A chemical that is used every day by almost every person around the world is ethylene glycol. Many people know this chemical by its common name of antifreeze‚ but it is also used as a solvent and in hydraulic brake fluids. This liquid chemical is clear and colorless with primary threats to the environment through penetrations of soil and groundwater systems. Ethylene glycol can also cause acute and chronic health problems if exposed to. (Ethylene Glycol) There are three main routes of exposure
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abundance of chemical elements in rocks and soils on Mars. 4. it has a melting point of 1340°C Curium was identified by Glenn Seaborg‚ Ralph James and Albert Ghiorso in 1944 at the wartime metallurgical laboratory at the University of Chicago. Its production was the result of helium-ion bombardment of Plutonium-239 in the Berkeley‚ Calif.‚ 60-inch cyclotron. Although curium follows americium in the periodic system‚ it was actually the third synthetically produced transuranium element to be discovered
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studying the atomic theory to come up with an improved atomic theory and “The Raisin Bun Theory.” Thomson’s atomic theory was that “matter is composed of atoms that contain electrons (negative particles) embedded in a positive material. The kind of element is characterized by the number of electrons in the atom.” Dalton is known as the one who developed the atomic theory and although some of his theories are proved false today‚ his “pioneer work” helped many chemists further his studies. Dalton is also
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Civilizations‚ the substances of emerald and beryl were first recognized as the same substances. but in late 1798‚ French chemist Louis-Nicholas Vauquelin found out that the unknown element in the two substances was known as beryllium. Beryllium is obtained from the substances beryl and bertrandite by using chemical processes.(1) The first metal form was produced by Wohler and Bussy in 1828. They obtained the beryllium in an impure powder form by reducing beryllium chloride with metallic potassium
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horizontal rows of the periodic table are called a. triads. b. elements. c. periods. d. groups. 5) Gaseous elements characterized by low reactivity are found in group ________ of the periodic table. a. 7A b. 8A c. 5A d. 6A 6) Which subatomic particle has the smallest mass? a. a proton b. a neutron c. an alpha particle d. an electron 7) What group of elements does the shaded area in the following periodic table indicate? a
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Getting To Know the Periodic Table Objectiv0e: To be able to use the periodic table to identify and classify elements and to use the periodic table to predict the behavior of elements Procedure: 1. Number the groups. 2. Number the periods 3. Draw a heavy black line between the metals and nonmetals. 4. Write the name of each of the following groups above the number: Group 1 alkali metals Group 2 alkaline earth metal Group 3-12 (collectively) transition metals Group 16 chalcogens
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32 48 13 32 48 14 32 48 Ratio: 48:32=6:4=3:2=1.5 Conclusion: Answer the following questions in complete sentences‚ giving detailed explanations and support for each of your answers. 1. Explain in your own words what it means for a chemical system to be in the state of dynamic equilibrium. After a reaction has occurred for awhile at a given temperature‚ the forward and reverse reaction rate will eventually be equal. Although you may get this confused‚ the concentration may not be
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Chemistry: A Molecular Approach (Tro) Chapter 10 Chemical Bonding II: Molecular Shapes‚ Valance Bond Theory‚ and Molecular Orbital Theory 1) Determine the electron geometry (eg) and molecular geometry(mg) of BCl3. A) eg=trigonal planar‚ mg=trigonal planar B) eg=tetrahedral‚ mg=trigonal planar C) eg=tetrahedral‚ mg=trigonal pyramidal D) eg=trigonal planar‚ mg=bent E) eg=trigonal bipyramidal‚ mg= trigonal bipyramidal Answer: A 2) Determine
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Chemistry: Atom structure theories Scientific research is a multistage and complicated process which requires many creative minds to contribute into its creation in order to be efficacious and present solid results. I’ve been given an information sheet apprising ideas of four scientists whose work was very significant in creating the theory about atom structure we recognise nowadays. Guiding Questions: 1 What significant contribution did each of the following people make to present ideas about the
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Chemical equilibrium is the point at which the concentrations of reactants and products do not change with time. It would appear as if the reaction has stopped‚ but in fact‚ the rates of the forward and reverse reactions are equal‚ causing the reactants and products to be created at the same rate. This can be expressed mathematically in the form of the equilibrium constant. The following is the general equation for a reversible chemical reaction: aA+bB →cC+dD
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