Laws of stoichiometry: law of multiple proportions (Dalton’s law)

This kit enables to demonstrate the law of multiple proportions experimentally: the quantities of an element combining with a constant quantity of another element (to form different compounds) are determined by simple ratios expressed by low integers. This test enables to observe how an element can combine with another element to form different compounds: these compounds will have the same qualitative composition, but they will be combined according to different weight ratios. In this case, there are two types of copper chloride characterized by different chemical and physical properties. In the first case, the copper atom is bound with two chlorine atoms: the name will be copper(II) chloride; in the second case, the copper atom is bound with only one chlorine atom and its name will be copper(I) chloride. Thus it can easily be realized that the number of bonds that can be formed by an element depends on valency. In fact Dalton’s law emphasizes that an element can have different valencies.