Saturday, August 31, 2013

Physical and Chemical Changes

Changes around us

Physical and Chemical Changes
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Terms

Definitions

Physical Properties
  • A characteristic of a pure substance that can be observed without changing it into another substance, any characteristic of a material that you can observe without it changing the identity of the substances that make up the material.
  • Includes color, shape, mass, Length, Volume, and densty
Physical ChangesIn this change the properties of a substance change, but the identity of the substance does not.
Chemical PropertiesAny characteristic that gives a substance the ability to undergo a change that results in a new substance.
Chemical Changes
  • A change in the identity of a substance due to the chemical properties of that substance
  •  A new substance or substances are formed as a result of such a change.
  • Something that can't be reversed.
Difference Between Chemical and Physical Properties
  • A physical property is any aspect of substance that can be measured or perceived without changing it. 
  • A chemical property, on the other hand, can only be observed by changing a substance's chemical identity.

  • . A physical change is reversible, a chemical change is not. For example, the freezing of water would be a physical change because it can be reversed,
  • whereas the burning of wood is a chemical change - you can't 'unburn' it

Wednesday, April 10, 2013

Insectivorous plants ,Litchens and Cuscuta

Insect eating plants are called insectivorous plants. These plants capture insects to fulfill the requirement of Nitrogen. Example; pitcher plant and sundew plant.
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