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  • 19 August 2018

    NCERT STD 6 SCIENCE UNIT 4 SHORTING MATERIALS INTO GROUP UNIT TEST PDF

    Sorting Materials into Groups

    • All things are made of one or more materials.
        
    • Same things can be made from different types of materials. 
        
    • It may be man-made or naturally occurring. 
    • Materials occupy space.
    • Materials have mass.
    • Materials can be classified on the basis of many criteria. 
    • Materials can be classified on the basis of physical state; as solid, liquid and gas.

    Solid: Solid has definite shape and definite volume. Examples: Stones, wood, plastic, common salt, steel, ice, glass, etc.

    Liquid: Liquid has indefinite shape but definite volume. 
    Examples: Water, milk, oil, etc.
    Gas: Gas has indefinite shape and indefinite volume. 
    Examples: Oxygen, nitrogen, carbon dioxide, etc.
    OTHER CRITERIA FOR SORTING MATERIALS:
    Appearance: Different materials look different from each other. The appearance depends on colour, hardness, texture, and lustre.
    Hardness: hardness is another property of materials. Some materials are very hard while some are very soft.
    Hard- Material which are difficult to compress are called hard, e.g. diamond, stone, wood, steel, etc. Diamond is the hardest natural substance.
    Soft- Materials which can be compressed easily are called soft, e.g. chalk, cotton, rubber, etc.
    Solubility or insolubility:

    Soluble: Material which easily dissolves in water is called soluble, e.g. salt, sugar, alum, etc.

    Insoluble: Material which does not dissolve in water is called insoluble, e.g. sand, chalk, iron, etc.
    Note: Since water is considered as universal solvent, so solubility in water is taken as standard in most of the definitions; related to solubility.

    Transparency- The material which allows light to pass through it is called transparent, e.g. acrylic sheet, glass, water, air, etc.
    Opaque- The material which does not allow light to pass through it is called opaque, e.g. wood, iron, asbestos, etc.
    Translucent: The material through which light can pass partially is called translucent, e.g. butter paper, thin curtain, etc.
    Metals: Materials which are hard, have such luster and are good conductors of heat and electricity are called metals, e.g. iron, copper, gold, etc.
    Non-metal: Materials which are brittle, which don’t have luster and are bad conductors of heat and electricity are called non-metals, e.g. coal, chalk, rubber, soil, etc.
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