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A simple and complex question. Matter is known as anything that takes space and has mass. Matter have a lot of variations, but to generalize a bit we can subdivide mass as:
-Visible                            -Liquid                   -nonvisible
-Solid
Fun Fact: Everything that you are touching, seeing, drinking breathing and yourself is mass.

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As normally all matter have properties that can be clasified in Physical and Chemical properties, but whats the diference between those properties. Well, physical properties can be observed without the matter changing into another type of matter, meanwhile chemical properties refer to the capacity of an object to change into something else.

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Matter contains tiny particles called atoms. Atoms are made of electrons, protons, neutrons, and a nucleus with the atoms information. These atoms can change under certain circumstances. The most obvious example is when an object is summitted to heat and it causes a reaction on its structure. When a object is made of only one kind of atom its called an element(coal, iron, diamond), but whenever it has more than one kind of atoms its an molecule(CO2, H2O, O2)

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This is hard to explain but i will try my best. Whenever two substances collide or combine it will cause a mixture that depending on the objects, temperature or amount will have diferent responses. As an example if you grab a cookie and place it on milk for 10 seconds the cookie will smooth but if you grab 1 cookie and do the same but for 1-3 minutes the cookie will be destroyed and break.

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Quick and fast: Theres 3 states that are solid, liquid, and gaseous and water can change to the 3 states without changing its main properties.