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Isotopes

My chemistry summer holiday project
by

Sian Hendon

on 14 September 2012

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Transcript of Isotopes

By Sian Hendon Isotopes What are... Stable The natural abundance of isotopes refers to the number of naturally occuring isotopes. Natural abundance As isotopes are created, they are formed with a compromise... Half Life Apples which really can make you live longer... iFood vVideo @font-face
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} He 4 2 2 3 He On Earth, a common examples of a naturally occurring isotopes are the three isotopes of uranium:-238U, 235U and 234U. These isotopes can survive for thousands of years before decaying. Radioactive uranium isotopes can be used in the nuclear industry to produce more nuclear energy. What kind of isotopes are used? Finished Work? Impact Start Carbon-13 Deuterium By replacing the carbon or hydrogen with a heavier version of the same element i.e. and isotope, the reaction will be slowed down due to the kinetic isotopic effect. The natural abundance of an isotope varies from planet to planet, but stays relatively constant in time. If 100,000 uranium atoms were analyzed, one would expect to find about 99,275 238U atoms, 720 235U atoms, and no more than 5 or 6 234U atoms. This is because 238U is much more stable than 235U or 234U, as the half-life is longer. The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. This process is known as nuclear fission. The nucleus of an atom splits into smaller parts (lighter nuclei), often producing free neutrons and photons (in the form of gamma rays) This releases a very large amount of energy, even by the energetic standards of radioactive decay. Nuclear fission rarely occurs naturally, but can happen with very high mass number isotopes. The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy dog. Earth Isotopes? Isotopes are the same except for an extra neutron or two... & Unstable Isotopes so it seems even atoms are temperamental... Stable isotopes don't change into other isotopes; they're stable. Unstable isotopes are radioactive and prone to disintegration, emission gamma, alpha, beta and have half life Prezi Slide It works by seeding 'heavy' non-radioactive isotopes into cells in order to reduce or even stop oxidative stress in cells. :¬) Oxidative stress is basically an imbalance of the systematic production of reactive oxygen species (they are reactive because they have unpaired valency shells) and the ability for the body to detoxify itself i.e. remove the harmful ROS. Oxidative stress is the focus of this research The eyes focus mostly on the title, then the first bullet point. From there the focus diminishes as the viewer reads their way through the bullet point list. Prezi brings the content to the center by zooming, it also removes other content on our canvas from view. As a result the viewer’s eyes are drawn to the center of the screen at each viewpoint, and are focused on one section of content at a time. The following tests were conducted using heat spots to indicate where the users' eyes focused when viewing a screen. The red color indicates more focus and time spent viewing a particular area; green areas show less focus. But why create scenes?
Does my data really need sceneography? If you like to focus on details, yes. Anti-Aging Elixir It is claimed that iFoods can slow down the aging process and prevent diseases related with aging. Discovered in 2006 Mikhail Shchepinov who works in biotech firm Retrotope, LA. The aim is to find a way to , only for medical purposes of course. slow down aging What are iFoods? How does it If the ROS are left unbalanced they can do significant damage to cell structures and biomolecules (e.g. DNA, proteins and lipids), by breaking the carbon-hydrogen bond. This can lead to the development of many diseases such as cancer, Parkinson's and even heart failure. but some isotopes are unstable Random thoughts.. Safe or strange? Half life is the amount of time it takes for an isotope to decay; by half half life facts Usefulness Varies Can be used to predict the length of time it takes for an element to decay. Cobalt-57 Carbon-14 Uranium-238 Examples Neptium-239
Plutonium-238
Thorium-229 random name Isotopes names linked to Gods? generator
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