Chemistry

Lecture on Svante Arrhenius

Svante Arrhenius (1859-1927) was a Swedish scientist who was the first to claim that fossil fuel combustion might result in enhanced global warming. Despite primitive data, his calculations about temperature magnitudes but not timing were consistent with present day predictions. One of the founde.....

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Lecture on Dmitri Mendeleev

Dmitri Mendeleev (1834 – 1907) was a Russian chemist . He created the first version of the periodic table of elements, and used it to predict the properties of elements yet to be discovered. Using his periodic table, Mendeleev predicted the existence and properties of new chemical elements.....

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Lecture on Louis Pasteur

Louis Pasteur (1822 – 1895) French microbiologist and chemist, made remarkable breakthroughs in the causes and prevention of diseases and invented the process of Pasteurization. Louis Pasteur discovered that microbes were responsible for souring alcohol and came up with the process of pasteuri.....

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Lecture on Transuranium Elements

The first transuranium element was produced at the University of California at Berkley in 1940 by E. M. McMillan and P. H. Abelson. The transuranium elements are elements with atomic number greater than that of uranium (Z=92), the naturally occurring element of greatest Z. List of the transuran.....

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Presentation on Nuclear Reactions

Nuclear chemistry is the study of changes in an atoms nucleus. Reactions that involve a change in the nucleus of an atom are called nuclear reactions. This lecture briefly describe on characteristics of Nuclear Reactions. Nuclear Reactions occur when nuclei emit particles and/or rays. Atoms ar.....

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Lecture on Radiation Therapy

Radiation therapy uses ionizing radiation to treat cancer i.e. to destroy cancerous cells. There are two techniques in radiation therapy that are used to treat cancer using ionizing radiation: Radiotherapy and Brachy therapy. Every treatment using radiotherapy has to be rigorously planned. Th.....

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Effects of Ionizing Radiation

Ionizing radiation can kill or change the nature of living cells. The effects of the damage inflicted by the ionizing radiation may be severe and cause immediate effects, or not become apparent for a long time. The biological effect of radiation depends on the type of radiation; the type of b.....

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Effects of Radiation on Living Things

Main objective of this lecture is to present on Effects of Radiation on Living Things. Radiation may be absorbed by the medium it passes through. Radiation can kill living cells or change the nature of living cells. All living things contain living cells. We have many different types of cells.....

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Nuclear Fission vs. Nuclear Fusion

Nuclear fission is a nuclear reaction in which a heavy nucleus splits into lighter nuclei and energy is released. Nuclear fusion is a nuclear reaction in which a light nuclei combine to give a stabler heavy nucleus plus possibly several neutrons, and energy is released. Both fission and fusion a.....

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Mass Energy Calculations

Major objective of this lecture is to present on Mass Energy Calculations. The change of energy is related to the change in mass, according to the mass-energy equivalence relation derived by Albert Einstein in 1905. Energy and mass are equivalent and related by the equation; E = mc². The equ.....

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Applications of Radioactive Isotopes

The aim of this lecture is to present on Applications of Radioactive Isotopes. A radioactive tracer is a very small amount of radioactive isotope added to a chemical, biological, or physical system to study the system. A series of experiments using tracers was carried out in the 1950s by Melvi.....

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Rate of Radioactive Decay

The rate of radioactive decay, that is the number of disintegrations per unit time, is proportional to the number of radioactive nuclei in the sample. The half-life is the time taken for the activity of a given amount of a radioactive substance to decay to half of its initial value. The mean lif.....

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