NCERT Class 6 Science Chapter 4: Sorting Material into Groups YouTube Lecture Handouts
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NCERT Class 6 Science Chapter 4: Sorting Material into Groups
Object Versus Material?
How to Objects Differ?
- Shape (round β ball, glass marble)
- Size
- Color
- Uses
- Material β glass, plastic, metal, wood, cotton, leather (plastic objects β pen, boxes, toys)
- Separate objects based on β made from paper/wood and not from it
- Object can be made of one material or more than one material
Properties of Material
Based on Appearance
- Wood versus iron, copper, aluminum
- Subjects might shine & appear shiny
- Sandpaper is used to rub & see the lustre (shine)
- Freshly cut/rubbed surfaces of some materials have shiny appearance i.e.. they have lustre.
- Lustre present in copper wire, aluminium sheet, medicine wrappers, iron nails, zinc pieces and magnesium ribbon (mainly metals)
- Without lustre are card board, piece of wood and chalk
- Other metals often lose their shine and appear dull, because of the action of air and moisture on them
Hardness
- Materials which can be compressed or scratched easily are called soft (cotton & sponge)
- Some other materials which are difficult to compress are called hard (iron)
Soluble/Insoluble
- Soluble β mix in water (water soluble) , some substances are oil soluble
- Insoluble β donΥt mix in water
- Chalk
- Saw dust
- Sugar
- Salt
- Sand
Float or Sink
- Leaves will float
- Stone will settle
Transparency
- Transparent β can see clearly - glass, water, plastic, air
- Translucent β can see but not clearly - wooden box, cardboard
- Opaque β cannot see - tracing paper, with presence of fats
- Materials are grouped together on the basis of similarities and differences in their properties.
- Things are grouped together for convenience and to study their properties.
β Mayank