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1)
- K = element
- O 2 = Compound.
- NaCl = Compound
- Al = element
- Ca = element
- CaCl2 = Compound
- H2 = Compound
2)
- a. There are two different elements are combined to form sulphur dioxide. Element are sulphur and oxygen.
- b. there are two atoms of oxygen are combined with each sulphur.
3)
- a. hydrogen and oxygen are two elements are combined to form water.
- b. H2O tells that two atom of hydrogen are combined with one atom of Oxygen.
5)
- a. MgO - magnesium oxide
- b.NaCl - sodium chloride
- c. CaCl2 - calcium chloride
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