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Free Chemical element Essays and Papers

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    Chemical Changes

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    physical change, its shape changes but the energy inside the can did not change meaning it couldn’t be a chemical change. Chemical changes happen on a very small scale and can happen over a period of time. Chemical changes are a change that forms a new chemical substance. A chemical changes is the breaking or joining of bonds and atoms. Iron rusting, gasoline burning, and milk souring are all chemical changes because new substances are formed. Boiling water, dissolving sugar, and dicing potatoes are

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    My Career In Chemistry

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    universe; living or non-living. Everything is made of elements which are made up of atoms of a certain atomic number. Thereafter I took AP Chemistry, I knew I had to choose a career in the field of chemistry. I understand and enjoy learning about chemistry. Chemistry is important, interesting, and ever expanding. Therefore, I must pursue a career in Chemistry. Having a degree in chemistry opens the door to a wide array of careers. These jobs include chemical engineer, analytical chemist, and pharmacologist

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    Chemistry: The Oxygen Family

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    oxygen and oxides are often separated from chalcogens because its chemical behavior is much different than that of the other elements in the group. The other elements in the group show similar patterns in their electron configurations resulting in similar chemical behavior. The name chalcogen means "ore former," derived from the Greek words chalcos: ore and -gen: formation. An interesting fact is that oxygen is the most abundant element on Earth, second most in the Atmosphere, and third in the whole

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    2. What was phlogiston? Based on what theoretical and experimental bases did Lavoisier reject it? According to Bowler’s Making Modern Science, A Historical Survey, the theory of phlogiston was first stated by Johann Joachim Becher in 1667. In 1703, Georg Ernst Stahl, a professor of medicine and chemistry at Halle, proposed a variant of the theory in which he renamed Becher’s terra pinguis to phlogiston theory and it was in this form that the theory had it influence. Phlogiston was a fire-like substance

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    Krypton Essay

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    Krypton is a very cool element, I mean come on it forms a hard crystal called “kryptonite” that hurts superman and could possibly kill him. As you read this essay it will discuss the discovery of the element, what it looks like, the common uses of it and where it is commonly found, why my element is interesting, and how the people who read this essay will remember the element Krypton. First it will discuss, the discovery of the element. The discovery of the element Krypton is quite interesting. Two

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    Atomic Structure, Moles and Periodicity

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    Atomic structure, Moles and Periodicity The Periodic Table is guidance or map to access different elements specific information, such as: atomic mass, isotopic richness, nuclear spins, electronic configuration and the position of elements belong to which group and period in table. Over the past decades there were many Scientifics which help to improvement of Periodic table but few of them made the most influence and contribution on Periodic table such as : Johann Dobereiner ,John Newlands ,

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    History of Chemistry

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    Structures, he would most likely be confused. Before Chemistry was founded, people were still very interested with elements. In fact some of our time periods are named after elements such as the Bronze Age and the Iron Age. Early humans used the metals as tools and weapons for everyday purposes but that’s about it because our technology wasn’t fully prepared. Prior to the knowledge of the many elements on this earth, life was pretty hard on earth with so little, now flash forward to the creation of a whole

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    components of nutrients relate to the body by distributing chemical components to all body organs. There are major, minor and trace elements in the body. The major elements of the body are carbon, hydrogen, oxygen, phosphors, calcium and nitrogen. The minor elements are chlorine, potassium, sodium, magnesium and sulfur. One example of a trace element is fluorine, any many more that come in even smaller amounts. The most important abundant chemical is water. Water makes up about 90% of all human cells

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    1). He wrote the first extensive list of elements containing 33 elements and distinguished metals and non-metals (source 5). Him and his area of work were particularly interested in compounds, element weight and chemical reaction (source 6). Dimitri Mendeleev arranged 63 known elements, into the periodic table based on atomic mass and predicted the existence and properties of new elements. He realised that the physical and chemical properties of elements were related to their atomic mass and arranged

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    many people had to face problems with water because water was very limited to people. In addition, the underground water they get was very unsafe, which caused so many illnesses in the villages because of adding extra chemical elements in it. People won’t stop adding chemical elements in the water because they are having the profit in it, which is making so hard for them to give up, which later becomes a challenge for others to protect the environment. Furthermore, it is very difficult to protect the

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