MULTIMEDIA PRESENTATION THROUGH POWER POINT

PHYSICAL SCIENCE

WELCOME

UNIT: SOME BASIC

CONCEPTS OF CHEMISTRY

TOPIC: LAWS OF CHEMICAL

COMBINATIONS

LAW OF CONSERVATION OF MASS

In a chemical reaction the total mass of the reactants consumed is equal to the total mass of the products formed.

In other words, matter can neither be created nor be destroyed.

LAW OF DEFINITE PROPORTIONS

The same compound always contains the same elements combined together in the same fixed proportion by mass.

In other words , every compound has a fixed composition by weight.

LAW OF MULTIPLE PROPORTIONS

When two elements combine to form more than one compound, the different masses of one of the elements which combine with a fixed mass of the other bear a simple ratio to one another.

LAW OF RECIPROCAL PROPORTIONS

If an element A combines with an element B in the ratio x:y an combines with another element C in the ratio x:z , then if B and C are to combine, they do so in the ratio y:z or a simple multiple of it.

GAY-LUSSAC’S LAW OF GASEOUS VOLUMES

This law states that, when gases combine to form gaseous products, a simple ratio exist between the volumes of the reactants and the products at constant temperature and pressure.

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