Tag: plastic

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Multiple choice chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

Thermosetting plastics cannot be softened by heating because:

  1. they are cross linked polymers with hydrogen bonds b/w each other.

  2. they are linear chains of polymers

  3. they are large cross-linked molecules with strong covalent bonds b/w the atoms along each chains

  4. they are large cross-linked molecules with strong electrovalent bonds between the atom along each chain.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thermosetting polymers are formed from monomers of viscous state which changes irreversibly on heating into an infusible insoluble polymer. They have high crosslinks due to which they are rigid.

Multiple choice chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

Which of the following properties of plastic make it most convenient to use?

  1. It is non-reactive

  2. Light, strong and durable

  3. Easily remouldable

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plastics are non-reactive at room temperature and others are highly reactive.

Because of lower density than metals, plastic is light, strong and durable so can be molded in different shapes and sizes easily.
So all the options are correct, all are properties of plastic.

Option D is correct answer.

Multiple choice chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

Which one among the following is a thermosetting plastic?

  1. PVC

  2. PVA

  3. Bakelite

  4. Perspex
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Bakelite is another name of phenol formaldehyde which is a thermosetting plastic so bakelite is a thermosetting plastic.

Plastic which has cross-linked (3D) structure and is generally made by the condensation polymerization method is called thermosetting plastic. It can't be reused once it is processed.

Multiple choice chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

Which of the following is not correct regarding terylene ?

  1. Condensation polymer

  2. Synthetic fibre

  3. Step-growth polymer

  4. Known as dacron

  5. Thermosetting plastic
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Terylene is a synthetic polymer formed by the condensation polymerization reaction of terephthalic acid and ethylene glycol with the release of a methanol molecule. 


It forms by a step-growth polymerization mechanism in which a bi-functional or multifunctional monomer react to form the first dimer, then trimer, longer oligomer and eventually long-chain polymers. 

It is also called as Dacron and is a thermoplastic, which can be remelted time and again without producing any change.

Multiple choice chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

Which of the following is NOT true?

  1. Thermosetting plastic are bad conductors of heat and electricity.

  2. Thermoplastics are good conductor of heat and electricity.

  3. Plastic do not get corroded easily.

  4. Plastic is also a polymer.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Thermoplastic polymer can change their properties when heated and cooled. All plastics are bad conductors of heat and electricity.


Option B is correct.

Multiple choice chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

Which of the following is a property of plastic?

  1. Flame resistant

  2. Non-corrosive

  3. Mouldable

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The properties of the plastics are as follow:

  • They can be easily molded.
  • They are non-corrosive.
  • They are flame resistant.
  • They are a bad conductor of electricity.
Thus all the properties that are given in the options are properties of plastic.

Multiple choice chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

Which material is used for making:
(i) Saucepan handles
(ii) Electric plugs/switches/plugboards

  1. Bakelite

  2. PVC

  3. Polythene

  4. Polyester
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(i) Saucspan handles are made of bakelite as it is a bad conductor of heat.
(ii) Bakelite is also a bad conductor of electricity so the electric plugs, switches, etc. are made of it.

Multiple choice chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

What characteristic property of plastic makes it useful in making containers for storing food items?

  1. They do not react with food stored in them

  2. They are poor conductors of electricity

  3. They are light weight and strong

  4. They are non-degradable.
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

Since plastics do not react with water and air, they are noncorrosive in nature and are thus used for storage.