CBSE TEST PAPER-03 CLASS - X (Chemical Reactions and equations) 1. Take about 5 ml of dil. HCl in a test tube and add a few pieces of fine granules to it. Which gas is evolved? (a) Chlorine (b) Hydrogen (c) HCl (d) Nitrogen 2. Dissolving suger is an example of(a) Physical change (b) Chemical change (c) Redox Reaction (d) None of these. 3. Heat is evolved diving (a) Endothermic Reaction (b) Displacement Reaction (c) Combustion Reaction (d) Combination Reaction 4. Which of the following is not a balanced
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complex reactions and reaction sequences‚ where raw materials react together to give the product. Such chemical process often releases energy‚ in the form of heat‚ and the reaction is described as exothermic. Many of these reactions may also evolve gases at high rates‚ and could cause reactor over-pressure. Thermal runaway reaction Runaway reactions are thermally unstable reactions where the heat of reaction can raise the temperature of the reactants sufficiently to accelerate the reaction rate out
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people who were unfamiliar to them. By the late 15th century‚ Native Americans spread across the Americas in communities and also lived in flourishing civilizations‚ the Aztec and the Inca empire. There were around 100 million Native Americans‚ 25-30 million lived in the civilizations. The people in the Americas had wild game where they almost diminished the quantity by hunter-gatherer bands. Throughout North and South America‚ Native Americans farmed animals that were not traditional herd animals
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Elimination Reactions ________________________________________ As described previously‚ primary alkyl halides generally undergo substitution reactions with simple nucleophiles by an SN2 mechanism. Secondary alkyl halides‚ often react with simple basic nucleophiles to give a mixture of products arising from both substitution and elimination. As with substitution reactions‚ the rate at which elimination reactions proceed can be proportional to both the concentration of the base and the concentration
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United States of America‚ upon the tribes and cultures of Native Americans‚ through mass indoctrination of its youths. Primary support will be drawn from Jorge Noriega’s work‚ "American Indian Education in the United States." The paper will then culminate with my personal views on the subject‚ with ideas of if and how the United States might make reparations to its victims.<br> <br>In lieu of the well known and brutal "Indian Wars‚" there is a means of cultural destruction of Native Americans‚ which
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at St. George’s University Medical School. Cuban military was slowly funneling into Grenada and time was not on the US’s side. Reagan was 100% sure what he had to act hence the name Urgent Fury‚ the mission name for the Invasion of Grenada. “The major justification for the invasion was the protection of American lives.” Reagan wasn’t fully supported in following through with Urgent Fury primarily because there was very little intel of the area that the troops would be invading. The lack of scouting
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Polymerization reaCTIONS polymers are high-molecular-weight compounds‚ fashioned by the aggregation of many smaller molecules called monomers. Ex. plastics that have so changed society and the natural and synthetic fibers used in clothing are polymers. Classification of polymers Homopolymers - consist of repeated long chains or structures of the same monomer unit. Ex. PVC(polyvinyl chloride) Copolymers - polymers that consist of more than one molecule. Trimers - molecules consisting
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Abstract: This paper discusses the mathematics of the Native Americans inhabiting the vast lands north of present-day Mexico. The mathematical accomplishments of the Central and South American indigenous people are not a focus. The development of the number words‚ the recurrence of certain numerical themes in the art and architecture are noted. The paper presents the numbers and math as required to keep the records of cyclical time and possessions amassed in the cycle. Also discussed is the symbolic
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“Native American Religions” Native American Religions happen to be one of the oldest and most enduring forms of religion. They comprise a large number of distinct tribes‚ states‚ and ethnic groups. Native Americans arrived on the North American Continent fifth-teen thousand to twenty thousand years ago. Native Americans have literally sources that exist from only the last four hundred years even though Native American life covers perhaps twenty thousand years. Over three hundred tribes have
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ENGINEERING Reaction Engineering CGC035 / CGC052 Problem Sheet 3 - Fluid-fluid reactions 1. The reaction rate for the heterogeneous reaction A(g) + B(l)→ products is second order according to the expression -rA=kCACB and it is relatively slow compared to mass transfer so it takes place in the bulk of the liquid. Combine the following rate expressions for diffusion through the gas and liquid films‚ -rA=kAga(pA-pAi) and -rA=kAlaCAi-CA‚ with Henry’s law pAi=HACAi and the reaction rate
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