What is soft metals ?
Metals like sodium and potassium are soft and can be cut with a knife.
Characteristics of non metals
Those materials are soft, non – lustrous, non malleable, non ductile, non sonorous and bad conductors of heat and electricity. The materials which generally possess these properties are called non metals. The examples of metals are oxygen, nitrogen, carbon etc.
Characteristic of metal
Those materials are hard, lustrous, malleable, ductile, sonorous and good conductors of heat and electricity. The materials which generally possess these properties are called metals. The examples of metals are iron, copper, aluminium , calcium, magnesium, etc.
What is sonorous ?
Metals produce ringing sounds, they are said to be sonorous.
What is ductility ?
The property of metal by which it can be drawn into wires is called ductility.
What is malleability ?
The property of metals by which they can be beaten into thin sheets called malleability.
What is 5 R principle ?
The 5 R principle. Reduce, Reuse, Recycle, Recover and Refuse. Develop habits which are environment friendly.
What is biodegradable and non-biodegradable substances ?
A material which gets decomposed through natural processes, such as action by bacteria, is called biodegradable. e. g cotton, paper , vegetables and fruits etc . A material which is not easily decomposed by natural processes is termed non-biodegradable. e.g DDT , Glass ,plastics etc.
Teflon
Teflon is a special plastic on which oil and water do not stick. It is used for non-stick coating on cookwares.
USES OF PLASTICS
Plastics find extensive use in the healthcare industry. Some examples of their use are the packaging of tablets, threads used for stitching wounds, syringes, doctors’ gloves and a number of medical instruments