Chemistry Revision F331 Isotopes - atoms with the same atomic number‚ but different mass numbers 131I - radioactive tracer for thyroid. 99Tc for tumours. Radioisotopes - gamma emitters & short half life - long enough to detect‚ but not long enough for damage. Beta particles emitters are more useful than alpha particle emitters because they penetrate more and so are more easily detected. Also‚ less damaging. The half life is the time taken for half the isotope to decay Mass left = initial
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We’ve all heard it for many years now‚ the importance of making sure we drink enough water to keep our bodies healthy. After all‚ the human body is composed of mostly water‚ with adults averaging 55% - 60% water and babies averaging closer to 75%. The human brain is actually made up of close to 70% water (why you feel foggy headed when you are dehydrated)‚ and the lungs are closer to being 90% water. Beyond ensuring you drink plenty of water‚ it’s equally important‚ if not more so‚ to ensure you
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on fission: splitting heavy atoms into lighter components in a controlled fashion. Though fission is safe when all goes well‚ the fuel is radioactive‚ waste disposal can be problematic‚ and as the Fukushima disaster showed there is a high cost to accidents. Nuclear fusion is in principle cleaner and comes from a cheaper‚ more abundant fuel source: an isotope of hydrogen called deuterium can be extracted from water and only helium is produced as waste. From The Matrix to SimCity 2000 to political
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strongest of the four forces‚ because of its tiny range the strong force cannot be directly detected in macroscopic bodies. The Weak Nuclear Force doesn’t so much hold things together as break them apart. The weak force is behind the processes of radioactive decay‚ when an unstable nucleus splits into two or more pieces. One important process in particular it is responsible for is beta decay. This happens when a neutron emits an electron and transforms itself into a proton‚ changing the atom into another
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http://www.kewpid.com 1. Fossil fuels provide both energy and raw materials such as ethylene‚ for the production of other substances 1) Construct word and balanced chemical equations of chemical reactions as they are encountered • Methane + oxygen carbon dioxide + water • CH4(g) + 2O2(g) CO2(g) + 2H2O(l) 2) Identify the industrial source of ethylene from the cracking of some of the fractions from refining of petroleum Generally‚ demand for petrol exceeds supply produced from fractional distillation
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Lesson 08.01: Half-life and Radioactive Decay · Distinguish between nuclear and chemical reactions. · Compare and contrast different types of nuclear decay and the properties of the three types of radiation (alpha‚ beta‚ and gamma) discussed in the lesson. · Be able to predict the isotope or radiation produced by a nuclear decay reaction when the other product is given. · Describe and make predictions regarding half-life‚ including using a graph or set of data to determine the half-life of
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miscarry or give birth to children with disabilities ("The Effects of Nuclear Weapons"). However‚ these ‘long’-term effects on the human body are still relatively short term. Currently‚ the long-term genetic consequences from a massive release of radioactive fallout on a worldwide basis is unknown (“Effects of Nuclear Weapons"): these long-term consequences could be something one would see in a apocalyptic TV series‚ or it could be something entirely. One thing is certain: the long-term effects of nuclear
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by the electrons in the outer shell d. lest than the sum of the charges of the protons in tire nucleus due to nisielding by the electrons in the lower‚ filled shells a. greater than the suns of the charges on the protons in the nucleus 4. isotopes are a. atonts with the same nutotber of neutrons but different nuntbers of protons b. atoms seitls the same number of protons but different numbers of neutrons c. atoms witls tire same sum of neutrons plus protons but different numbers of neutrons
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The Origin and Evolution of Life on Earth Why do we start the discussion of biology with a discussion of geology? Here are some reasons why one would do this: * All life on earth is linked to geology; likewise‚ many surface geologic features and processes have been influenced by life on earth. The origin and early evolution of the earth are especially important when looking at the origin and early evolution of life on earth. * Life chemistry had its origin with the elements available to
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CHEMISTRY 4 MRS. ALINGER ELEMENT RESEARCH PAPER NOVEMBER 25‚ 2014 Kara Link Mrs. Alinger Chemistry 4 25 November 2014 Krypton: The “Super Element” When you first hear the word “Krypton”‚ you may think of the fictional planet that America’s superhero Superman once called home. However‚ krypton is also the name of a chemical element here on our own planet Earth. Though it is a rare‚ unreactive noble gas‚ krypton does play a significant role in today’s world in ways that are unfamiliar to most
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