Review Unit One – Biochemistry What is an isotope? Isotope - An isotope is all atoms of the same element that have the same number of protons‚ but they may have different numbers of neutrons in the nucleus. - This means that all atoms with the same atomic number can have different atomic masses. - Because they have the same number of protons and electrons‚ they behave exactly the same in chemical reactions. Radioisotope - The nuclei of some isotopes of an element are unstable and tend to break
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focus will be on the generation of electricity using nuclear energy in nuclear power plants as it is one of the main peaceful uses of nuclear energy. Electricity is generated using isotopes of certain atoms (elements). Although atoms are tiny‚ they have a large amount of energy holding their nuclei together. These isotopes can be split and will release part of their energy as heat. This splitting is called fission. A series of fissions is called a chain reaction. This chain reaction creates a great
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chemical and physical properties to that of silicon ( The Element). The element does not chemically react when introduced to air or water( The Element). Germanium is also unaffected by alkalis and acids except for nitric acid. It has 9 isotopes. Germanium isotopes are more often used for the production of medical As and Se radioisotopes. Ge-74 is used in the production for As-74‚ Ge-76 is used for the production of As-77‚ Ge-74 for the production of As-73 and Ge-72 for As-72 (Germanium Element)
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IMPORTANT QUESTIONS Physics · How much force is needed to accelerate a trolley of mass 20g through 1 m/s2. · A force of 100N acts on a mass of 25 kg for 5 s .What velocity does it generate? · A bullet leaves a rifle with a velocity of 100m/s and the rifle of mass 2.5 kg recoils with a velocity of 1m/s. find the mass of the bullet? · Certain force acting on a mass of 15kg for 3s‚ gives it a velocity of 2m/s. Find the magnitude of force. · A cricket ball of mass 0.15 kg is moving with
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occurred. Warm water conditions in the summer of 1997 resulted in a massive bloom of low energy coccolithophorid phytoplankton (Stockwell et al. 2001). A long record of carbon isotopes‚ which is reflective of primary production trends of the Bering Sea‚ exists from historical samples of bowhead whale baleen.[7] Trends in carbon isotope ratios in whale baleen samples suggest that a 30-40% decline in average seasonal primary productivity has occurred over the last 50 years.[7] The implication is that the
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Laura Speirs June 13‚ 2011 Professor Nalley Tungsten Paper Tungsten Tungsten is a gray-white metallic element that is stable and is very resistant to acids and bases. It does‚ however‚ oxidize in air‚ especially at higher temperatures Tungsten was discovered by Juan José and Fausto Elhuyar‚ Spanish chemists and brothers‚ in 1783 in samples of the mineral wolframite ((Fe‚ Mn)WO4). Tungsten was named from the Swedish words "tung sten" meaning "heavy stone." Tungsten ’s chemical symbol comes from
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Module 2 Mass Spectroscopy [pic] [pic] Diagram of a mass spectrometer Stage 1: Ionisation The sample is injected as a vapour and the atoms are bombarded by fast moving electrons. This causes the molecule to fragment into two or more pieces. When a molecule or part thereof fragments‚ one portion would be positively charged while the second portion will be uncharged. All uncharged fragments are ultimately lost in the machine as mass spectrometers only work with positive ions. Stage 2: Acceleration
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WJEC CBAC AS/A LEVEL GCE in Chemistry REVISION AID UNIT 1 AS UNIT CH1 – Controlling and Using Chemical Changes (in order to make things‚ produce energy and solve environmental problems) Preamble This unit begins with some important fundamental ideas about atoms and the use of the mole concept in calculations. Three key principles governing chemical change are then studied‚ viz. the position of equilibrium between reactants and products‚ the energy changes associated with a
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nitrogen – 16 3. All isotopes of technetium are radioactive‚ but they have widely varying half-lives. If an 800.0 g sample of technetium-99 decays to 100.0 g of technetium-99 in 639 000 yrs‚ what is its half-life? 800g/2 400g/2 200g/2 100g…3 half lives have passed 639‚000years/3 half lives = 213‚000 years half-life of technetium – 99 4. A 208 g sample of sodium-24 decays to 13.0 g of sodium-24 within 60.0 hrs. What is the half-life of this radioactive isotope? 208g/2 104g/2 52g/2
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HELİUM 3 As we know‚ helium is a lightweight and non-radioactive isotope of helium with two protons and one neutron. Also it sometimes called ‘tralphium’. According to many experts‚ helium-3 can be a clean nuclear power. There are many benefits of helium-3 but the most important problem is that there is very little helium-3 available on the Earth. First of all‚ I will give general some information about helium-3 isotope. Helium-3 | General | Name‚ symbol | Helium-3‚ 3He‚ He-3‚3He
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