This document discusses different properties used to classify and group materials. It describes how materials can be grouped based on similarities and differences in properties like appearance, solubility, transparency, and interactions with magnets. Specific properties discussed include metallic luster, hardness and softness, solubility, and transparency. Materials are classified as soluble, insoluble, miscible, immiscible, opaque, translucent, or transparent based on these various properties.

1. Different Kinds of Materials
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2. Material Grouping
 Material: - The matter of which an object is made is
called material. E.g. glass, steel, wood etc.
 Classification:- the process of sorting and grouping
things according to some basic is called classification.
Object can be classified on different basis. i.e. shape,
material used, uses etc.
 Basis of grouping:- Material can be grouped on the
basis of similarity and differences in their property.
Different types of material have different properties
such as appearance, solubility, transparency,
conductivity and behavior towards magnet etc.
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3. Material Properties
 Metallic lustre:- Some material have shine on them
called lustre. Material has lustre example gold, silver,
copper, while nonmetal has no lustre example gases,
sulphur.
 Hardness and softness:- Some material cannot be
compress and scratched easily and are hard example
iron and copper. Some material appears smooth on
touching. Example glass.
 Smooth and Rough surface: Material, which can be
pressed easily are called soft. While some other
material which cannot be pressed are called hard. For
example: cotton is soft, while wood is hard.
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4. Material Properties
 Solubility:
 Soluble:-Substances that are dissolved in water are called
soluble substance.
 Insoluble:-Substances that are not dissolved in water are
called insoluble substance.
 Miscible:-those liquid which mix well with water are said
to be miscible in water.
 Immiscible:-Substances which do not mix well with
water are called immiscible in water.
 Solubility of gases:-solubility of gases in water is very
less.
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5. Material Properties
 Transparency
 Opaque:-Materials through which we are not able to
see are called opaque e.g. wood, iron, gold.
 Translucent:-Materials through which things are only
partially visible are called translucent .e.g. Butter
paper, old glass door.
 Transparent:-Materials through which things can be
seen are called transparent. e.g. Glass, water, air.
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