Question

Give the formulae of the compounds formed from the following sets of elements (a)calcium and fluorine (b) hydrogen and sulphur (c) nitrogen and hydrogen (d) carbon and chlorine (e) sodium and oxygen (f) carbon and oxygen

Answer 1

a) Calcium fluoride Formula - CaF2
b) Hydrogen Sulphide Formula - H2S
c) Ammonia Formula - NH3
d) Carbon tetrachloride Formula - CCl4
e) Sodium oxide - Na2O
f) Carbon monoxide Formula - CO

Answer 2

Formula of the compounds formed from the following sets.

• To write the chemical formula of the compound, the symbol, as well as the valency of the element, must is written in such as manner that the symbol is at the top and the valency is at the bottom.
• When the valency and symbol of the elements are cross multiplied it gives the chemical formula.

(a) Calcium and Fluorine

Symbol of the elements:  Ca        F

Valency of the elements:  2          1

When cross multiplied it gives the formula as $CaF_2$

(b) hydrogen and sulfur

Symbol of the elements:  H        S

Valency of the elements:  1         2

When cross multiplied it gives the formula as $H_2S$

(c) nitrogen and hydrogen

Symbol of the elements:  N        H

Valency of the elements:  3         1

When cross multiplied it gives the formula as N$H_3$

(d) carbon and chlorine

Symbol of the elements:  C        Cl

Valency of the elements:  4        1

When cross multiplied it gives the formula as $CCl_4$

(e) sodium and oxygen

Symbol of the elements:  Na       O

Valency of the elements:  1         2

When cross multiplied it gives the formula as $Na_2O$

(f) carbon and oxygen

Symbol of the elements:  C        O

Valency of the elements:  4        2

As 2 is common it is reduced in both thus the formula of the compound  $CO_2$

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