Friday, March 6, 2009

A Physical Property is any aspect of an object or substance that can be measure or perceived without changing its identity.

Example: color, smell, freezing point, boiling point, infa-red spectrum

A Chemical Property is a property used to characterize materials in reactions that change their identity.

Examples: iron rusting, ferments, Conductivity, flammability, reactivity, 

Wednesday, March 4, 2009

Heterogeneous &Homogeneous

A heterogeneous mixture is a  mixture of two or more compounds.

Examples: mixtures of  sand and  water  (or) muddy  water,  conglomerate rock, salads, whip cream, toothpaste, styrofoam.

A homogeneous mixture has  the same uniform appearance  and composition throughout.

Examples: Air, Salty  water, Cereal &Milk, Pizza, Glue,  and Lotion.