0.00031 | Yes (e.g. Zinc finger proteins) | 12 | 14 | Silicon | 0.002 | 0.0010 | 0.0058 | Yes (probable) | 14 | 37 | Rubidium | 0.00046 | 0.00068 | 0.000033 | No (?) | 1 | 38 | Strontium | 0.00046 | 0.00032 | 0.000033 | No (?) | 2 | 35 | Bromine | 0.00029 | 0.00026 | 0.000030 | No (?) | 17 | 82 | Lead | 0.00017 | 0.00012 | 0.0000045 | No (?) (toxic in higher amounts) | 14 | 29 | Copper | 0.0001 | 0.000072 | 0.0000104 | Yes (e.g. copper proteins) | 11 | 13 | Aluminium | 0.000087 | 0
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destruction of the stratospheric ozone is affected (Dobson‚ 2005). Despite this‚ an5thropogewnic causes are taken as the main causes of the depletion at the moment. It is believed that the natural phenomenon causes a temporary destruction but Chlorine and Bromine released as CFCs have more effects. These Chlorofluorocarbons cause effects that cannot be reversed they cannot mix with rain drops or be destroyed by other chemicals. Chlorofluorocarbons can survive in the air for 20 to 120 years causing more destruction
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Chemistry A Bonding Worksheet #1: Introduction to Ionic Bonds The forces that hold matter together are called chemical bonds. There are four major types of bonds. We need to learn in detail about these bonds and how they influence the properties of matter. The four major types of bonds are: I. Ionic Bonds III. Metallic Bonds II. Covalent Bonds IV. Intermolecular (van der Waals) forces Ionic Bonds The ionic bond is formed by the attraction between oppositely charged ions.
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Ngoc Pham Chem162B Lab #2: Trends in Periodic Table Date: 01/10/2011 Lab partner: Ian Bauer Result Section: Table I: The solubility of the alkaline earth metal ions | SO42- | CO32- | C2O42- | IO32- | Mg2+ | S | I | S | S | Ca2+ | I | S | S | I | Sr2+ | S | S | S | I | Ba2+ | I | I | I | S | Key: I- insoluble‚ S-soluble Table II: Color of water (Halide) and Halogen (Hexane) layers | Cl2 | Br2 | I2 | Hexane layer | Clear | orange | Pink | Water layer | Clear‚
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only those existing in or derived from plants or animals‚ but that now include all other compounds of carbon. This is the first thing that we need to understand. The fact that organic compounds contain carbon and are also combined with nitrogen‚ bromine‚ hydrogen. Sulfur‚ and chlorine and that the majority of the compounds found and tested in crime scene labs are going to be organic. The organic trace evidence that is found at crime scenes is going to be fluids. Fluids that can be left at a crime
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DryLab - III 1. What experimental evidence leads scientist to believe that only quantized electron energy states exist in atoms Answer The evidence was the Niels Bohr experiment on Hydrogen gas that established a quantized model for electron orbits in atoms that effectively explained the spectroscopic behavior of the atoms. 2. a. what is the wavelength ranges of the visible spectrum for electromagnetic radiation Answer The ranges of visible spectrum for human eye is between 390 to 700nm
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Alkyl Halides Alkyl halides are a class of compounds where a halogen atom or atoms are bound to an sp3 orbital of an alkyl group. CHCl3 (Chloroform: organic solvent) CF2Cl2 (Freon-12: refrigerant CFC) CF3CHClBr (Halothane: anesthetic) Halogen atoms are more electronegative than carbon atoms‚ and so the C-Hal bond is polarized. H H μ C + C-l δ δ H The C-X bond is polarized in such a way that there is partial positive charge on the carbon and partial negative charge on the halogen. Dipole moment
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has to do with the outermost electron shells. Halogens are reactive because they only have seven electrons in their outermost shell and can gain another by reacting with atoms of other elements. A few examples of halogens are: fluorine‚ chlorine‚ bromine‚ iodine‚ and astatine. On the other hand alkali metals are extremely reactive because instead of gaining another electron like the halogens‚ alkali metals lose one or two electrons. Some examples of alkali metals are: lithium‚ sodium‚ potassium‚ rubidium
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The Periodic Table Notes History of the Periodic Table * Two main contributors * Dmitri Mendeleev * Henry Moseley Dmitri Mendeleev – Russian * 1869: published his periodic table with the 63 known elements * Arranged the first periodic table in order of increasing atomic masses Henry Moseley – British * 1913 revised Mendeleev’s periodic table * Today’s periodic table * Arranged in order of increasing atomic numbers What is the difference between Mendeleev’s
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1. SURFACE RUNOFF INTRODUCTION: Runoff means the draining or flowing off of precipitation from a catchment area through a surface channel enters into a stream channel. It is convenient to visualize three main routes of travel; overland flow (air hujan limpahanpermukaan)‚ interflow‚ and ground water flow (air dari punca bawah tanah). 1 Runoff results from rainfall occurrence in a hydrologic catchment. Rainfall-runoff relations are Interflow/subsurface and base flow/groundwater flow
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