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Matter, Elements, Compounds, and Mixtures
Transcript of Matter, Elements, Compounds, and Mixtures
Every form of matter has 2 kinds of properties- physical properties and chemical properties. An element is a pure substance that cannot be broken down into any other substance by chemical or physical means. What is the world's smallest material of matter?
An Atom is the basic particle from which all elements are made.
If you kept tearing an element apart until it was the smallest possible, it would be an atom.
Different elements have different properties because of their atoms.
When atoms combine, it is because of a chemical bond, which is a force of attraction. In many cases many atioms combine to form a molecule. A compound is a pure substance made of 2 or more elements chemically combined in a set ratio.
When elements are chemically combined, they form compounds having properties that are different from those of uncombined elements.
Examples of compounds:
Silver Sulfide Ag2S (Tarnish
Table Sugar C12H22O11 (Carbon, Hydrogen, Oxygen) A mixture is made of two or more substances- elements, compounds, or both- that are chemically combined. Mixtures differ from compounds in two ways. Each substance in a mixture keeps its individual properties. Also, the parts of a mixture are not combined in a set ratio. In this kind of mixture, you can see the different parts of the mixture.
Like A hand full of mulch, you can see the different parts of a heterogeneous mixture.
Chex Mix In this kind of mixture, you cannot see the different parts.
Solutions are a homogeneous mixture, but it does not have to be liquid. It can be a solid.
Sugar Water (dissolved table sugar in a glass of water)
Air is a solution of Nitrogen gas and oxygen gas. Chemistry is the study of the properties of matter and how matter changes. Chemistry involves matter, elements, compounds, and mixtures A Substance is a single kind of matter that is pure, meaning it always has a specific makeup Even though air and plastic are matter, no one has to tell you they are different materials. Materials have different properties, they can be hard, soft, smooth, rough, flammable, non- flammable, any many others. Physical Properties A Physical property is characteristic of a pure substance that can be observed without changing it into another substance. Examples:
Water: freezes at zero degrees and changes to solid water- Ice. But it is still water, just in a solid form. Water melts at one degree. Water also boils and turns to steam at 100 degrees. Steam is a gas for of water, it is still water, just in a gas form. Chemical Properties A Chemical Property is a characteristic of a pure substance that describes its ability to change into another substance. Examples:
Flammability- how easy it burns
Ability to React- ex. How Iron turns to rust Unlike Physical Properties of matter, some changes cannot be observed. Elements are the simplest substances. There are over 100 elements known to man. Examples: Aluminum, Hydrogen, Oxygen, Nitrogen, Sulfur, Water, Boron End.