Category : 6th Class
Now let us understand some properties of matter.
Appearance: Some objects have shiny appearance called luster, whereas some materials have dull appearance. For example gold, silver, copper have shiny appearance whereas psiper, wood, rubber have dull appearance.
Hardness or Softness: The materials can be classified on the basis of hardness and softness. Candle, wax, rubber are the examples of soft materials whereas iron, diamond, glass are the examples of hard materials.
Solubility: Some materials are soluble in water whereas others are not. Sugar, common salt, washing soda, lemon juice are soluble in water whereas glass, plastic, iron, mustard oil, coconut oil are not soluble in water.
Density: Density is the mass per unit volume of a substance. The substances which sink in the water have higher density than water and the substances which do not sink in the water have lower density than water. Substances like iron, copper, aluminum, silver, gold and glass have higher density than water whereas wood, plastic, ice, oil and petrol have lower density than water.
Transparency: All the materials have been classified into three groups on the basis of transparency
Transparent: The materials through which light can pass are called are transparent materials. Example glass, water, air, alcohol etc.
Translucent: The materials through which light can pass partially are called translucent materials. Example Butter paper, ground-glass, tissue paper, muddy water etc.
Opaque: The materials through which light cannot pass are called opaque materials. Example metals, stones, books, woods etc.
Which one of the following materials is soluble in water?
(b) Washing soda
(d) Chalk powder
(e) None of these
Which one of the following statements is true?
Statement 1: Air is a transparent material
Statement 2: Wood is a opaque material
(a) Statement 1
(b) Statement 2
(c) Both statements are correct
(d) Both statements are incorrect
(e) None of these
All the objects around us are made up of matter.
The process of grouping objects according to shared characteristics is known as classification.
Metals have generally shiny appearance whereas non-metals have dull appearance.
The substances which sink in the water have higher density than water and the substances which do not sink in the water have lower density than water.
Light can pass through transparent materials..
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