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Oil, gas and petrochemical process industries


    Physical and chemical changes

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    Talib Al_Munawri
    Director-General
    Director-General

    Posts : 337
    Join date : 2009-07-03
    Age : 30
    Location : Sultanate of Oman

    Physical and chemical changes

    Post by Talib Al_Munawri on Fri Sep 11, 2009 9:43 pm

    Physical and chemical changes



    Distinguish between three states of matter

    As we deal with observing things and describing them, it is important to
    realize that there is an important difference between a material and an object.

    Materials are the "stuff" aspect of things. Some of the qualities or properties
    of materials are color, phase, clarity, degree of homogeneity, density, hardness,
    and sometimes the texture and crystalline shape. Also important are the
    interactions with heat and cold and with other materials.


    Materials vs. Objects

    It is necessary to distinguish between materials and objects. Materials are the
    "stuff" aspect of things. Samples and objects are the "item"
    aspect of things.
    A few examples are: a pencil is an object--graphite, wood, paint, metal, and
    rubber are materials from which it is made. Another example is a cast iron skillet.

    The material is the cast iron and the object is the skillet, that it is round,
    ten inches across, and has a handle describes the skillet but not the cast iron..
    In dealing with materials, let's start with the simple appearance. One aspect of
    appearance that is extremely important to chemists is the state of matter
    or phase. State refers to whether the material is a solid, liquid, or gas.

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