Before the discovery of gallium‚ its existence and properties were predicted by the Russian chemist Dmitri Mendeleev. He named the supposed element eka-aluminum as he predicted the element would be below aluminum in the periodic table of elements. In the year of 1875‚ the element Gallium was discovered by French chemist Paul E. Lecoq de Boisbaudran through a spectroscope in Paris. De Boisbaudran extracted gallium from a zinc blende ore from the Pyrenees and obtained .65 grams from 430 kilograms of
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– The relative atomic mass of an |elements. |HT – calculate Ar from provided data. | | | |element (Ar) compares the mass of the |Plenary: Atomic structure quiz on ppt. | | | | |element to 12C isotope. |
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I think reading is the most beneficial activities which human beings can do. Through the reading one can understand the enviroment which surrounds him‚ can discover inventions and can explain the miracle’s of the world. Many readings help you to be smarter. As proverb goes “Reading makes a full man‚ meditation a profoundmMan‚ discourse a clear man”. Reading is not just only information it is also relaxing. As Ricarde Steele said:”Reading is to the mind what exercise is to the body”. Is it really
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“mixt bodies”. In 1803 John Dalton developed the theory of atomism by conducting different experiments and he found out that each element is composed of different atoms to other elements. He also theorised that all the atoms in an element is identical and that compounds are made of two kinds of atoms combined together‚ which lead him to develop the idea that chemical reactions change the way atoms are grouped together. He also had a theory that atoms are in and could not be created nor destroyed
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proved that a chemical reaction had taken place. E) Yes‚ the law of definite proportions is valid‚ because most of the other groups that had not encountered as many errors as us and they had more accurate results which were closer to the predicted compositions according to the law. The rest had similar results to us which proves that their errors were similar to ours. H) The white film on the surface of the magnesium was polished because it prevents reactions of magnesium and gas elements in the air
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Alchemists were the first researchers to discover elements‚ however today their work has been put down as wrong and meaningless. It is an ingrained in our minds that alchemists believed that lead could be turned into gold and that earth was composed of only four elements‚ air‚ water‚ earth and fire. Alchemists were uneducated‚ but this in fact would be a negative image. They did not have to ability than to investigate the how’s and whys‚ and any chemical reaction was believed to be a magical phenomenon
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organic solvents and detergents which enable the oil to mix into the water. While this largely succeeded in getting the oil “out of sight‚ out of mind” by diluting it into a much larger volume of water below the surface‚ and helped increase of speed of chemical and bacterial breakdown of the oil somewhat‚ much of the oil is still there‚ just spread out more‚ and the dispersants themselves are also quite toxic. The full environmental damage of this spill and its “cleanup” will take years to
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Observations of Chemical Changes Experiment 1 Chemistry 111 September 3‚2014 Ashley Mattox Abstract: The purposes of this lab is to observe the reactions of some common chemicals contained in consumer products and observe the macroscopic changes these chemicals undergo. Purpose: The purpose of the lab is to be able to interpret underlying macroscopic changes in terms of the behavior of atoms and molecules and also to learn how to separate mixtures into their component
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Chemistry Laboratory Report Classification of Chemical Substances Student: Saule Sadykova Lab Partner #1: Temirlan Atambaev Lab Partner #2: Almas Ospanbekov Instructor: Eugene Douglass Nazarbayev University Purpose The aim of this experiment is to investigate the properties of several substances with the purpose of determining whether they are molecular‚ ionic‚ macromolecular or metallic. Introduction Chemical substances could be named ionic‚ molecular or metallic substance‚ based
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grow 3. Living things reproduce 4. Living things respond to stimuli 5. Living things use energy 6. Living things adapt to their environment A single celled organism‚ such as an Amoeba‚ has a short life because of the heavy work load and exposure to elements on all four of its sides. An Amoeba operates on one cell‚ so it is a lot of work and cannot get very big with just one cell. Any injury to the cell can result in immediate death to the fragile organism. Yet‚ it is still a life because it IS a cell
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