Writing Chemical Formula Worksheet With Answer Key - Spes Unica Page 12
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28Example 2 Calcium oxide
1. Ca
O
2
2
2. Ca
O
3. Ca
O
2
2
4. Ca
O
1
1
5. Ca O
2+
2-
6. Ca
O
Example 3 Barium chloride
1. Ba
Cl
2
1
2. Ba
Cl
3. Ba
Cl
1
2
4. (Not needed)
5. BaCl
2
2+
-
6. Ba
(Cl
)
2
Example 4 Iron(III) sulphide
1. Fe
S
3
2
2. Fe
S
3. Fe
S
2
3
4. (Not needed)
5. Fe
S
2
3
3+
2-
6. (Fe
)
(S
)
2
3
Example 5 Ammonium phosphate
1. (NH
) (PO
)
4
4
1
3
2. (NH
)
(PO
)
4
4
3. (NH
)
(PO
)
4
3
4
1
4. (Not needed)
5. (NH
)
(PO
)
4
3
4
+
3-
6. (NH
)
(PO
)
4
3
4
12
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