1 Age in years is for student at the start of the academic year-about early September for most schools in the UAE, early April for Indian and Pakistani schools. 2  Check the exact date with the school if your child has a birthday around this time.
The repeating structural unit of most simple polymers not only reflects the monomer(s) from which the polymers are constructed, but also provides a concise means for drawing structures to represent these macromolecules. For polyethylene, arguably the simplest polymer, this is demonstrated by the following equation.
Some polymer molecules contain hundreds or thousands of monomers and are often called macromolecules .Â¾Polymers may be natural, such as leather, rubber, cellulose or DNA, or synthetic, such as nylon or polyethylene.