Observations: Part I: Reaction between iron and oxygen Appearance of steel wool after 20 minutes From (relatively) shiny metal strips to not-so-shiny strips that are stained with dark‚ reddish-brown stuff. Part II: Decomposition of hydrogen peroxide Appearance of potato and hydrogen peroxide combination: Lots of white‚ foamy bubbles around the potato slices. Day 2 Observations: Part III: Reaction between zinc and acetic acid Appearance of penny in vinegar after
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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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Response to The Lost Tools of Learning Sayers believed the main problem with modern education is that children aren’t being taught to think. She believed that public education does not teach students how to understand relationships between subjects‚ nor does the public system teach students how to make sense of the information they learned. She was frustrated that adults cannot properly debate a question‚ write a lucid article in the newspaper or think for themselves when it comes to evaluating
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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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The Lost Children of Wilder "The Lost Children of Wilder" is a book about how the foster care system failed to give children of color the facilities that would help them lead a somewhat normal and protected life. The story of Shirley Wilder is a sad one once you find out what kind of life she had to live when she was a young girl. Having no mother and rejected by her father she has become a troubled girl. Shirley Wilder was rejected from foster care because she was black. The system failed
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Olive; the sublime resplendence of phosphorescence vaguely illuminated the lustrous crystals of quartz‚ deprived of impurities. Darkness; a description and depiction of the remnants of ancient civilization. I discovered myself amidst these‚ not knowing where to head‚ in a labyrinth of utmost quiescence‚ stranded with a compass which as neither a use nor an ornament for the ferric deposits in the surroundings refrain the needle from staying in an immobile position long enough for a reading of any
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Steven Spielberg’s films: Indiana Jones and the Raiders of the Lost Ark‚ ET (The Extraterrestrial)‚ Hook‚ and Jurassic Park. Like last years play‚ it was like an interview‚ and instead of E-Talk‚ it was based on Inside The Actor’s Studio‚ where the actors talk about their roles in their movie. Fun from the beginning to the end‚ these young actors are incredibly talented‚ and really brought their characters to life. Raiders of the Lost Ark was quite possibly the most dry play out of all the others
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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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My Reaction to Apollo 13 The movie Apollo13 is great but little kind of boring. Tom Hanks is a great artist! He is my idol. One of his great movie is Forrest Gump. By the way‚ The Apollo13 is America’s third moon landing mission. En route‚ an onboard explosion deprives their spacecraft of most of its oxygen supply and electric power‚ forcing NASA’s flight controllers to abort the Moon landing‚ and turning the mission into a struggle to get the three men home safely. I thought Jim’s wife was his
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