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Give the names of the elements present in the following compounds.(a) Quick lime(b) Hydrogen bromide(c) Baking powder(d) Potassium sulphate.
The names of the elements present in the following compounds along with their formula are given below in a tabular form:
Compounds | Chemical Formula | Elements present in them |
(a) Quick lime | CaO | Calcium and Oxygen |
(b) Hydrogen bromide | HBr | Hydrogen and Bromine |
(c) Baking powder | NaHCO3 | Sodium, Hydrogen, Carbon and Oxygen |
(d) Potassium sulphate | K2SO4 | Potassium, Sulphur and Oxygen |
It indicates the elements that are present in the compound and the ratio of these elements in the compound.
In order to write a chemical formula, the following steps should be followed
Step 1- Write down the symbols of the elements/ions, which combine to form a molecule of the compound, side by side. (While writing the formula of a compound containing a metal and a non-metal, the symbol of the metal is written first followed by that of the non-metal.)
Step 2- Write the valency of each element /ion.
Step 3- Interchange the valencies of the elements /ions and write as the subscript. Write them close together and ignore ‘1’ to obtain the formula.
Step 4- The radical/polyatomic ions must be written in brackets before the subscript is written. In case the number of polyatomic ions is one, the bracket is not required. An example is shown below:
(a) Write the symbol. Ca PO4
(b) Write the valency of each element 2 3
(c) Interchange the valencies of the elements and write as the subscript. Ca3 ( PO4)2
(d) Write them close together to obtain the formula. Ca3(PO4)2
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