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elements and compounds

The law of multiple proportions states that when different compounds are formed by a combination of the same elements, different masses of one element combine with the same relative mass of the other element in whole number ratios.

Law of definite proportions

the law of define proportions states that in a elements, not depending in the amount of the element, ther will be always the same component in the elemets

percent by mass (%)=

mass of element/mass of compound

X 100

The perioodic table is organized into a grid of horizontal rows called periods, and vertical columns called groups. There are 103 elements in total, from wich 92 can be find in the nature, the other 11 are created artificialy

A compound is a combination of two or more elements. An element is a pure substance that cannot be separated into simpler substances by physical or chemical means

the difference between a compound and an element is that the compound is a combination and the element is a pure substance. Most of the matter in the univers exist as compound

Matter

Mixtures

Homogeneous

Heterogeneos

Pure substances

Compounds

Elements

Separating a compound, often requires external energy, such as heat or electricity