NCERT Class 6 Science Chapter 4: Sorting Material into Groups Youtube Lecture Handouts

Download PDF of This Page (Size: 252K)

Get video tutorial on: https://www.youtube.com/c/Examrace

Watch video lecture on YouTube: NCERT Class 6 Science Chapter 4: Sorting Material into Groups NCERT Class 6 Science Chapter 4: Sorting Material into Groups
Loading Video

Object Versus Material?

How to Objects Differ?

  • Shape (round – ball, glass marble)

  • Size

  • Color

  • Uses

  • Material – glass, plastic, metal, wood, cotton, leather (plastic objects – pen, boxes, toys)

  • Separate objects based on – 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 – mix in water (water soluble), some substances are oil soluble

  • Insoluble – don’t mix in water

  • Chalk

  • Saw dust

  • Sugar

  • Salt

  • Sand

Float or Sink

  • Leaves will float

  • Stone will settle

Transparency

  • Transparent – can see clearly - glass, water, plastic, air

  • Translucent – can see but not clearly - wooden box, cardboard

  • Opaque – cannot see - tracing paper, with presence of fats

Image of Steel Spoon

Image of Steel Spoon

Image of Steel Spoon

  • 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.