Calcium Calcium is present in fly ash in multiple modes of occurrence‚ primarily lime‚ anhydrite‚ calcite and within the glassy matrix. It is the most largely released cation (Kim et al.‚ 2003). In the present column experiment‚ leached concentration of calcium was recorded as 50 ppm at 10th day of experiment. At 20th day of experiment‚ calcium concentration in leachate was found as 120 ppm. While at 30th day of experiment‚ calcium concentration in leachate was 280 ppm and at 45th day it was 450
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Non-Flammable | Crystal structure | * Explanation bellow‚ after main. | Other names | * Silica‚ Quartz | The chemical compound silicon dioxide‚ also known as silica (from the Latin silex)‚ is an oxide of silicon with a chemical formula of SiO2 and has been known for its hardness for centuries. Silica is most commonly found in nature as sand or quartz‚ as well as in the cell walls of diatoms. Silica is the riches mineral in the Earth’s crust. The crystal structure of Silicon Dioxide changes
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Reaction mechanism of tert-butylation of phenol with tert-butyl alcohol over H-beta zeolite: An ONIOM study | 作者: Nie‚ XW (Nie‚ Xiaowa)1‚3‚4; Janik‚ MJ (Janik‚ Michael J.)2; Guo‚ XW (Guo‚ Xinwen)1; Liu‚ X (Liu‚ Xin)1; Song‚ CS (Song‚ Chunshan)1‚2‚3‚4 | 来源出版物: CATALYSIS TODAY 卷: 165 期: 1 页: 120-128 DOI: 10.1016/j.cattod.2010.11.070 出版年: MAY 16 2011 | 被引频次: 2 (来自 Web of Science) | 引用的参考文献: 50 [ 查看 Related Records ] 引证关系图 | 摘要: Tert-butylation of phenol with tert-butyl alcohol
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Electrophilic Aromatic Substitution Objective The objective of this experiment was to illustrate electrophilic aromatic substitution by synthesizing p-nitroanilide (as well as ortho) from acetanilide by nitration. The para form was separated from the ortho form based on solubility properties using recrystallization techniques. Synthetic equations: Physical Properties & Hazards of Reagents/Products: (all taken from Sigma-Aldrich website) Acetanilide MM = 135.16 g/mol Melting point =
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The Fiber Optic Technology By: Juan C. Zapata MGMT 221 Introduction to Management Information Systems Professor: John Khayata Embry Riddle University September 20‚ 2011 TABLE OF CONTENTS: I. ABSTRACT II. HISTORY OF FIBER OPTICS III. HOW FIBER OPTICS WORK IV. ADVANTAGES OF OPTICAL FIBERS V. DIGITAL ENCODING VI. TRANS-OCEANIC CABLES VII. CONCLUSION
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True If a solution remains unsaturated‚ mineral crystals may precipitate False Magma is often a slushy mix of molten rock‚ gases‚ and minerals crystals True The elements found in magma are quite different from those found in Earth’s crust False Silica is the most abundant command found in magma True Magmas are classified as basalt‚ andesitic‚ or rhyolitie True In the laboratory‚ rocks must be heated from 8000 C to 12‚000 C before they melt False Heat in the upper mantle and lower crust may
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samples of soil plus the Soil as control sample‚ each sample of these three will be divided into two‚ one of these two parts will be added to silica fume‚ and the second one will be added to lime‚ and then the comparison will be between those seven samples depending on the properties. The two chemicals‚ which will be added to the soil in this research‚ are Silica Fume and Lime. Soil that will be used for this study is disturbed soil and will be defined exactly in chapter four. The basic physical tests
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as? -Crystal Fractionation 8. Which of the following atoms has a net charge of negative one? -5 protons and 6 electrons 9. The most common mineral or mineral group in the Earth’s crust is? -Feldspar 10. Felsic rocks are? -Have higher silica content than mafic rocks 11. Polymorphs are? -Minerals with the same chemical composition 12. The basic constituents of all matter are? - Atoms 13. The most common elements in Earth’s crust in terms of weight are? -Oxygen (O) and Silicon
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volcanoes is by the composition of material erupted (lava)‚ since this affects the shape of the volcano. Lava can be broadly classified into 4 different compositions (Cas & Wright‚ 1987): * If the erupted magma contains a high percentage (>63%) of silica‚ the lava is called felsic. * Felsic lavas (dacites or rhyolites) tend to be highly viscous (not very fluid) and are erupted as domes or short‚ stubby flows. Viscous lavas tend to formstratovolcanoes or lava domes. Lassen Peak in California
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Unfavorable environmental conditions may induce flowering plants to reproduce by clonal growth more frequently than sexual reproduction‚ and such environmental conditions can be temporary or long lasting (HONNAY and BOSSUYT‚ 2005). A plant species can form remnant population when stages of the life-cycle persist over time due the failure to complete the whole life cycle (Eriksson 2000). These remnant populations may play an important ecological role for ecosystem resilience‚ due to positive interactions
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