Chemical Reactions Chemical Change • reorganization • original substances form new substances with different formulas • may or may not involve a change of state • symbols used to describe chemical reaction are known as a chemical equation • Chemical equations do not have equal signs (=) they have an arrow Chemical Equations • Must follow the Law of Conservation of Matter • atoms can neither be created or destroyed during a chemical reaction • What
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One of the darkest moments of the worlds’ history took place between 1941-1945. The Holocaust‚ as it is referred to‚ was the mass murder or genocide of millions of people. The responsible party‚ The Nazi Regime‚ was a dictatorship out of Germany headed by their notorious leader‚ Adolf Hitler. The group targeted Jewish people and persecuted groups‚ such as gypsies and homosexuals. Hitler justified these actions because he felt the Jewish people were a lower class compared to the German people. Under
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A REACTION PAPER ON THE TALKSHOW STRAIGHT FROM THE HEART YEAR 2 VALUES EDUCATION S.Y. 2012-2013 I. Introduction: This year‚ is the year 2 of the said talk show in which the Holy Name University High School Department were preparing. The title of the talk show was STRAIGHT FROM THE HEART YEAR 2. Of course‚ the talk show can’t be done without our handsome and beautiful guests. The 1st guest was our own Fr. Ruel Lero. The 2nd guest was the wife of Gov. Edgar Chatto‚ Mrs. Pureza Chatto‚ the
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RATE OF REACTIONS. The reaction rate (rate of reaction) or speed of reaction for a reactant or product in a particular reaction is intuitively defined as how fast or slow a reaction takes place. For example‚ the oxidative rusting of iron under the atmosphere is a slow reaction that can take many years‚ but the combustion of cellulose in a fire is a reaction that takes place in fractions of a second (right). Chemical kinetics is the part of physical chemistry that studies reaction rates. The concepts
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Media Reaction SOC/315 July 10‚ 2014 Introduction Immigration issues are not only in the United States and are as different as our cultures and the ways that they affect our people. Media reaction show some shared political and public views‚ however there are some factual information that may alter the views of its audience. To help address some questions about the Medias reactions concerning immigration‚ we will use the media piece from the website: Los Angeles Time Politics
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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 experiment is to study the effect of temperature on the rate of reaction between potassium permanganate with oxalic acid. We used 2cm3 of 0.02M potassium permanganate and 4cm3 of 1M sulphuric acid into a test tube. In another test tube‚ we placed 2cm3 of oxalic acid. We placed the test tubes in a water bath at 40‚ 45‚ 50‚ 55 and 60oC respectively. When the solutions have attained these temperatures pour the oxalic acid into the acidified permanganate solution and recorded the time
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Lab #4: Aqueous Reactions Introduction: In this experiment we studied the two different types of aqueous chemical reactions‚ double replacement and single replacement. In a double replacement reaction one or both of the products is an insoluble ionic compound or otherwise known as a precipitate; or a non-electrolyte; or a gas. In a single replacement reaction there is typically a metal and an ionic compound consisting of a metal cation and a non-meatl anion. Singel replacement ractions occur when
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rate of reaction (mol dm-3 s-1) for the following chemical reaction: CaCO3(s) + HCl(aq) CaCl2(s) + H2O(l) + CO2(g) Research question: How does altering concentration (mol dm-3) of hydrochloric acid (HCl) affect the rate of reaction (g/s) for the following reaction: CaCO3(s) + HCl(aq) CaCl2(s) + H2O(l) + CO2(g) Background information: The reaction between calcium carbonate and hydrochloric acid is an example of a neutralization reaction between an acid and a base. Neutralization reactions involve
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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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