JSS 1: WRITING CHEMICAL FORMULA (I)

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Write the chemical formula of the following compounds:
1. Carbon (II) oxide (Valency: C=2, O=2)
2. Carbon (IV) oxide: (Valency: C=4, O=2)
3. Sulphur (II) oxide: (Valency: S=2, O=2)
4. Sulphur (IV) oxide: (Valency: S=4, O=2)
5. Ammonia: (Valency: N=3, H=1)
6. Ammonium: (Valency: N=4, H=1)
7. Methane: (Valency: C=4, H=1)
8. Quicklime: (Valency: Ca=2, O=2)
9. Water: (Valency: H=1, O=2)
10. Hydrochloric acid: (Valency: H=1, Cl=1)

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