The Amazing World of Chemistry

What are the differences between "pure substances" and "mixtures"? To know this, we must first learn the characteristics of pure substances and mixtures.

• has only one composition
• has fixed or constant boiling and melting point
• appears to be homogenous
• the propeties of the substance are consistent throughout the sample
• cannot be separated into simpler substances by physical means
• classified as elements and compounds

Mixtures (Impure Substances)

• a physical combination of two or more substances which may vary in amount
• has variable composition
• the different components retain there own composition and properties
• can be separated into pure substances by physical means

Pure Substances vs. Mixtures

Pure Substances	Mixtures
has only one composition	composed of 2 or more substances physically combined
has constant melting/boiling point	has varying  melting/boiling point
has consistent properties	components retain own composition properties
can't be separated physically	can be separated physically