Tag: synthetic fibres and plastics

Quizzes (16) Questions (42)

Questions Related to synthetic fibres and plastics

Multiple choice chemistry synthetic fibres and plastics environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

State whether true or false :

Plastics are insoluble in water.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 Plastics are high molecular weight (macromolecular or polymeric) organic substances that are synthesized from low molecular weight compounds. 


The organic monomers are hydrophobic in nature due to the presence of hydrocarbons and thus makes plastics water insoluble.


Example: polyethene- a polymer of ethylene.

Therefore, option A is correct.

Multiple choice chemistry synthetic fibres and plastics environmental impact: plastics plastic plastic plastic waste garbage in, garbage out
Statement: Teflon doesn't stick to the materials and can be easily used in non-sticky pans and other cookware.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Teflon is a synthetic polymer of polytetrafluoroethylene that can be used to cover the surface of a certain object and imparts nonstick properties to it.  


Teflon is used for non-stick material because :


1. It is highly inert, i.e. doesn’t react with other substances easily.

2. It has a high melting point and shows exceptional electrical properties, which makes it an excellent choice to be used for the wiring of computer and aerospace applications.

3. Non-stick quality, which is why it’s used in numerous frying pans, pots, and other culinary tools.

Hence, the given statement is $\text{true}$.

Multiple choice chemistry synthetic fibres and plastics environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

Statement: Plastics which get deformed easily on heating and can be bent easily are known as thermoplastics.


State whether the given statement is true or false.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Plastics are categorized into thermosoftening/thermoplastic and thermosetting/thermoset plastics.


In thermosoftening/thermoplastic, the forces between the polymer chains are weak, so they can easily be remoulded into new shapes. 

This makes it possible to recycle this type of plastic. whereas in thermosetting plastics there are strong covalent bonds forming cross-links between the polymer chains, making these plastics hard and rigid. Once set into its original shape, a thermosetting plastic can't be softened and remoulded. 

The strong bonds between polymers also mean that thermosetting plastics are much more heat resistant than thermosoftening ones.

Hence, the given statement is $\text{true}$

Multiple choice chemistry synthetic fibres and plastics environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

Plastics are capable of molding and casting into various shapes and size plastic.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Plastics are categorized into thermosoftening and thermosetting plastics.
In thermosoftening plastics, the forces between the polymer chains are weak, so they can easily be remoulded into new shapes. This makes it possible to recycle this type of plastic. whereas in thermosetting plastics there are strong covalent bonds forming cross-links between the polymer chains, making these plastics hard and rigid. Once set into its original shape, a thermosetting plastic can't be softened and remoulded. The strong bonds between polymers also mean that thermosetting plastics are much more heat resistant than thermosoftening ones.
Example: Melamine is an example of a thermosetting plastic and polythene is a thermosoftening plastic.
Option A is correct

Multiple choice chemistry synthetic fibres and plastics environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

State whether true or false :

Bakelite is the first synthetic thermosetting plastics.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bakelite is prepared in laboratories by controlling the pressure and temperature applied to phenol and formaldehyde. 


Baekeland produced a hard moldable material which he named "Bakelite". 

It was the first synthetic thermosetting plastic ever produced.

Therefore, option A is correct

Multiple choice chemistry synthetic fibres and plastics environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

Substances which cannot be decomposed by micro-organisms are called non-biodegradable substances.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Biodegradable substances are such materials which are and can be degraded by natural factors like microbes (e.g. bacteria, fungi and few more), abiotic elements like temperature, UV, oxygen, etc.
Unlike biodegradable, non-biodegradable substances like plastics, cannot be easily handled and cannot be decomposed or dissolved by natural agents.
Option A is correct

Multiple choice chemistry synthetic fibres and plastics environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

Plastics are eco-friendly.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plastics are human-made polymers and are non-biodegradable which means they cannot be easily handled and cannot be decomposed or dissolved by natural agents like microbes (e.g. bacteria, fungi), abiotic elements like temperature, UV, oxygen, etc. Thus are not eco-friendly.
Option B is correct

Multiple choice chemistry synthetic fibres and plastics synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

Synthetic fibres are obtained by :

  1. chemical processing of petrochemicals

  2. chemical processing of natural fibres

  3. manual processing of petrochemicals

  4. Both A and B
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The compounds that are used to make synthetic fibres come from raw materials such as petroleum-based chemicals or petrochemicals. 


These materials are polymerized into a long, linear chemical that bond two adjacent carbon atoms. 

Differing chemical compounds will be used to produce different types of fibers.

Hence the correct option is A.

Multiple choice chemistry synthetic fibres and plastics synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

Synthetic fibres are better than natural fibres because :

  1. they are man made

  2. they are cheaper

  3. they are eco friendly

  4. their length can be controlled
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Synthetic fibres are cheaper than natural fibres. The synthetic fibers are cheap because they are built from cheap raw materials and produced very efficiently; for example, nylon and polyester are mostly built from oil by-products and are efficiently produced in huge amounts.