This document discusses different properties that can be used to sort materials into groups, including appearance, hardness, solubility, and transparency. Appearance depends on whether a material has a lustre or not, hardness depends on how easily a material can be compressed or scratched, solubility depends on whether a material dissolves or remains intact in water, and transparency depends on whether light can pass through a material clearly, not clearly, or not at all. These properties can be used to categorize common materials like metals, paper, glass and determine if they are opaque, transparent, translucent, soft, hard, soluble or insoluble.

1. SORTING MATERIALS INTO
GROUPS
Lata Sant
B.Ed.(2014-2015)

2. Properties of materials
1. Appearance
2. Hardness
3. Soluble & Insoluble
4. Transparency
a) Opaque
b) Translucent

3. APPEARANCE
• Materials that have lustre are usually metals
examples- Iron, copper, aluminium, gold are
examples of metals
• Materials like paper, cardboard, wood etc. do
not have lustre.

4. HARDNESS
• Materials which can be compressed or
scratched easily are called soft.
Example- Iron
• Materials which are difficult to compress are
called hard.
Example- cotton or sponge

5. SOLUBLE
Some substances have completely
disappeared or dissolved in water. Such
substances are called soluble substances.
INSOLUBLE
Other substances do not mix with water and
do not disappear even after we stir for a long
time. These substances are insoluble in water.

6. TRANSPARENCY
TRANSPARENT
Those substances or materials through which things can be
seen are called transparent.
Example: Glass,water, air,some plastics
OPAQUE
There are some materials through which we are not able to
see. These materials are called opaque. Example: wood,
cardboard,metals.
TRANSLUCENT
The materials through which objects can be seen but not
clearly are known as translucent. Example- Oil patch on
paper.

7. ACKNOWLEDGEMENT
• NCERT book of std 6.
• www. GSEB.com