Chemical and Physical Changes/Properties?

Physical Change: A physical change is a type of change in which the form of matter is altered but one substance is not transformed into another. Examples: An example of a physical change is crumpling a sheet or paper, breaking a pane of glass , evaporation of water into vapour, freezing water into ice, etc Physical Property: A physical property of a pure substance is anything that can be observed without changing the identity of the substance. Examples: Appearance, odour, particle size, melting point, boiling point, freezing point, thermal conductivity , refractive index electrical conductivity etc. Chemical Change: A chemical change is when something undergoes a "chemical reaction" and a new substance is formed as a result.

Examples Electrolysis of water, precipitation silver nitrate into silver chloride, precipitation of lime water to CaCO3 soln, oxidation ferrous chloride to ferric chloride, reduction of dichromate to chromium etc.

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