Question

Explain the difference on the basis of properties
Thermosetting plastics and thermoplastics.
2) physical properties of metals
metals and non metal
physical properties
3 Useful
micro organisms and harmful micool
organisms​

Answer 1

Answer:

The primary difference between the two is that Thermoset is a material that strengthens when heated, but cannot be remolded or heated after the initial forming, while thermoplastics can be reheated, remolded, and cooled as necessary without causing any chemical changes.

Answer 2

αnswers :-

1 ) Thermosetting plastics and Thermoplastics  

• In thermoplastics, the process of softening by heating and hardening on cooling can be repeated again and again to soften the plastic to get different shapes.  

Example – Polyethene  

• However, thermosetting plastics can be softened by heating only once. Once they are put into a mould and allowed to harden on cooling, they cannot be softened again on heating.  

Example – Bakelite

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2 )  Physical properties of metals and non metals

Physical state :

• Metals are generally solid at room temperature.  

Exception – Mercury  

• Non metals occur as solids, liquids or gases.  

Example – Carbon, Bromine and Oxygen

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Lusture :

• Metals have metallic lustre that is having a shiny appearance.  

Example – Gold  

• Non- metals do not have a metallic lustre.  

Example – Bromine  

Exception – Iodine and Graphite

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Hardness and strength :

• Metals are hard and strong.  

Example – Iron  

Exception – Sodium and Potassium  

• Non-metals are generally not so hard and strong.  

Exception – Diamond

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Malleability and Ductility :

• The property of metals by which they can be beaten into thin sheets.  

• The property of metals by which they can be drawn into thin wires.  

• Non-metals are neither malleable nor ductile.  

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Conductivity :

• Metals are good conductors of heat and electricity.  

• Non-metals are bad conductors of heat and electricity.

Exception – Graphite  

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Melting and Boiling Points :

• Metals generally have high boiling and melting points  

Exception – Sodium and Potassium  

• Non-metals have low melting and boiling points  

Exception – Graphite and Diamond  

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3 ) Useful micro-organisms and harmful micro-organisms

• Harmful micro-organisms are those can cause infections and diseases if entered in an organisms. They are also called pathogens.  

Example – Mycobacterium  

• Useful micro-organisms are those which help us in many ways without causing any harm. They are helpful in the following ways ::  

→ In food and beverage industry  

→ In making medicines and vaccines  

→ In agriculture  

→ In cleaning the environment  

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