CHEM 3125 Experiment 4: Multistep synthesis of tetraphenylcyclopentadienone Overall Synthesis: CHEMICALS: wk 1: thiamine hydrochloride (1 g/student)‚ 95% ethanol (8 mls/ student)‚ 2M NaOH (5 mls/student)‚ benzaldehyde (4 mls/student) wk 2: 95% ethanol (30 mls/student) wk 3: acetic acid (6 mls/student)‚ ammonium nitrate (1 g/student)‚ 0.1g/ml cupric acetate (1.5 mls/student)‚ dichloromethane (6 mls/ student)‚ 30% acetone in heptanes (3 mls/student)‚ 95% ethanol (20 mls/student) wk 4:
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Ground Zero It was 1945‚ and after years of grueling fighting in the most devastating war in history‚ Nazi Germany surrendered to the Western Allies. This was not the end‚ however‚ as both the condition and attitude of Japan showed they were still ready to fight. Military action needed to be taken against them. Luckily‚ the United States had been working on a secret plan called “The Manhattan Project‚” in which they were constructing a military weapon unlike anything the world had ever seen. When
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Synthesis Paper Dawn I Gaunt Introduction to Graduate Studies 5093 3 October 2014 Social and natural sciences differ dramatically‚ but they both play very important roles. Social sciences are concentrated on the human response to the environments that we ourselves have created and the natural environment. Social science experiments‚ which are documented by human observation‚ provide no absolutes due to their methods of data collection and analysis. The observations‚ the sample groups‚ and
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2013) Protease inhibitors can be used in medicine to treat different diseases and viruses which depend on protease for its mechanism of action. Protease inhibitors are most commonly used in the treatment of HIV/AIDS. Protease is responsible for the synthesis of new viral cells which would cause HIV to spread to uninfected cells. When the protease is introduced however‚ non-infectious vial particles are produced. The protease involved in HIV is called the HIV protease which is an aspartic protease (San
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HISTORY OF ZERO This essay summarises the development of zero‚ as both digit and number‚ from early to modern civilisations. More willing to accept the concept of void‚ the Eastern civilisations are credited with the invention of zero. The Western civilisations‚ on the other hand‚ struggled for almost two millennia to finally accept zero. The history of zero from merely a placeholder in place value systems (digit) to finally becoming accepted as a number has a very long history in Western
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Critical Synthesis Urban Sociology introduced students to five seminal texts from the field. While studying cities (and their surrounding areas)‚ and their political‚ economic‚ and social institutions‚ it is important to understand the key themes covered in these books: contested space (both for the arenas of land development and redevelopments as well as for various geopolitical interests); residential segregation; poverty; inequality (and the roles that government agencies play in exacerbating
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Zero Conditional: (General truths – things which always happen). (When/If). If I have time (present)‚ I will go to the cinema (future). If you heat water (present)‚ its boils (present). If you heat ice‚ it melts. Wood doesn’t burn If there is no air. Inversion: This country has NOT witnessed such a serious financial crisis BEFORE. (Never before). NEVER BEFORE HASN’T THIS COUNTRY WITNESSED SUCH A SERIOUS… IT’S RARE THAT a politician admits publicly that he had make a mistake. (Seldom).
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Zero is a unique number that means “empty space” and that which represents a number and its use for computation. It was conceived from the Hindus from India. The earliest recorded evidence was found on the Gvalior inscription‚ however‚ the zero we are accustomed to today‚ came much later. Zero has two basic uses: to mean empty space or to represent a number used for computation. It is especially important in positional notations. Positional notations‚ is a numerical system in which each position
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The two essays‚ “Work and Workers in the Twenty-first Century" and "The Untouchables" bring out great points that everyone should take into consideration. One being that the work field is rapidly changing and people need to start focusing on their skills. Not only did they both address how it is changing but also how many more opportunities there will be‚ not just for certain people‚ but for everyone. In the essays “Work and Workers in the Twenty-first Century" and "The Untouchables" they both
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Zero is a number and a digit used in mathematics to represent that number in numerals. Zero is not a natural number but it is the smallest whole number. There are two important uses of zero. Firstly‚ in place value number system it is used as empty place indicator. Hence‚ in this number‚ 5102‚ the positions of 5 and one are correct just because of the inclusion of zero. Five is denoting a thousandth place value. Similarly if we omit zero from 5102 that is 512‚ then 5 denote a hundredth place value
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