Health effects of tobacco From Wikipedia‚ the free encyclopedia Part of a series on Tobacco HISTORY History of tobacco BIOLOGY Nicotiana (Nicotiana tabacum) Nicotine Tobacco diseases Types of tobacco SOCIAL IMPACT Health effects Prevalence of consumption Tobacco advertising Tobacco and art Tobacco and other drugs Tobacco control Tobacco politics Tobacco smoking Tobacconist PRODUCTION Cultivation of tobacco Curing of tobacco Tobacco industry Tobacco products v t
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------------------------------------------------- Antoine Henri Becquerel (15 December 1852 – 25 August 1908) was a French physicist‚ Nobel laureate‚ and the discoverer of radioactivity along with Marie Skłodowska-Curie and Pierre Curie‚[1] for which all three won the 1903 Nobel Prize in Physics. Biography [edit]Early life Becquerel was born in Paris into a family which produced four generations of scientists: Becquerel ’s grandfather (Antoine César Becquerel)‚ father (Alexandre-Edmond Becquerel)
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Abstract Ernest Rutherford’s Gold Foil Experiment was a major stepping stone one the way to discovering what the atom was really made up of. From the beginning of his research with alpha particles to his discovery of the atomic nucleus‚ Rutherford made many contributions to the microscopic world of the atom. The Rutherford Experiment‚ otherwise known as the Gold Foil Experiment‚ was the crown of his achievements‚ and it was during this experiment that he discovered the atomic nucleus. (Aydin &Hanuscin
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Abstract This paper discusses radon gas‚ which is produced as a byproduct of the natural decomposition of uranium in rocks‚ soil‚ and water. Gas build-up in enclosed dwellings such as houses‚ apartment and office buildings‚ factories‚ and schools is a major concern in many parts of the country. Human exposure to high concentrations of this gas for extended periods of time can be extremely damaging to health. Lung cancer has the highest mortality rate of any cancer‚ and it is estimated that 15%
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SCH4U-C 1 UNIT Structure and Properties of Matter Unit 1 Introduction Chemisty SCH4U-C Table of Contents Unit 1: Structure and Properties of Matter Lesson 1: Atomic Structure Lesson 2: Introduction to Chemical Bonding Lesson 3: Molecular Shape and Polarity Lesson 4: Intermolecular Forces and Their Applications Unit 2: Organic Chemistry Lesson 5: Saturated Hydrocarbons Lesson 6: Unsaturated Hydrocarbons Lesson 7: Functional Groups Lesson 8: Acids‚ Esters‚ Amides
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since it isn ’t chemically active or electrically charged. But radon has a short half-life of only about four days‚ meaning that about half of it will decay within four days‚ producing new‚ even lighter radioactive isotopes of other elements like polonium‚ lead‚ and bismuth. Those isotopes keep decaying‚ until a stable isotope of lead is reached. These radon "daughters" are not noble gasses like radon‚ they are usually ionized when they are produced‚ and they will readily stick to anything nearby
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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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ABSTRACT The short and unpredictable nature of the conventional chemical batteries‚ along with the frequent replacements that they require‚ has created an acute need for a reliable‚ longer-lasting and rugged source of energy. Moreover Radars‚ spacecrafts‚ interstellar probes and other advanced communication devices require much larger power than that can be met by conventional energy sources. The solution to long term energy source is the nuclear powered batteries which have a life span of few
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------------------------------------------------- 1.Top of Form Arrange the following elements in order of increasing electronegativity: germanium‚ bromine‚ selenium‚ arsenic Please answer this question according to the general rules you have learned regarding periodic trends. DO NOT base your answer on tabulated values since exceptions may occur. | germanium smallest arsenic selenium bromine largest Feedback: Electronegativity is the ability of an atom in a molecule to attract
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C A L I F O R N I A S TA N DA R D S T E S T Chemistry Released Test Questions Question Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 Correct Answer A A C A B D A A A B A A C D A A C D B D D C A C A C D A D A C A B D A Standard CHIE1.A CHIE1.A CHIE1.C CHIE1.D CHIE1.E CHIE1.F CHIE1.F CHIE1.G CHIE1.K CH1.A CH1.A CH1.A CH1.B CH1.B CH1.C CH1.C CH1
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