Question

preface for class 12 chemistry project on the topic polymers

Answer 1

In place of 9th std you can write 12th std and write the project summary

Answer 2

A compound is a substance whose molecule is built up of atoms from different elements .

A polymer is a substance made up of many molecules combined together ,a polymer is usually a long chain of monomers

Examples of polymers include

1.synthetic nylon

2.synthetic silk

3.wool