Classification of matter

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Classification of matter

• notes

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Pure substance

• has the same properties throughout because a
  substance has a fixed, uniform composition.

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Pure substances

• Elements
• Compounds

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Elements

• substance that cannot be broken down into simpler
  substances.
• fixed composition because it contains only one
  type of atom.

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Compound

• compound is a substance that is made from two or
  more simpler substances and can be broken down
  into those simpler substances.
• The simpler substances are either elements or
  other compounds.
• A compound always contains two or more elements
  joined in a fixed proportion

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Mixtures

• The properties of a mixture can vary because the
  composition of a mixture is not fixed.
• heterogeneous mixture
• homogeneous mixture

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Heterogeneous

• the parts of the mixture are noticeably different
  from one another.

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Homogeneous

• the substances are so evenly distributed that it
  is difficult to distinguish one substance in the
  mixture from another.

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• How are the two brands of mixed nuts alike?
• How are they different?

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solutions

• Homogenous mixture where the particles dissolve
  completely
• Often clear
• Do not reflect light (tyndal effect)
• Cannot filter out particles