Question

Name the following compounds. State if it is an ionic or covalent compound. State how many atoms of each element are represented by the formula.

a. FeCl3
b. P2S5
c. CaI2
d. Cr2(CO3)3

e. Au2S3

f. I4O9

Answer 1

Ans :

The name of the compounds depend on their chemical composition and the oxidation states of each element.

The electronegativity difference between the elements determine whether the compound is ionic or compound.

So here :

a) FeCl3 : Iron (III) chloride : Ionic compound

Each molecule of the compound has 1 atom of Fe and 3 atoms of Cl.

b) P2S5 : Diphosphorus (V) sulfide : Covalent

Each molecule of the compound has 2 atoms of P and five atoms of S.

c) CaI2 : Calcium iodide : Ionic compound

Each molecule of the compound has 1 atom of Ca and 2 atoms of I.

d) Cr2(CO3)3 : Chromium (III) carbonate : ionic compound

One molecule has 2 atoms of Cr , 3 atoms of C and 9 atoms of O.

e) Au2S3 : Gold (III) sulfide : ionic compound

Each molecule has 2 atoms of Au and 3 atoms of S.

f) I4O9 : Tetraiodine nonoxide : covalent compound

Each molecule has 4 atoms of Iodine and 9 atoms of oxygen