Chapter 1 * What is Chemistry? -it is the study of the composition of substances and the changes they undergo. * What are the 5 branches of chemistry? * Organic chemistry‚ inorganic chemistry‚ analytical chemistry‚ physical chemistry‚ biochemistry. * What is the difference between a theory and law? -a theory is a thoroughly tested explanation of why experiments give certain results. A scientific law is a concise statement that summarized the results of a broad spectrum of observations
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repel. 7. J.J Thomson: Cathode ray tube -Discovered and named the electron (e-) 8. Henri Bequerel: discovered that uranium is radioactive Radioactivity = spontaneous emission of radiant E from an element as its nucleus decays. Radioactivity does not come from stable elements. 9. Marrie & Pierre Curie: Discovered 2 radioactive element Po(polonium) and Ra (Radioactive) 10. Ernest Rutherford: British scientist who discovered 3 kinds of radioactivity. Alpha: 2 plus charge & heaviest/ 3 is the slowest
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professor at McGill University‚ Rutherford does his investigations into the disintegration of the elements‚ and the chemistry of radioactive substances that gets him to earn the Nobel Prize in Chemistry 1908. Rutherford ’s research‚ and work done under him as laboratory director‚ established the nuclear structure of the atom and the essential nature of radioactive decay. Radioactive decay is the process by which an atomic nucleus of an unstable atom loses energy by emitting ionizing particles. This emission
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Assignment 02/08/2010 The Process of Science a. Chapter 2: Question 11 How might you use a radioactive isotope to find out whether the oxygen in CO2 comes from sugar or oxygen gas? I would substitute with a radioactive isotope of oxygen and run the reaction. Upon observation of the result‚ the oxygen came from what was used if the carbon dioxide is radioactive. If the carbon dioxide is not radioactive‚ then it came from the sugar. b. Chapter 3: Question 11 What would you tell the food
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Test #3 Chapter 2: 1) What is matter? 2) What is mass? 3) Matter that has a uniform and definite composition is called a ______. Give an example. 4) A quality/condition of a substance that can be observed/measured without changing the substance is a ________ __________. Give examples. 5) What are the three states of matter? Put the correct state of matter in each box. 6) What is the difference between gas and vapor? 7) What is a physical change? Give an example. 8) A physical blend
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“Radiometric age-dating is based on the fact that every radioactive element decays. The original or “parent” element emits radiation and particles until the loss thereof transforms it into a stable “daughter” element. A series of transformations into other radio-active elements marks its unparalleled pattern and rate of decay until it reaches stability (Think Quest).” “The decay of radioactive elements occurs at different rates‚ depending on the specific isotope. These rates are stated in terms of half-lives
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elements after astatine. Francium is a highly radioactive metal that decays into astatine‚ radium and radon. As an alkali metal‚ it has one valence electron. Francium was discovered by Marguerite Perey in France (from which the element takes its name) in 1939. It was the last element discovered in nature‚ rather than being man made. Outside the laboratory‚ francium is very rare‚ with trace amounts found in uranium and thorium ores‚ where the isotope francium-223 continually forms and decays.
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chamber that is capable of detecting fairly low levels of radiation BACKGROUND OF THE STUDY Radon is a cancer-causing gas. It comes from the natural breakdown of uranium in soil‚ rock and water and gets into the air you breathe. These radioactive materials "decay" into lighter elements‚ emitting energetic sub-atomic particles in the process‚ and one of those lighter elements is Radon. Since radon is a noble gas‚ it is chemically inert and doesn ’t stay bound in the solid the way it ’s parent
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thousands of time greater than conventional battery sources. Hence‚ there is an urgent need to harvest enormous amount of energy released naturally by the tiny bits of radioactive material. Unlike conventional nuclear power generating devices‚ these batteries do not rely on the fission or fusion reactions and do not generate any radioactive material as by-product. They promise clean‚ safe‚ reliable and almost endless energy without any drop in its yield or efficiency during its entire life span-which
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tool in biochemical analysis. Therapeutic uses of radioisotopes cover from external gamma-ray sources in teleradiotherapy to direct cell irradiation in metabolic therapy. Radioisotopes can be use in medicine in four different ways. They are: 1. Radioactive tracers for diagnostic purposes 2. Radiation source in therapy 3. Research and 4. Sterilization The radioisotope therapy has been available to those disease conditions in which extensive cellular malfunction exists. Diagnostic radiopharmaceuticals are
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