Question

During the summer holidays, a group of children collected a lump of salt, green grass, a broken glass piece, a small thermocol box, a pen, iron nail, glass marbles, hair, a naphthalene ball, a piece of sugar candy (mishri), and tried to group them on the basis of properties given in the table below. Help them in filling the table.

Name of the material	Appearance (Hard/soft)	Transparency (Transparent/Translucent/Opaque)	Floats/Sinks in water	Soluble/Insoluble in water

Answer 1

Transparent substances:

1. The materials or substances classified as transparent allow objects to pass through them.
2. Transparent things may be traversed by almost all light rays.

Opaque substances:

1. Materials or substances that block the passage of light are said to be opaque.

Translucent substances:

1. Translucent items are those that fall between opaque and transparent materials that permit some light rays to travel through them, but not all of them.

Name of the material	Appearance (Hard/soft)	Transparency (Transparent/Translucent/Opaque)	Floats/Sinks in water	Soluble/Insoluble in water
Lump of salt	Hard	Opaque	Sinks	Soluble
Green grass	Soft	Opaque	Floats	Insoluble
Broken glass piece	Hard	Transparent	Sinks	Insoluble
Thermocol box	Soft	Opaque	Floats	Insoluble
Pen	Hard	Opaque	Floats	Insoluble
Iron nail	Hard	Opaque	Sinks	Insoluble
Glass marbles	Hard	Transparent	Sinks	Insoluble
Hair	Hard	Opaque	Floats	Insoluble
Naphthalene ball	Hard	Opaque	Floats	Insoluble
A piece of sugar candy	Hard	Opaque	Sinks	Soluble