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A solution is a homogenous mixture.

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In ancient times these were referred to fire, earth, water, and air

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a hytrogeneous is a colorless element

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Examples of homogenous mixtures are sugar-water and salt-water.

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In  a compound atoms are hard to break because they are held together by chemical bonds.

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All elements found on Mars are there on Earth

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Hydrogen is the most common of these

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Carbondioxide is an example of a pure compound

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In a homogenous mixture, constituents present are uniformly mixed and have no arise of separation

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The properties are usually  different from the properties of the elements that they contain

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The properties are usually  different from the properties of the elements that they contain

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All metals react with oxygen and when saturated form hydroxides

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salt, water and sugar

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Some elements react with one-another

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they can only be seperated by a chemical reaction

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they can only be seperated by a chemical reaction

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Metals have high melting points and low freezing points

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Metals:
Magnesium
Iron
Zinc
Silver

Non-Metals:
Carbon
Sulfur
Oxygen
Nitrogen

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non-metals are dull and insulative

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Every one of these has its own unique atom.

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Arranged in the periodic table according to the atomic number. 1-118

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Metals are lustrous and conductive

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they can be divided into two types : Homogenous and hetrogenous

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94 are found naturally and 24 are artificially prepared in labs

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They are a combination of two or more substances that are not chemically combined.

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They are divided into 2 basic groups: metals and non-metals

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when two or more elements are chemically joined.

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Compounds contain two or more elements joined together.

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Substances  that all have a common atom.

For example: Hydrogen, Helium, Zinc, etc.