Law of Chemical Combinations
Law of Conservation of Mass:
It states that matter can neither be created nor destroyed.
Law of Definite Proportions:
A given compound always contains exactly the same proportion of elements by weight.
Law of Multiple Proportions:
If two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in the ratio of small whole numbers.
Gay Lussac’s Law of Gaseous Volumes:
When gases combine or are produced in a chemical reaction they do so in a simple ratio by volume provided all gases are at same temperature and pressure.
Avogadro Law:
Equal volumes of gases at the same temperature and pressure should contain equal number of molecules.
Dalton's Atomic Theory:
- All substances are made up of tiny, indivisible particles called atoms.
- Atoms of the same element are identical in shape, size, mass and other properties.
- Atoms of different elements are different in all aspects.
- Atom is the smallest unit that takes part in chemical combinations.
- Atoms combine with each other in simple whole number ratios to form compound atoms called molecules.
- Atoms cannot be created, divided or destroyed during any chemical or physical change.
Study Material