What is the diffrence between physcial and chemical change?

Asked by HIMAJA | 15th Aug, 2012, 07:24: PM

Expert Answer:

Chemical changes happen on the molecular level. During any chemical change a new substance is formed. Examples of chemical changes include combustion (burning), cooking an egg, rusting of an iron pan, and mixing hydrochloric acid and sodium hydroxide to make salt and water.
 
Physical changes are concerned with energy and states of matter. A physical change does not produce a new substance. Changes in state or phase (melting, freezing, vaporization, condensation, sublimation) are physical changes. Examples of physical changes include crushing a can, melting an ice cube, and breaking a bottle.

Answered by  | 15th Aug, 2012, 07:34: PM

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