Poly (butylene terephthalate) is a plastic material used in automotive ignition systems and has the formula:

Suggest the monomers which might be used to synthesise this polymer.

Poly (butylene terephthalate) is a plastic material used in automotive ignition systems and has the formula: Write the reaction.

Poly (butylene terephthalate) is a plastic material used in automotive ignition systems and has the formula: What type of polymer is it ?

Poly (butylene terephthalate) is a plastic material used in automotive ignition systems and has the formula: Is this an addition polymer or condensation polymer?

Suggest some ways to reduce the use of plastic materials.

In which ways use of plastic materials is harmful for environment and society?

Name a polymer which is used as a substitute for wool. What is its monomer unit?

Which of the following polymer can be formed by using the following monomer unit?

A polymer which is commonly used as a packaging material is

classically an electron can be in any orbit around nucleus of an atom. Then what determines the typical atomic size? Why is an atom not, say, thousand times bigger than its typical size? Thequestion had greatly puzzled Bohr before he arrived at his famous model of the atom that you have learnt in the text. To simulate what he might well have done before his discovery, let us play as followswith the basic constants of nature e, me, c and see if we can get a quantity with the dimensions of length that is roughly equal to the known size of an atom (~ 10 m).- You will find that the length obtained above is many orders of magnitude smaller than the atomic dimensions. Further, it involves c. But energies of atoms are mostly in non-relativistic domain where c is not expected to play any role. This is what may have suggested Bohr to discard c and look for else h had already made its appearance elsewhere. Bohr lay in recognising that h, m_e , and e will yield the right atomic size. Construct a quantity with the dimension of length from h, me, and e and confirm that its numerical value has indeed the correct order of magnitude.

It was observed that a pencil sharpener gets attracted by both the poles of a magnet although its body is made of plastic.Name a material that might have been used to make some part of it.