3
?
4
?
5
?
6
?
7
?
8
2H
2
O
How many elements are there?
?
1
?
2
?
3
?
4
?
5
?
6
?
7
?
8
2H
2
O
How many compounds are there?
?
1
?
2
?
3
?
4
?
5
?
6
?
7
?
8
2H
2
O
How many atoms are there?
?
1
?
2
?
3
?
4
?
5
?
6
?
7
?
8
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