Slide 2:
♣ Before few people believed in atomic theory, which fates that
Atoms are the building block of all nonliving things ♣ 200 years later experiments show that the atomic theory
Is correct ♣ Compound is a pure substance that are made up of two or more
Atoms that join together ♣ What is the compound? How the compound react with other compounds?
All these questions led to the development of the most important three laws :
Slide 3:
1) LAW OF DEFINITE PROPORTION It states that two samples of the same compound are made of the same elements
In exactly the same proportion by mass regardless the sizes of the sources of the
Samples. South
America Arabian
Gulf Carbon Atom =
Slide 4:
NOTHING 2) LAW OF CONSERVATION OF MASS Mass can neither be created nor destroyed in any physical or chemical change.
In any chemical change, the mass of the reactants and products should be the same
Slide 5:
3) LAW OF MULTIPLE PROPORTION If two or more different compounds are made of the same elements, the ratio
Of the masses of the second element (which combines with a given mass of the
First element) is always a ratio of small whole numbers ( which means there are
No points). O and C : C o C o 2
Slide 6:
Two compounds that are made of nitrogen and oxygen found to have:
1st compound : 12g nitrogen and 16g oxygen
2nd compound : 12g nitrogen and 32g oxygen
What’s the formula of each chemical ? 1st compound :
2nd compound : NO NO2 Same, so 1 double, so 2
Slide 7:
The Five Principles Of Delton 1) all matter is composed of atoms 2) all atoms of the same element are identical 3) all atoms of different elements are different 4) atoms cannot be destroyed, subdivided, or created 5)Law of Multiple Proportions - In chemical reactions, atoms are
combined, separated, or rearranged in simple whole number ratios. Not always true Not always true
Slide 8:
What did Delton miss in his principles ? Atoms can be created, destroyed, and subdivided 2) Atoms of similar elements can join Done By
AHMAD AL ATTAR