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CBSE Class 9 Answered

Mention any two differnces between physical and chemical changes. give one example of each.
Asked by Bachittar Singh | 14 Nov, 2013, 06:39: PM
answered-by-expert 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 Vaibhav Chavan | 18 Nov, 2013, 09:13: AM

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