Grade 9 Science Unit 1 Chemical Symbols And Formulas Page 2
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1
2
3?
In water, there are TWO hydrogen atoms and one atom of oxygen bonded together. In a
Chemical Formula, a subscript number indicates how many of each element is present.
For example, H
O tells us there are two hydrogens and one oxygen.
2
PRACTICE
Use the chemical formula to determine the number of each element in the chemical compound
Compound Name
Chemical Formula
Number of Each Element
Ammonia
NH
3
Sodium bicarbonate
NaHCO
3
Acetic Acid
C
H
O
2
4
2
(vinegar)
Sodium nitrate
NaNO
3
Acetylsalicylic acid
C
H
O
9
8
4
(aspirin)
Calcium carbonate
CaCO
3
(chalk)
Glucose (sugar)
C
H
O
6
12
6
Calcium phosphate
Ca
(PO
)
3
4
2
HOMEWORK
Page 41, #1-4 in Grade 9 Science
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