B Y A D I T I A T M A S I D H A

Properties Of Matter And Material

Introduction

There are 3 states of matter:

Solid

Liquid

Gas

There are many changes in states of matter: melting, freezing, boiling, condensation, sublimation and dissolving.

Elements

Elements: a substance that has just one kind of atom is called element.

There are 93 elements which occur naturally.

There are 24 man-made elements by using particle accelerators.

Particles are whizzed around inside the accelerator, and then made to crash into each other to make atoms of new elements.

Metals and Non-metals

Property Metals Non-Metals

Surface Shiny Dull

Physical state at roomtemperature

Usually solid [except Mercury]

Solid, Liquid, Gas

Strength Can be shaped by pressing and stretching without breaking easily

Solids are usually soft or brittle

Melting point Usually high Usually low

Boiling point Usually high Usually low

Density Usually high Usually low

Conduction of heat Good Very poor

Conduction of electricity Good Very poor

Metals and Non-metals

The air is the mixture of non-metal elements. Most of it is [78%] nitrogen and one fifth [20%] is made up of oxygen.