Ozone depletion Ozone depletion describes two distinct but related phenomena observed since the late 1970s: a steady decline of about 4% per decade in the total volume of ozone in Earth’sstratosphere (the ozone layer)‚ and a much larger springtime decrease in stratospheric ozone over Earth’s polar regions. The latter phenomenon is referred to as the ozone hole. In addition to these well-known stratospheric phenomena‚ there are also springtime polar tropospheric ozone depletion events. The details
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ENVIROMENTAL PROBLEMS. Nowadays one of the biggest problems which all human beings are facing is an environmental problem. Animals are dying and people are worried about forests destruction and ozone depletion. A lot of people come with new ideas to stop environmental pollutions everyday. However‚ none of those ideas have worked out yet and the environment is becoming worse and worse every day. I have some suggestions that I believe would be useful in this situation. The
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coefficient for Ca2 +? Ca2 + + PO4 3 + → Ca2(PO4)2 6) _______ A) 4 B) 1 C) 3 D) 2 7) Which molecule contains a bent geometry? 7) _______ A) HF B) OF2 C) CO3 2 + D) SiO2 8) Which element has properties most similar to Bromine? 8) _______ A) F B) Kr C) S D) Se 9) Which of the following has the most electrons? 9) _______ A) Sr2 + B) Rb C) Cl - D) Kr 10) Which bond is most polar? 10) ______ A) N -H B) C -H C) O -H D) H -H 11) Which of the following
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the ice bath 5 min. After removing the flask from the ice bath and placing a watch glass over the opening‚ allow the reaction mixture to come to room temperature over 15 minutes. Place the reaction flask into the ice bath and quench the unreacted bromine by addition of both 5 mL of sodium thiosulfate solution (1 g/5 mL) and 5 mL sodium hydroxide solution(1 g/5 mL ); collect the product by suction filtration. Recrystalllize the brominated product from a minimum amount of solvent. You will need to select
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In our hypothesis we predicted that the enzymes in the pineapple will denature when the temperature is changed. The prediction was partly correct. Pineapples have special enzymes that denature gelatin molecules. Which is the reason why the pineapple and gelatin test tube remained filled with liquid‚ instead of turning into jelly which gelatin does when it’s molecules are not disturbed. Why our hypothesis was partly incorrect was lacked depth in that when changing the temperature by heating the pineapple
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valence electron: calcium or potassium? 15. Doesn’t react with sodium: chlorine or xenon? 16. A metal used in jewelry: sodium or rhodium? 17. Isolated by Madame Curie: radium or rhenium? 18. Its crystals sublime as violet gas: iodine or bromine? 19. Holds its electrons less tightly: copper or gold? 20. One of the two densest metals: osmium or magnesium? 21. Used to disinfect water: boron or chlorine? 22. Compounds of this are used in toothpaste: lithium or fluorine? 23. Named
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FOUNDATION IN SCIENCE INTRODUCTION TO PRACTICAL ORGANIC CHEMISTRY – MAKING AND PURIFYING ORGANIC COMPOUNDS Stage 1 – Deciding how much reagent to use Most organic reactions do not go to completion; most reach an equilibrium position with significant quantities of reactants still remaining. In addition‚ separating the desired product from the rest of the reaction mixture‚ and then purifying it‚ will result in the loss of more of the product. The amount of product obtained expressed as a percentage
Free Distillation Sulfuric acid Acetic acid
Lab 22: 4-Methylcyclohexene Abstract: We treated 4-methylcyclohexanol with phosphoric acid‚ and after purification we produced the end product 4-methylcyclohexene. We determined we had a pure product based on the results of the tests with Br2 and KMnO4‚ as well as the IR absorbtion spectrum of the final product. Purpose: The purpose of this experiment is to obtain pure 4-methylcyclohexene by reacting 4-methylcyclohexanol and phosphoric acid. Through distillation
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Paradise Creacion Special Finishes For Textiles Paradise Creacion Special Finishes or functional finish are the treatments that are applied to the fabric to make them suited for specific uses. Paradise/Creacion is offering the auxiliaries for following treatments • • • • • • Easy Care Finish Flame Retardant Finish Water Repellent Finish Soil Release Finish Hydrophilic Finish Anti Bacterial Finish. Paradise Easy Care Finish Creacion It is an acknowledged fact that
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CSEC CHEMISTRY NOTES ON PERIODIC TRENDS From Chemistry for CSEC by Tania Chung-Harris and Mike Taylor Chemistry for CAPE by Susan Maraj and Arnold Samai Periodic Trends in Group II Elements in Group II The elements in Group II are called alkaline earth metals. Be‚ Mg‚ Ca‚ Sr‚ Ba‚ Ra Beryllium‚ Magnesium‚ Calcium‚ Strontium‚ Barium‚ Radium These elements bond by metallic bonds (intramolecular forces) to form giant metallic structures. The size of the
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