Classification of matter

Chemistry

Aug-Dec 2008

OBJECTIVES
 You will identify the different kinds of matter

 You will distinguish between a mixture and a pure

substance; between an homogeneous andheterogenous mixture.

Aug-Dec 2008

MATTER

MIXTURES

PURE SUBSTANCES

HOMOGENEOUS

HETEROGENEOUS

ELEMENTS

COMPOUNDS

Aug-Dec 2008

MATTER

MIXTURES

PURE SUBSTANCES

They arecombinations of two or more different elements and/or compounds physically intermingled Its components retains its own properties

They are substances that can´t be separated into simpler ones byphysical means. Just chemical means in some cases. Its components don´t retain its properties. The composition of its components is constant

The composition may vary
They can be separated into itscomponents by physical means

Aug-Dec 2008

MATTER MIXTURES PURE SUBSTANCES

ELEMENTS

COMPOUNDS
Consists of atoms of two or more different elements bound together, can be broken down into asimpler substances (elements) by chemical means has properties that are different from its component elements, always contains the same ratio of its component atoms. (law of constant composition-Proust)Aug-Dec 2008

Consists of only one kind of atom, cannot be broken down into a simpler type of matter by either physical or chemical means, and can exist as either atoms (e.g. argon) or molecules(e.g., nitrogen).

CONCLUSIONS
MATTER PURE SUBSTANCES

MIXTURES

Sodium Chloride

ELEMENTS Nytrogen Fe Oxygen Hydrogen Argon Carbon

COMPOUNDS

Carbon dioxide

MATTER MIXTURES PURESUBSTANCES

HOMOGENEOUS

HETEROGENEOUS It has different regions or areas with different compositions and properties. Its various components aren´t evenly distributed. So you can distinguish itscomponents easily
Aug-Dec 2008

Its various components are evenly distributed. So you can´t distinguish its components easily

MATTER PURE SUBSTANCES

MIXTURES

HOMOGENEOUS

HETEROGENEOUS

Air...