 Felly yw'r ysgolion y gallwch chi'n dweud o'r polimeriaid ym Eithin. Felly yw'r ysgolion ychydig o'r polimeriaid ym Eithin, a'r dweud o'r polimeriaid. Polimeriaid yw'r polimeriaid yw'r Eithin. Eithin yn alchynol, ddw'n dwy carbon atoms yn dweud o'r bandhau cyfaelio ddweud. Polimeriaid yw'r dweud o'r bandhau cyfaelio ddweud o'r teimlo yw'r 200 C ac mae'n gweithio fyddai hwybr o 2 000 atomau. Daeth y dweud o'r bandhau cyfaelio ddweud o'r dweud o'r bandhau cyfaelio ddweud o'r bandhau cyfaelio ddweud. Felly y dweud o'r bandhau cyfaelio ddweud. Felly y dweud o'r bandhau cyfaelio ddweud o'r polimeriaid. Felly, ynddo gyfaelio, yn polimeriaid ym Eithin ym Eithin. As you can imagine using different monimers creates different polymers with different repeat units along the chain and therefore different properties. We also have videos explaining the polymerisation of propene and chloroeethene. To write an equation for the polymerisation of ethene you should first start with the reactant ethene and to show the polymer product we must break the double bond and extend the covalent bond outside of either side of the square bracket. This shows us that it is this unit that is repeating along the molecules long chain. Since the number of molecules that can join together to make up the polymer can vary we use N to represent the number of repeat units. Consecwently we must also go back to ethene and balance the equation with N number of ethene molecules going in. This type of polymer is called an addition polymer. The monomer is just repeated and only one product the polymer itself is formed. The number of molecules that join together can vary anything between 2000 and even 20,000 making some very long polyethene molecules and this long chain lengths give rise to some of its properties. There are two different forms of polyethene low density and high density differing in how they are manufactured and their properties. Low density polyethene is commonly used for plastic bags and similar thin sheet like low strength products. High density polyethene often referred to as HDPE is stronger and has a higher boiling point. It has many uses some of which include plastic bottles, chemical and water pipes, food storage containers and even folding chairs and tables. Now by the end of this video you should be able to write equations for the formation of polyethene and give examples of some uses of this polymer.