Composition of matter
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Composition of Matter. Matter may be classified by its composition. Substances – matter that has a fixed composition. (pure) Matter can be an: Element – made up of atoms Compound – made up of elements Mixture – two or more substances mixed together. Chemical Changes. Elements  Compounds

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Composition of Matter

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Composition of matter

Composition of Matter

  • Matter may be classified by its composition.

  • Substances – matter that has a fixed composition. (pure)

  • Matter can be an:

    • Element – made up of atoms

    • Compound – made up of elements

    • Mixture – two or more substances mixed together


Chemical changes

Chemical Changes

  • Elements  Compounds

    • 2H2 + O2  2H20

  • Compounds  Element

    • Electricity + H2O  H2 + O2


Elements

Elements

  • Can not be broken down chemically

  • Found on the Periodic Table

  • First letter capitalized

    • CO  Carbon Monoxide (compound)

    • Co  Cobalt (element)

  • Latin PbPlumbum

  • Table S of Reference Table

    • Properties of Selected Elements


Compounds

Compounds

  • Two or more elements chemically combined.

  • Can be broken down chemically.

    • Heat or electricity

  • Have fixed composition.

    • H20 (2 Hydrogen, 1 Oxygen)

    • H20 by mass (11.1% Hydrogen, 88.9% Oxygen)


Compounds1

Compounds

  • Elements properties change in compounds.

    Na + Cl2 NaCl

    (explosive (poisonous (Good on

    in water) in water) french fries)


Compounds2

Compounds

  • Bonds hold atoms together to make a molecule.

  • Attractive forces between molecules determines phase.

    • Stronger bonds  liquids

    • Weaker bonds  gas


Mixtures

Mixtures

  • Two or more substances mixed together.

    • Not a substance

    • Composition can vary

      • (A little or a lot of salt in water makes salt water)


Homogeneous mixture

Homogeneous Mixture

  • Same throughout

  • Is in Solution – one thing dissolves in another

    • Salt + Water

    • Sugar + Water


Heterogeneous mixture

Heterogeneous Mixture

  • Not uniform, clumpy

    • Doesn’t dissolve

    • Orange juice

    • Mud puddle


Learning check

Learning Check

  • Hydrogen Peroxide

    • Compound

  • Air

    • Homogeneous Mixture

  • Salad Dressing

    • Heterogeneous Mixture

  • Dirt

    • Heterogeneous Mixture

  • Gold

    • Element

  • Wild Bird Seed

    • Heterogeneous Mixture

  • Carbon Dioxide

    • Compound

  • Coffee

    • Homogeneous Mixture


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