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Classifying Matter:Elements, Compounds, and

Mixtures

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Pure Substances

A sample of matter that has definite chemical and

physical properties. The composition never varies

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Elements

pure substance that cannot be separated into

simpler substance by physical or chemical

means.

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Compounds

Pure substance composed of two or more

different elements joined by chemical bonds.

Made of elements in a specific ratio

that is always the same

Has a chemical formula

Can only be separated by

chemical means, not physically

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Mixtures

A combination of two or more pure substances

that are not chemically combined.

substances held together byphysical forces, notchemical

No chemical change takes place

Each item retains its properties

in the mixture They can be separated physically

Chem4kids.com

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Mixtures vs. Compounds

http://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/elements_com_mix_6.shtml

http://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/elements_com_mix_6.shtmlhttp://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/elements_com_mix_6.shtml

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Can you identify the following?

You will be shown a series of photos. Tell if each

photo represents an item composed of an

element, compound, or mixture.

Review:

An elementcontains just one type of atom.

A compoundcontains two or more different

atoms joined together.

A mixturecontains two or more different

substances that are only physically joined

together, not chemically.

A mixture can contain both elements andcompounds.

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Element, Compound, or Mixture?

Rocks

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Element, Compound, or Mixture?

Rocks

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Element, Compound, or Mixture?

Copper

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Element, Compound, or Mixture?

Copper

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Element, Compound, or Mixture?

Jelly Beans

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Element, Compound, or Mixture?

Jelly Beans

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Element, Compound, or Mixture?

Table Sugar

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Element, Compound, or Mixture?

Table Sugar

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Element, Compound, or Mixture?

Diamond

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Element, Compound, or Mixture?

Diamond

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Element, Compound, or Mixture?

Tea

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Element, Compound, or Mixture?

Tea

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Element, Compound, or Mixture?

Salt

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Element, Compound, or Mixture?

Neon Gas

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Element, Compound, or Mixture?

Neon Gas

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Element, Compound, or Mixture?

Salad

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Element, Compound, or Mixture?

Salad

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Element, Compound, or Mixture?

Pure Water

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Element, Compound, or Mixture?

Pure Water

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Element, Compound, or Mixture?

Aluminum

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Element, Compound, or Mixture?

Lemonade

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Element, Compound, or Mixture?

Lemonade

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Element, Compound, or Mixture?

Silver

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Element, Compound, or Mixture?

Silver

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Element, Compound, or Mixture?

Sand

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Element, Compound, or Mixture?

Sand

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