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A-LevelChemistry open book chemistry salters
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Addition polymerisation is the construction of a polymer based upon simple monomer units. These monomers join together in an extremely long chain under the correct conditions of temperature and pressure to become a single polymer chain. Mechanism of the polymerisation of ethane to form LDPE This reaction takes place in three complex stages. The three stages are Initiation, Propagation and Termination. First stage is Initiation: The radicals are formed by decomposition of an initiator, the radical can be obtained by heating up the initiator, until it releases a free radical. The radicals react with a...
arrange in a regular way, there was a down side. For if the catalyst was "damaged" or "poisoned", such as which when there was traces of nickel compound, then evidently the chains would stop growing. The other thing was that the catalyst can only be worked with small hydrocarbon monomers. This means the catalyst can only made a certain range of polymers. This problem was solved by metallocene catalysts. However, the problem with this was that, a particular metallocene is likely to produce one form of poly propene. So total control had still not been achieved yet.

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Education vs SportsSome say that sports...Education vs SportsSome say that sports in America are favored more by people who live elsewhere. I wonder why. Studies have shown that some people like the fact that most sports have some type of physical contact. Why is that most Americans rather watch sports on television than read a book, maybe because some find it more interesting? I find that reading is just as interesting as watching sports or doing anything else. In my opinion education is more important than sports.When I was a child I was enrolled in Head Start. Head Start is a program for kids that are too young to start school yet. Being in Head Start puts you ahead of your class. The program was designed to better prepare you for your future academic success. Once it was time for you to advance to preschool you were given a test to see if you had learned a sufficient amount of information to past preschool to go right into first grade. If you did not pass the test you still went to preschool with some sense of what was ahead. Either way you were still progressing in Head Start. Although Head Start is not required for kids parents enrolled their kids in the program to better prepare them for their upcoming school years. I havenÔÇÖt found any sports program that parents enrolled their kids in before they put them in something educational. My parents instilled in me that education is the key to success. This is where my view on sports vs. education originates from. I believe that education is the key and is more important than any sport. Growing up most, if not all parents told their kids to go to school and get good grades so that you can get a good job and raise your own family one day. Being told that, that was most kids goal. In school you learned your required task to go to the next grade. The feeling of accelerating to the next grade is awesome! Once you have achieved this feeling you will want to pass all your courses not only because your parents told you but to feel accomplished. I loved that feeling! I strived for excellence in all my class. You can be a sports fan and still value education. The problem comes in when you values sports more the education. In middle school sports were introduced into the school atmosphere. I believed that this was a good thing at one point of time. Before middle school, sports were played just for fun around the school. They were only taken seriously if you were on a recreational team which was done outside of school. This still put education before sports or any other extracurricular activities. I wonder what made thing change. It seems as if education was the main topic for kids. It was extremely important to go to school solely for an education to better yourself. Somewhere in time the reason for going to school changed. 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