High School Students’ Conceptions about Energy in Chemical Reactions (focusing only in exothermic and endothermic reactions). Aim The aim of this study is to investigate students’ understanding of the energy concept in chemical reactions particularly in endothermic-exothermic reactions. Both qualitative and quantitative methodology was used for this investigation. A twenty-item multiple choice test was developed about the topic to measure the students’ understandings. This concept test was
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9/13/12 Mr. McSwiggan SCALE CRJ 9/11 Reaction Paper This movie documented a horrific day in American history‚ September 11‚ 2001. It was a beautiful day in New York City clear sunny skies‚ until 9:47 A.M when the 1st hijacked and plane crashed into one of the World Trade Center Towers. At first people thought it might have been an accident; but‚ at 10:31 A.M‚ another hijacked plane struck the other tower. At this moment people realized this
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BACKGROUND PAPER ON A-10 THUNDERBOLT II “WARTHOG” 1. The purpose of this paper is to provide background information on the A-10 Thunderbolt II‚ including its mission and characteristics‚ current role‚ and future role in combat. The A-10 is designed around the seven-barrel Gatling gun‚ and can carry 16‚000 lbs. of mixed ordinance‚ making it a lethal asset in combat operations. In the current conflict‚ the A-10 is flying missions against the Islamic State in Iraq and Syria (ISIS). Military and
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unique visual effects. Mark Williams says employees from different backgrounds carry another kind of filter: A cultural lens shades the way they view race‚ nationality and ethnicity‚ as well as programs aimed at encouraging workplace diversity. In The 10 Lenses‚ Williams‚ founder and CEO of The Diversity Channel‚ a consulting firm in Bethesda‚ Md.‚ says it’s critical to recognize the existence of these filters. "As employees and managers learn to better understand their own lenses and the lenses of
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metals arranged in order of their reactivity based on displacement reactions‚ reduction of their oxides by hydrogen or carbon‚ the relative ease of decomposition of their compounds and reactions with oxygen‚ dilute acids and water. The higher up a metal is in the reactivity series‚ the more reactive it is. In the experiment conducted‚ the three metals‚ magnesium‚ zinc and copper each had to undergo displacement reactions and reactions with water‚ oxygen and dilute acids‚ to arrange them in the order
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Title Experiment 17 Reaction Kinetics- Determination of the Activation Energy of the Reaction Between Oxalic Acid and Potassium Permanganate. Objective To determine the activation energy of the reaction between oxalic acid and potassium permanganate. Theory and Background Activation energy is the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo chemical transformation or physical transport. In terms of the transition-state
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Coupled Reactions Louella Rose E. Tan‚ Frances May L. Coralde Institute of Chemistry‚ University of the Philippines‚ Diliman‚ Quezon City 1101 Philippines Results and Discussion A combustion reaction is a reaction that liberates heat and light. Magnesium is a stable element and reacts violently with evolution of much heat and light. The reason the magnesium burned in carbon dioxide was because it combined with the oxygen in the CO2 leaving elemental carbon behind. CO2(g) C(S) + O2(g)
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CHAPTER 10 – 14.1 REVIEW For each number‚ determine the type of inference‚ state the assumptions‚ and answer the questions. 1. A random survey of 57 students was conducted to compare juniors and seniors employment status. Seven out of 18 juniors held a job while 16 out of 39 seniors held a job. (a) Find and interpret a 98% confidence interval. (b) Is there evidence at the 1% significance level that more seniors have a job than juniors? If so‚ what might explain this
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Redox reactions (Redox terminology‚ galvanic cells‚ standard electrode potentials‚ strength of oxidizing/reducing agents‚ corrosion and protection against it) Oxidation is defined as the loss of electrons and reduction is defined as the gain of electrons. Oxidizing agents‚ such as oxygen are defined as substances which accept electrons; reducing agents are substances which donate electrons. Redox reactions are: a) The reactions of metals with non-metals 2Na+Cl2→2Na+Cl- b) The reactions
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REACTIONS OF HYDROCARBONS Vanessa P. Manibpel De La Salle University - Dasmariñas ABSTRACT Five substances namely Hexane‚ Eugenol‚ Unknown hydrocarbon 1‚ Unknown hydrocarbon 2‚ and Acetylene gas was used for the selective reactivity of hydrocarbons to functional group tests; Bayer’s test‚ Bromine test light‚ Bromine test dark‚ and Tollen’s test. In Bayer’s test‚ only Acetylene‚ Eugenol and Unknown hydrocarbon 2 reacted positively and the rest retain the purplish color of KMnO4. On the other hand
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