in the study of science, it is very important to know that all solids are not the same, all liquids are not the same, and all gases are never the same. This is why the classification of matter is important.

every element is made up from atoms

they (atoms) are the smallest piece that can be in an element

you need to put millions of atoms together to get an element of about half millimeter in size

the atom is made up of Electrons, Protons and Neutrons

The center part is the nucleus.

some elements don't join up together with other atoms

it's called molecule when two or more atoms join together

when a different atom joins, it ceases to be an element, it is now a compound

molecules can be made up of two atoms of the same element, or can be made up more atoms of different elements

A compound is a substance made from two or more elements that have reacted chemically with each other

the elements in there can't be separated by physical means

all compounds are molecules, but not all molecules are compounds

compounds don't necessarily look like the elements that formed them

Compounds usually are a result of a chemical reaction or bond, this means that they are entirely new materials

is matter with definite chemical composition and distinct properties

it is characterized by a constant composition in terms of its molecules

this can be an element or a compound but not a mixture

also it can be matter that exists in its pure form

this can't be separated into components by physical separation techniques

Some of them, like water, can be broken down into elements by a chemical reaction

this is formed of little bits of one or more substances mixed together

the can be separated from each other by physical means

when a sample of matter has the same composition throughout

is one that does not have uniform properties and composition

Mixtures come in many forms and phases. Most of them can be separated,

this is the most common of separating solid from liquid

is used in food industry, to identify chemicals in food or drinks

is great for separate a mixture of a soluble solid into a solvent

the best method to separate liquid from a solution, the concept is like evaporation, but now the vapor is called condensation

this is the best for separating a solution of two miscible liquids