metals. Table 1.2 Typical shrinkage allowances for important casting metals Type of metal Amount of shrinkage (%) Grey cast irons 0.55-1.00 White cast irons 2.10 Malleable cast irons 1.00 Steels 2.00 Manganese steel 2.60 Magnesium 1.80 Type of metal Zinc Brasses Bronzes Aluminium Aluminium alloys Tin Amount of shrinkage (%) 2.60 1.30-1.55 1.05-2.10 1.65 1.30-1.60 2.00 In practice‚ pattern makers use a special rule or scale‚ called the “pattern maker’s contraction rule”‚ which‚ after providing with
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Introduction Reactions don’t always produce the same product‚ even if the reactants are kept constant. Some reactions have the capacity to produce two or more different products‚ depending on the reaction conditions and control such as thermodynamic and kinetic control. Thermodynamic control produces more stable products (University of Windsor‚ 2015). A kinetic control forms products at a faster rate faster rate because of its lower activation energy (UC Davis ChemWiki‚ 2015). By manipulating these
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In the experiment‚ synthesis of copper compounds‚ the purpose was to recover the original amount of copper after series of chemical reactions. Then returning the copper back to its original form. The copper wire originally weighted 1.0099 g‚ but after the copper was transformed into Cu(OH)2 to CuO to CuSO4 and finally into Cu‚ the mass of the recovered copper was 1.1023g; the percent yield was 109%. Since the percent yield is more than 100%‚ an error must have occurred somewhere in the lab. A possible
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?SOLUTIONS TO CLIMATE CHANGE IN ALASKA? Scientists believe that a decrease of between 65% and 80% of carbon dioxide emissions is necessary to prevent the effects of global warming (?Carbon Dioxide?) and government taking actions to find solutions in Alaska. To create awareness the government has released new climate data‚ tools‚ and mapping of Alaska that will assist them to understand and prepare for future climate change (Wuebbles and Jain 2001 p. 99-102). Permafrost has been a major problem in
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Divya Nagendran Professor Patrick Crawford CHEM 122-04 27 January The Role of Zinc in My Life Chemistry plays a vital role in our daily life. We find chemistry in every object we see or touch. We could find chemistry in the food we eat‚ the air we breathe‚ our acne treatment cream and the list goes on. There is one chemistry element that is important in my daily life and its Zinc or Zn 2+. During my high school year‚ I’ve had problems with hair loss. Each day I would lose 100 to 125 strands
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Institutional Research Hindustan Zinc Ltd. Silver takes the “Lead”… Kunal Motishaw +91 22 663 99138 VIOLET ARCH Securities Pvt. Ltd. (Erstwhile Alchemy Share & Stock Brokers Pvt. Ltd.) kunal.motishaw@violetarch.com VIOLET ARCH Research Index Scenario Analysis Key Assumptions Sensitivity Analysis SWOT Analysis Investment Arguments Key Risks and Concerns Valuation Comparative Valuation Key Investment Argument Comprehensive List of Risks and Concerns Background Zinc Outlook Key Financial Analysis
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Chapter 1 Chemical Reactions and Equations Q.1. Why should magnesium ribbon be cleaned before burning in air ? Ans: Magnesium ribbon is a very reactive metal. When stored it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide being a stable compound prevents further reaction of magnesium with oxygen. The magnesium is cleaned before burning in air to remove this layer so that the metal can be exposed to air properly. Q.2. Write the balanced
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PREPARATION OF ALUMINA POWDERS 1. BAYERS PROCESS INTRODUCTION The Bayer Process was invented and patented in 1887 by Austrian scientist Karl Josef Bayer. Two to three tonnes of bauxite are required to produce one tonne of alumina. 90% of the global alumina supply of around 90 million tonnes is used in aluminium production. DEFINITION The Bayer process is the principal industrial means of refining bauxite to produce alumina (aluminium oxide). The aluminium oxide must be purified before it
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corrosion for a much longer period of time. Powder coating is different from painting. There are no liquids or solvents. Therefore‚ it is the ultimate coating for environmental friendliness. Being dry‚ the powder overspray can be reclaimed for very high application efficiency. It uses heat to convert its state from a powder to a continuous film. The powder coating materials are basically plastics that have been ground into a fine powder. The coating powder is formulated with plastic resins‚ pigments
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Essay on enzymes Biological washing powder Hee-Jun Park 8B We have used enzymes over many years to make many clothing and also foods or drinks‚ such as‚ drinks‚ bread‚ cheese‚ beer and wine. Even though‚ the first person that realized how to make these noticed nothing about enzymes. There are many types of enzymes existing to help our industrial life. And the difference of each enzyme is for us to do different things. The use of enzyme in industry has become very central in the modern domain. Enzymes
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