Question

State law of constant properties. Give one example to illustrate this law.

Answer 1

The low of constant properties states that a pure chemical compound always contains same elements combined together in the same definite proportion by weight.

Example :- Proust worked with two samples of cupric carbonate. One is naturally occurring and other is prepared in lab.

He found that composition of elements present in two sample are same.

Cupric carbonate $Cu$ $C$ $O$

(in lab) $51.35$ $9.7$ $38.9$

(in nature) $51.35$ $9.7$ $38.9$