Page 1 of 3 - About 26 Essays
  • Dmitri Mendeleev's Creation Of Elements In Our Universe

    Our world is made of elements and combinations of elements called compounds. An element is a pure substance made of atoms that are all of the same type. At this given time, 116 elements are known, and roughly about 90 of these occur naturally. But how do we know what elements are in our universe?, Scientists have developed many theories as to why and how we know. These theories consist of mainly the Big Bang Theory and how it had created the first and lightest elements in our universe, or Red giants(Dying stars) because as the dying star’s core begins to run out of hydrogen it begins to die and create carbon atoms as a result of it’s death, another piece of evidence we have on this topic is supernova’s because star releases a very large amount of energy and this allows elements heavier than iron such as uranium and gold to be produced. And the last piece of evidence that will be discussed thoroughly will be how Dmitri Mendeleev had devised the periodic table and the periodic law that allowed him to leave blanks in his invention based on the known and unknown elements in our universe. One of the main evidence we genuinely have on how we know what elements there are is the big bang theory which was the start of our universe. During the formation and expansion of the universe 13 .7 billion years ago, the big bang only created the lightest and most simple elements such as hydrogen and helium along with trace amounts of lithium and beryllium along side. After only a couple of…

    Words: 1034 - Pages: 5
  • Robert Mulvaney Summary

    This model was called the glaciological flow model. This model shows how the snow flowed and spread out as snow piled on. The deeper the layer is, the thinner the layer becomes because it was compressed more. This model gave the scientists an idea of the age of the layer of ice. The model was not perfect, they had to fix the model. They looked for particles from eruptions which were called tephra. The date of the eruption had already been determined so therefore, when tephra appeared in the…

    Words: 739 - Pages: 3
  • The Influence Of Liquid Water On Mars

    Many have asked the question why doesn't Mars have oceans? A recent breakthrough discovery has confirmed that liquid water does exist on Mars. This means there is the potential for life to exist here. However, this water is very minimal compared to previous levels of water found on Mars. A study done by Geronimo Villanueva and Michael Mumma of NASA’s Goddard Space Flight Center reveals that Mars used to have at minimum seven times as much water as it does today with there being enough water to…

    Words: 334 - Pages: 2
  • Differences Between Nuclear Fusion And Fission

    The concepts of nuclear fusion and fission have recently taken a great role on the future of energy acquirement. Nuclear energy seemingly is the way of the future as it is exceedingly more efficient than any means of energy that which we have now. In nuclear power plants, fission is used to generate the power required to develop steam which then powers turbines. Fusion on the other hand, is essentially the reaction that occurs in the sun. Essentially, "Hydrogen nuclei (such as deuterium and…

    Words: 556 - Pages: 3
  • Nuclear Fusion Disadvantages

    It takes place at such high temperatures that the gas produced turns into plasma. Usually, fusion is not feasible because of the electrostatic repulsion between 2 nuclei but if circumstances can be achieved where the 2 hydrogen isotopes, deuterium and tritium are heated to such an extent that they can overcome electrostatic repulsion, the 2 nuclei can fuse to release a tremendous amount of energy. This is currently being achieved by the Tokamak reactors. Nuclear fusion doesn’t risk running out…

    Words: 1491 - Pages: 6
  • The Sun Produces Light And Heat

    gravitational force that acts in the core. This gravitational force also creates a large amount of pressure in the core. This extreme pressure and temperature is necessary for nuclear fusion to take place. Nuclear fusion is the combining of light nuclei into a larger, heavier nucleus. This combining of nuclei releases a large amount of energy that then travels through the other layers of the sun. The main type of nuclear fusion that occurs in the sun is proton-proton chain reaction. In this…

    Words: 1265 - Pages: 6
  • The Importance Of Clean Energy In China

    In western countries, nuclear power as an important energy, research in twenty-first century has not been interrupted, and has made great achievements. According to public information, we know that the energy of nuclear power generation comes from the fission energy released by the uranium fuels in a nuclear reactor. In order to achieve the polymerization of light nuclei, there must be a large amount of deuterium and tritium. Fortunately, there exist a large number of uranium fuels on the earth…

    Words: 778 - Pages: 4
  • Disadvantages Of Nuclear Fusion

    Nuclear fusion has no chance of producing radiation, greenhouse gases, or any other harmful substances simply because there is not any possibility of creating any of these harmful substances. The reaction to produce energy creates three products: Helium, a fast neutron and energy. It is physically impossible to create any thing else. Fuel The fuel for nuclear fusion is very important for the argument to use it as a renewable energy source. Deuterium and Tritium, the fuel of the reaction, are…

    Words: 1016 - Pages: 5
  • Importance Of Crystal Structure Of Materials

    range 200nm-2000nm. Principle Working of UV-Visible spectrometer The UV-vis spectrometer is a dual beam, ultraviolet, visible light and near infrared spectrometer. The schematic of the UV –Vis spectrometer is shown in the fig. This instrument is able to record data from 190nm to 3300nm. The varian software is used to operate the instrument and displays the absorbance readings for corresponding to fixed wavelengths. Additional software modules are also available for further…

    Words: 1032 - Pages: 5
  • Spectrophotometry Essay

    returns to the ground state. The energy is often released as heat, however in some cases, light (photons) is also emitted. In UV-Vis spectroscopy, the molecule absorbs at a given wavelength, the wavelength that is not absorb is complementary to one another. Figure 13: As shown, absorbance patterns follow the theory of complementary colors. In the experiment, the solutions had an orange hue, meaning that the wavelength the molecules absorbs is within the blue region (430-490 nm).…

    Words: 1325 - Pages: 6
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